![Linus Walleij](/assets/img/avatar_default.png)
In commit3d838118c6
("iio: pressure: bmp280: add power management") For some reason the code in the runtime suspend/resume hooks got wrong (I suspect in the ambition to cut down boilerplate) and it seems it was tested without CONFIG_PM and crashes like so for me: Unable to handle kernel NULL pointer dereference at virtual address 0000000c pgd = c0204000 [0000000c] *pgd=00000000 Internal error: Oops: 5 [#1] PREEMPT SMP ARM Modules linked in: CPU: 1 PID: 89 Comm: kworker/1:2 Not tainted 4.7.0-03348-g90dc3680458a-dirty #99 Hardware name: Generic DT based system Workqueue: pm pm_runtime_work task: df3c6300 ti: dec8a000 task.ti: dec8a000 PC is at regulator_disable+0x0/0x6c LR is at bmp280_runtime_suspend+0x3c/0xa4 Dereferencing the BMP280 state container properly fixes the problem, sorry for screwing up. Fixes:3d838118c6
("iio: pressure: bmp280: add power management") Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Cc: <Stable@vger.kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
1120 lines
27 KiB
C
1120 lines
27 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Datasheet:
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* https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP180-DS000-121.pdf
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* https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BMP280-DS001-12.pdf
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* https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280_DS001-11.pdf
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*/
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#define pr_fmt(fmt) "bmp280: " fmt
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#include <linux/device.h>
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#include <linux/module.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 "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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struct bmp180_calib {
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s16 AC1;
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s16 AC2;
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s16 AC3;
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u16 AC4;
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u16 AC5;
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u16 AC6;
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s16 B1;
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s16 B2;
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s16 MB;
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s16 MC;
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s16 MD;
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};
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struct bmp280_data {
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struct device *dev;
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struct mutex lock;
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struct regmap *regmap;
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struct completion done;
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bool use_eoc;
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const struct bmp280_chip_info *chip_info;
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struct bmp180_calib calib;
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struct regulator *vddd;
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struct regulator *vdda;
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unsigned int start_up_time; /* in milliseconds */
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/* log of base 2 of oversampling rate */
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u8 oversampling_press;
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u8 oversampling_temp;
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u8 oversampling_humid;
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/*
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* Carryover value from temperature conversion, used in pressure
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* calculation.
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*/
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s32 t_fine;
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};
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struct bmp280_chip_info {
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const int *oversampling_temp_avail;
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int num_oversampling_temp_avail;
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const int *oversampling_press_avail;
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int num_oversampling_press_avail;
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const int *oversampling_humid_avail;
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int num_oversampling_humid_avail;
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int (*chip_config)(struct bmp280_data *);
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int (*read_temp)(struct bmp280_data *, int *);
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int (*read_press)(struct bmp280_data *, int *, int *);
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int (*read_humid)(struct bmp280_data *, int *, int *);
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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 };
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enum { P1, P2, P3, P4, P5, P6, P7, P8, P9 };
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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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/*
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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 device *dev = data->dev;
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unsigned int H1, H3, tmp;
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int H2, H4, H5, H6, ret, var;
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ret = regmap_read(data->regmap, BMP280_REG_COMP_H1, &H1);
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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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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H2, &tmp, 2);
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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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H2 = sign_extend32(le16_to_cpu(tmp), 15);
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ret = regmap_read(data->regmap, BMP280_REG_COMP_H3, &H3);
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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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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H4, &tmp, 2);
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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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H4 = sign_extend32(((be16_to_cpu(tmp) >> 4) & 0xff0) |
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(be16_to_cpu(tmp) & 0xf), 11);
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_H5, &tmp, 2);
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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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H5 = sign_extend32(((le16_to_cpu(tmp) >> 4) & 0xfff), 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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H6 = sign_extend32(tmp, 7);
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var = ((s32)data->t_fine) - 76800;
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var = ((((adc_humidity << 14) - (H4 << 20) - (H5 * var)) + 16384) >> 15)
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* (((((((var * H6) >> 10) * (((var * H3) >> 11) + 32768)) >> 10)
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+ 2097152) * H2 + 8192) >> 14);
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var -= ((((var >> 15) * (var >> 15)) >> 7) * H1) >> 4;
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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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int ret;
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s32 var1, var2;
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__le16 buf[BMP280_COMP_TEMP_REG_COUNT / 2];
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_TEMP_START,
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buf, BMP280_COMP_TEMP_REG_COUNT);
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if (ret < 0) {
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dev_err(data->dev,
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"failed to read temperature calibration parameters\n");
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return ret;
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}
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/*
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* The double casts are necessary because le16_to_cpu returns an
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* unsigned 16-bit value. Casting that value directly to a
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* signed 32-bit will not do proper sign extension.
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*
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* Conversely, T1 and P1 are unsigned values, so they can be
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* cast straight to the larger type.
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*/
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var1 = (((adc_temp >> 3) - ((s32)le16_to_cpu(buf[T1]) << 1)) *
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((s32)(s16)le16_to_cpu(buf[T2]))) >> 11;
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var2 = (((((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1]))) *
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((adc_temp >> 4) - ((s32)le16_to_cpu(buf[T1])))) >> 12) *
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((s32)(s16)le16_to_cpu(buf[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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int ret;
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s64 var1, var2, p;
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__le16 buf[BMP280_COMP_PRESS_REG_COUNT / 2];
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ret = regmap_bulk_read(data->regmap, BMP280_REG_COMP_PRESS_START,
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buf, BMP280_COMP_PRESS_REG_COUNT);
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if (ret < 0) {
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dev_err(data->dev,
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"failed to read pressure calibration parameters\n");
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return ret;
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}
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var1 = ((s64)data->t_fine) - 128000;
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var2 = var1 * var1 * (s64)(s16)le16_to_cpu(buf[P6]);
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var2 += (var1 * (s64)(s16)le16_to_cpu(buf[P5])) << 17;
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var2 += ((s64)(s16)le16_to_cpu(buf[P4])) << 35;
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var1 = ((var1 * var1 * (s64)(s16)le16_to_cpu(buf[P3])) >> 8) +
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((var1 * (s64)(s16)le16_to_cpu(buf[P2])) << 12);
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var1 = ((((s64)1) << 47) + var1) * ((s64)le16_to_cpu(buf[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)(s16)le16_to_cpu(buf[P9])) * (p >> 13) * (p >> 13)) >> 25;
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var2 = (((s64)(s16)le16_to_cpu(buf[P8])) * p) >> 19;
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p = ((p + var1 + var2) >> 8) + (((s64)(s16)le16_to_cpu(buf[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)
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{
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int ret;
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__be32 tmp = 0;
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s32 adc_temp, comp_temp;
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ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB,
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(u8 *) &tmp, 3);
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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 = be32_to_cpu(tmp) >> 12;
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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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int ret;
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__be32 tmp = 0;
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s32 adc_press;
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u32 comp_press;
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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);
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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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(u8 *) &tmp, 3);
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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 = be32_to_cpu(tmp) >> 12;
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comp_press = bmp280_compensate_press(data, adc_press);
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*val = comp_press;
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*val2 = 256000;
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return IIO_VAL_FRACTIONAL;
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}
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static int bmp280_read_humid(struct bmp280_data *data, int *val, int *val2)
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{
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int ret;
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__be16 tmp = 0;
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s32 adc_humidity;
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u32 comp_humidity;
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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);
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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_HUMIDITY_MSB,
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(u8 *) &tmp, 2);
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if (ret < 0) {
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dev_err(data->dev, "failed to read humidity\n");
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return ret;
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}
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adc_humidity = be16_to_cpu(tmp);
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comp_humidity = bmp280_compensate_humidity(data, adc_humidity);
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*val = comp_humidity;
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*val2 = 1024;
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return IIO_VAL_FRACTIONAL;
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}
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static int bmp280_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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int ret;
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struct bmp280_data *data = iio_priv(indio_dev);
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pm_runtime_get_sync(data->dev);
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mutex_lock(&data->lock);
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switch (mask) {
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case IIO_CHAN_INFO_PROCESSED:
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switch (chan->type) {
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case IIO_HUMIDITYRELATIVE:
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ret = data->chip_info->read_humid(data, val, val2);
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break;
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case IIO_PRESSURE:
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ret = data->chip_info->read_press(data, val, val2);
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break;
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case IIO_TEMP:
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ret = data->chip_info->read_temp(data, val);
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break;
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default:
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ret = -EINVAL;
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break;
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}
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break;
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case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
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switch (chan->type) {
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case IIO_HUMIDITYRELATIVE:
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*val = 1 << data->oversampling_humid;
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ret = IIO_VAL_INT;
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break;
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case IIO_PRESSURE:
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*val = 1 << data->oversampling_press;
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ret = IIO_VAL_INT;
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break;
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case IIO_TEMP:
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*val = 1 << data->oversampling_temp;
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ret = IIO_VAL_INT;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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break;
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default:
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ret = -EINVAL;
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break;
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}
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mutex_unlock(&data->lock);
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pm_runtime_mark_last_busy(data->dev);
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pm_runtime_put_autosuspend(data->dev);
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return ret;
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}
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static int bmp280_write_oversampling_ratio_humid(struct bmp280_data *data,
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int val)
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{
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int i;
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const int *avail = data->chip_info->oversampling_humid_avail;
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const int n = data->chip_info->num_oversampling_humid_avail;
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for (i = 0; i < n; i++) {
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if (avail[i] == val) {
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data->oversampling_humid = ilog2(val);
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return data->chip_info->chip_config(data);
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}
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}
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return -EINVAL;
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}
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static int bmp280_write_oversampling_ratio_temp(struct bmp280_data *data,
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int val)
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{
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int i;
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const int *avail = data->chip_info->oversampling_temp_avail;
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const int n = data->chip_info->num_oversampling_temp_avail;
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for (i = 0; i < n; i++) {
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if (avail[i] == val) {
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data->oversampling_temp = ilog2(val);
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return data->chip_info->chip_config(data);
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}
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}
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return -EINVAL;
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}
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static int bmp280_write_oversampling_ratio_press(struct bmp280_data *data,
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int val)
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{
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int i;
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const int *avail = data->chip_info->oversampling_press_avail;
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const int n = data->chip_info->num_oversampling_press_avail;
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for (i = 0; i < n; i++) {
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if (avail[i] == val) {
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data->oversampling_press = ilog2(val);
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return data->chip_info->chip_config(data);
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}
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}
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return -EINVAL;
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}
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static int bmp280_write_raw(struct iio_dev *indio_dev,
|
|
struct iio_chan_spec const *chan,
|
|
int val, int val2, long mask)
|
|
{
|
|
int ret = 0;
|
|
struct bmp280_data *data = iio_priv(indio_dev);
|
|
|
|
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;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t bmp280_show_avail(char *buf, const int *vals, const int n)
|
|
{
|
|
size_t len = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++)
|
|
len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", vals[i]);
|
|
|
|
buf[len - 1] = '\n';
|
|
|
|
return len;
|
|
}
|
|
|
|
static ssize_t bmp280_show_temp_oversampling_avail(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
|
|
|
|
return bmp280_show_avail(buf, data->chip_info->oversampling_temp_avail,
|
|
data->chip_info->num_oversampling_temp_avail);
|
|
}
|
|
|
|
static ssize_t bmp280_show_press_oversampling_avail(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct bmp280_data *data = iio_priv(dev_to_iio_dev(dev));
|
|
|
|
return bmp280_show_avail(buf, data->chip_info->oversampling_press_avail,
|
|
data->chip_info->num_oversampling_press_avail);
|
|
}
|
|
|
|
static IIO_DEVICE_ATTR(in_temp_oversampling_ratio_available,
|
|
S_IRUGO, bmp280_show_temp_oversampling_avail, NULL, 0);
|
|
|
|
static IIO_DEVICE_ATTR(in_pressure_oversampling_ratio_available,
|
|
S_IRUGO, bmp280_show_press_oversampling_avail, NULL, 0);
|
|
|
|
static struct attribute *bmp280_attributes[] = {
|
|
&iio_dev_attr_in_temp_oversampling_ratio_available.dev_attr.attr,
|
|
&iio_dev_attr_in_pressure_oversampling_ratio_available.dev_attr.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group bmp280_attrs_group = {
|
|
.attrs = bmp280_attributes,
|
|
};
|
|
|
|
static const struct iio_info bmp280_info = {
|
|
.driver_module = THIS_MODULE,
|
|
.read_raw = &bmp280_read_raw,
|
|
.write_raw = &bmp280_write_raw,
|
|
.attrs = &bmp280_attrs_group,
|
|
};
|
|
|
|
static int bmp280_chip_config(struct bmp280_data *data)
|
|
{
|
|
int ret;
|
|
u8 osrs = BMP280_OSRS_TEMP_X(data->oversampling_temp + 1) |
|
|
BMP280_OSRS_PRESS_X(data->oversampling_press + 1);
|
|
|
|
ret = regmap_update_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 };
|
|
|
|
static const struct bmp280_chip_info bmp280_chip_info = {
|
|
.oversampling_temp_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
|
|
.oversampling_press_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
|
|
.chip_config = bmp280_chip_config,
|
|
.read_temp = bmp280_read_temp,
|
|
.read_press = bmp280_read_press,
|
|
};
|
|
|
|
static int bme280_chip_config(struct bmp280_data *data)
|
|
{
|
|
int ret = bmp280_chip_config(data);
|
|
u8 osrs = BMP280_OSRS_HUMIDITIY_X(data->oversampling_humid + 1);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return regmap_update_bits(data->regmap, BMP280_REG_CTRL_HUMIDITY,
|
|
BMP280_OSRS_HUMIDITY_MASK, osrs);
|
|
}
|
|
|
|
static const struct bmp280_chip_info bme280_chip_info = {
|
|
.oversampling_temp_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
|
|
.oversampling_press_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_press_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
|
|
.oversampling_humid_avail = bmp280_oversampling_avail,
|
|
.num_oversampling_humid_avail = ARRAY_SIZE(bmp280_oversampling_avail),
|
|
|
|
.chip_config = bme280_chip_config,
|
|
.read_temp = bmp280_read_temp,
|
|
.read_press = bmp280_read_press,
|
|
.read_humid = bmp280_read_humid,
|
|
};
|
|
|
|
static int bmp180_measure(struct bmp280_data *data, u8 ctrl_meas)
|
|
{
|
|
int ret;
|
|
const int conversion_time_max[] = { 4500, 7500, 13500, 25500 };
|
|
unsigned int delay_us;
|
|
unsigned int ctrl;
|
|
|
|
if (data->use_eoc)
|
|
init_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 (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;
|
|
__be16 tmp = 0;
|
|
|
|
ret = bmp180_measure(data, BMP180_MEAS_TEMP);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB, (u8 *)&tmp, 2);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*val = be16_to_cpu(tmp);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bmp180_read_calib(struct bmp280_data *data,
|
|
struct bmp180_calib *calib)
|
|
{
|
|
int ret;
|
|
int i;
|
|
__be16 buf[BMP180_REG_CALIB_COUNT / 2];
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_CALIB_START, buf,
|
|
sizeof(buf));
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* None of the words has the value 0 or 0xFFFF */
|
|
for (i = 0; i < ARRAY_SIZE(buf); i++) {
|
|
if (buf[i] == cpu_to_be16(0) || buf[i] == cpu_to_be16(0xffff))
|
|
return -EIO;
|
|
}
|
|
|
|
/* Toss the calibration data into the entropy pool */
|
|
add_device_randomness(buf, sizeof(buf));
|
|
|
|
calib->AC1 = be16_to_cpu(buf[AC1]);
|
|
calib->AC2 = be16_to_cpu(buf[AC2]);
|
|
calib->AC3 = be16_to_cpu(buf[AC3]);
|
|
calib->AC4 = be16_to_cpu(buf[AC4]);
|
|
calib->AC5 = be16_to_cpu(buf[AC5]);
|
|
calib->AC6 = be16_to_cpu(buf[AC6]);
|
|
calib->B1 = be16_to_cpu(buf[B1]);
|
|
calib->B2 = be16_to_cpu(buf[B2]);
|
|
calib->MB = be16_to_cpu(buf[MB]);
|
|
calib->MC = be16_to_cpu(buf[MC]);
|
|
calib->MD = be16_to_cpu(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)
|
|
{
|
|
s32 x1, x2;
|
|
struct bmp180_calib *calib = &data->calib;
|
|
|
|
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 ret;
|
|
s32 adc_temp, comp_temp;
|
|
|
|
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)
|
|
{
|
|
int ret;
|
|
__be32 tmp = 0;
|
|
u8 oss = data->oversampling_press;
|
|
|
|
ret = bmp180_measure(data, BMP180_MEAS_PRESS_X(oss));
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB, (u8 *)&tmp, 3);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*val = (be32_to_cpu(tmp) >> 8) >> (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)
|
|
{
|
|
s32 x1, x2, x3, p;
|
|
s32 b3, b6;
|
|
u32 b4, b7;
|
|
s32 oss = data->oversampling_press;
|
|
struct bmp180_calib *calib = &data->calib;
|
|
|
|
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)
|
|
{
|
|
int ret;
|
|
s32 adc_press;
|
|
u32 comp_press;
|
|
|
|
/* Read and compensate temperature so we get a reading of t_fine. */
|
|
ret = bmp180_read_temp(data, 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 };
|
|
|
|
static const struct bmp280_chip_info bmp180_chip_info = {
|
|
.oversampling_temp_avail = bmp180_oversampling_temp_avail,
|
|
.num_oversampling_temp_avail =
|
|
ARRAY_SIZE(bmp180_oversampling_temp_avail),
|
|
|
|
.oversampling_press_avail = bmp180_oversampling_press_avail,
|
|
.num_oversampling_press_avail =
|
|
ARRAY_SIZE(bmp180_oversampling_press_avail),
|
|
|
|
.chip_config = bmp180_chip_config,
|
|
.read_temp = bmp180_read_temp,
|
|
.read_press = bmp180_read_press,
|
|
};
|
|
|
|
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;
|
|
}
|
|
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;
|
|
}
|
|
|
|
int bmp280_common_probe(struct device *dev,
|
|
struct regmap *regmap,
|
|
unsigned int chip,
|
|
const char *name,
|
|
int irq)
|
|
{
|
|
int ret;
|
|
struct iio_dev *indio_dev;
|
|
struct bmp280_data *data;
|
|
unsigned int chip_id;
|
|
struct gpio_desc *gpiod;
|
|
|
|
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->dev.parent = dev;
|
|
indio_dev->name = name;
|
|
indio_dev->channels = bmp280_channels;
|
|
indio_dev->info = &bmp280_info;
|
|
indio_dev->modes = INDIO_DIRECT_MODE;
|
|
|
|
switch (chip) {
|
|
case BMP180_CHIP_ID:
|
|
indio_dev->num_channels = 2;
|
|
data->chip_info = &bmp180_chip_info;
|
|
data->oversampling_press = ilog2(8);
|
|
data->oversampling_temp = ilog2(1);
|
|
data->start_up_time = 10;
|
|
break;
|
|
case BMP280_CHIP_ID:
|
|
indio_dev->num_channels = 2;
|
|
data->chip_info = &bmp280_chip_info;
|
|
data->oversampling_press = ilog2(16);
|
|
data->oversampling_temp = ilog2(2);
|
|
data->start_up_time = 2;
|
|
break;
|
|
case BME280_CHIP_ID:
|
|
indio_dev->num_channels = 3;
|
|
data->chip_info = &bme280_chip_info;
|
|
data->oversampling_press = ilog2(16);
|
|
data->oversampling_humid = ilog2(16);
|
|
data->oversampling_temp = ilog2(2);
|
|
data->start_up_time = 2;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Bring up regulators */
|
|
data->vddd = devm_regulator_get(dev, "vddd");
|
|
if (IS_ERR(data->vddd)) {
|
|
dev_err(dev, "failed to get VDDD regulator\n");
|
|
return PTR_ERR(data->vddd);
|
|
}
|
|
ret = regulator_enable(data->vddd);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable VDDD regulator\n");
|
|
return ret;
|
|
}
|
|
data->vdda = devm_regulator_get(dev, "vdda");
|
|
if (IS_ERR(data->vdda)) {
|
|
dev_err(dev, "failed to get VDDA regulator\n");
|
|
ret = PTR_ERR(data->vdda);
|
|
goto out_disable_vddd;
|
|
}
|
|
ret = regulator_enable(data->vdda);
|
|
if (ret) {
|
|
dev_err(dev, "failed to enable VDDA regulator\n");
|
|
goto out_disable_vddd;
|
|
}
|
|
/* Wait to make sure we started up properly */
|
|
mdelay(data->start_up_time);
|
|
|
|
/* Bring chip out of reset if there is an assigned GPIO line */
|
|
gpiod = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
|
|
/* Deassert the signal */
|
|
if (!IS_ERR(gpiod)) {
|
|
dev_info(dev, "release reset\n");
|
|
gpiod_set_value(gpiod, 0);
|
|
}
|
|
|
|
data->regmap = regmap;
|
|
ret = regmap_read(regmap, BMP280_REG_ID, &chip_id);
|
|
if (ret < 0)
|
|
goto out_disable_vdda;
|
|
if (chip_id != chip) {
|
|
dev_err(dev, "bad chip id: expected %x got %x\n",
|
|
chip, chip_id);
|
|
ret = -EINVAL;
|
|
goto out_disable_vdda;
|
|
}
|
|
|
|
ret = data->chip_info->chip_config(data);
|
|
if (ret < 0)
|
|
goto out_disable_vdda;
|
|
|
|
dev_set_drvdata(dev, indio_dev);
|
|
|
|
/*
|
|
* The BMP085 and BMP180 has calibration in an E2PROM, read it out
|
|
* at probe time. It will not change.
|
|
*/
|
|
if (chip_id == BMP180_CHIP_ID) {
|
|
ret = bmp180_read_calib(data, &data->calib);
|
|
if (ret < 0) {
|
|
dev_err(data->dev,
|
|
"failed to read calibration coefficients\n");
|
|
goto out_disable_vdda;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
goto out_disable_vdda;
|
|
}
|
|
|
|
/* 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 *100);
|
|
pm_runtime_use_autosuspend(dev);
|
|
pm_runtime_put(dev);
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret)
|
|
goto out_runtime_pm_disable;
|
|
|
|
|
|
return 0;
|
|
|
|
out_runtime_pm_disable:
|
|
pm_runtime_get_sync(data->dev);
|
|
pm_runtime_put_noidle(data->dev);
|
|
pm_runtime_disable(data->dev);
|
|
out_disable_vdda:
|
|
regulator_disable(data->vdda);
|
|
out_disable_vddd:
|
|
regulator_disable(data->vddd);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(bmp280_common_probe);
|
|
|
|
int bmp280_common_remove(struct device *dev)
|
|
{
|
|
struct iio_dev *indio_dev = dev_get_drvdata(dev);
|
|
struct bmp280_data *data = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
pm_runtime_get_sync(data->dev);
|
|
pm_runtime_put_noidle(data->dev);
|
|
pm_runtime_disable(data->dev);
|
|
regulator_disable(data->vdda);
|
|
regulator_disable(data->vddd);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(bmp280_common_remove);
|
|
|
|
#ifdef CONFIG_PM
|
|
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);
|
|
int ret;
|
|
|
|
ret = regulator_disable(data->vdda);
|
|
if (ret)
|
|
return ret;
|
|
return regulator_disable(data->vddd);
|
|
}
|
|
|
|
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_enable(data->vddd);
|
|
if (ret)
|
|
return ret;
|
|
ret = regulator_enable(data->vdda);
|
|
if (ret)
|
|
return ret;
|
|
msleep(data->start_up_time);
|
|
return data->chip_info->chip_config(data);
|
|
}
|
|
#endif /* CONFIG_PM */
|
|
|
|
const struct dev_pm_ops bmp280_dev_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
|
|
pm_runtime_force_resume)
|
|
SET_RUNTIME_PM_OPS(bmp280_runtime_suspend,
|
|
bmp280_runtime_resume, NULL)
|
|
};
|
|
EXPORT_SYMBOL(bmp280_dev_pm_ops);
|
|
|
|
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
|
|
MODULE_DESCRIPTION("Driver for Bosch Sensortec BMP180/BMP280 pressure and temperature sensor");
|
|
MODULE_LICENSE("GPL v2");
|