iio: pressure: add support for MS5611 pressure and temperature sensor (c0644160) · Commits · e / devices / android_kernel_oneplus_sm7250

drivers/iio/pressure/Kconfig

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		@@ -52,6 +52,33 @@ config MPL3115
		To compile this driver as a module, choose M here: the module
		will be called mpl3115.

		config MS5611
		tristate "Measurement Specialities MS5611 pressure sensor driver"
		help
		Say Y here to build support for the Measurement Specialities
		MS5611 pressure and temperature sensor.

		To compile this driver as a module, choose M here: the module will
		be called ms5611_core.

		config MS5611_I2C
		tristate "support I2C bus connection"
		depends on I2C && MS5611
		help
		Say Y here to build I2C bus support for MS5611.

		To compile this driver as a module, choose M here: the module will
		be called ms5611_i2c.

		config MS5611_SPI
		tristate "support SPI bus connection"
		depends on SPI_MASTER && MS5611
		help
		Say Y here to build SPI bus support for MS5611.

		To compile this driver as a module, choose M here: the module will
		be called ms5611_spi.

		config IIO_ST_PRESS
		tristate "STMicroelectronics pressure sensor Driver"
		depends on (I2C \|\| SPI_MASTER) && SYSFS

drivers/iio/pressure/Makefile

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		@@ -7,6 +7,9 @@ obj-$(CONFIG_BMP280) += bmp280.o
		obj-$(CONFIG_HID_SENSOR_PRESS) += hid-sensor-press.o
		obj-$(CONFIG_MPL115) += mpl115.o
		obj-$(CONFIG_MPL3115) += mpl3115.o
		obj-$(CONFIG_MS5611) += ms5611_core.o
		obj-$(CONFIG_MS5611_I2C) += ms5611_i2c.o
		obj-$(CONFIG_MS5611_SPI) += ms5611_spi.o
		obj-$(CONFIG_IIO_ST_PRESS) += st_pressure.o
		st_pressure-y := st_pressure_core.o
		st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o

drivers/iio/pressure/ms5611.h

0 → 100644

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		/*
		* MS5611 pressure and temperature sensor driver
		*
		* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		*/

		#ifndef _MS5611_H
		#define _MS5611_H

		#include <linux/device.h>
		#include <linux/iio/iio.h>
		#include <linux/mutex.h>

		#define MS5611_RESET 0x1e
		#define MS5611_READ_ADC 0x00
		#define MS5611_READ_PROM_WORD 0xA0
		#define MS5611_START_TEMP_CONV 0x58
		#define MS5611_START_PRESSURE_CONV 0x48

		#define MS5611_CONV_TIME_MIN 9040
		#define MS5611_CONV_TIME_MAX 10000

		#define MS5611_PROM_WORDS_NB 8

		struct ms5611_state {
		void *client;
		struct mutex lock;

		int (reset)(struct device dev);
		int (read_prom_word)(struct device dev, int index, u16 *word);
		int (read_adc_temp_and_pressure)(struct device dev,
		s32 temp, s32 pressure);

		u16 prom[MS5611_PROM_WORDS_NB];
		};

		int ms5611_probe(struct iio_dev indio_dev, struct device dev);

		#endif /* _MS5611_H */

drivers/iio/pressure/ms5611_core.c

0 → 100644

+215 −0

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		/*
		* MS5611 pressure and temperature sensor driver
		*
		* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* Data sheet:
		* http://www.meas-spec.com/downloads/MS5611-01BA03.pdf
		*
		*/

		#include <linux/module.h>
		#include <linux/iio/iio.h>
		#include <linux/delay.h>

		#include "ms5611.h"

		static bool ms5611_prom_is_valid(u16 *prom, size_t len)
		{
		int i, j;
		uint16_t crc = 0, crc_orig = prom[7] & 0x000F;

		prom[7] &= 0xFF00;

		for (i = 0; i < len * 2; i++) {
		if (i % 2 == 1)
		crc ^= prom[i >> 1] & 0x00FF;
		else
		crc ^= prom[i >> 1] >> 8;

		for (j = 0; j < 8; j++) {
		if (crc & 0x8000)
		crc = (crc << 1) ^ 0x3000;
		else
		crc <<= 1;
		}
		}

		crc = (crc >> 12) & 0x000F;

		return crc_orig != 0x0000 && crc == crc_orig;
		}

		static int ms5611_read_prom(struct iio_dev *indio_dev)
		{
		int ret, i;
		struct ms5611_state *st = iio_priv(indio_dev);

		for (i = 0; i < MS5611_PROM_WORDS_NB; i++) {
		ret = st->read_prom_word(&indio_dev->dev, i, &st->prom[i]);
		if (ret < 0) {
		dev_err(&indio_dev->dev,
		"failed to read prom at %d\n", i);
		return ret;
		}
		}

		if (!ms5611_prom_is_valid(st->prom, MS5611_PROM_WORDS_NB)) {
		dev_err(&indio_dev->dev, "PROM integrity check failed\n");
		return -ENODEV;
		}

		return 0;
		}

		static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev,
		s32 temp, s32 pressure)
		{
		int ret;
		s32 t, p;
		s64 off, sens, dt;
		struct ms5611_state *st = iio_priv(indio_dev);

		ret = st->read_adc_temp_and_pressure(&indio_dev->dev, &t, &p);
		if (ret < 0) {
		dev_err(&indio_dev->dev,
		"failed to read temperature and pressure\n");
		return ret;
		}

		dt = t - (st->prom[5] << 8);
		off = ((s64)st->prom[2] << 16) + ((st->prom[4] * dt) >> 7);
		sens = ((s64)st->prom[1] << 15) + ((st->prom[3] * dt) >> 8);

		t = 2000 + ((st->prom[6] * dt) >> 23);
		if (t < 2000) {
		s64 off2, sens2, t2;

		t2 = (dt * dt) >> 31;
		off2 = (5 * (t - 2000) * (t - 2000)) >> 1;
		sens2 = off2 >> 1;

		if (t < -1500) {
		s64 tmp = (t + 1500) * (t + 1500);

		off2 += 7 * tmp;
		sens2 += (11 * tmp) >> 1;
		}

		t -= t2;
		off -= off2;
		sens -= sens2;
		}

		*temp = t;
		pressure = (((p sens) >> 21) - off) >> 15;

		return 0;
		}

		static int ms5611_reset(struct iio_dev *indio_dev)
		{
		int ret;
		struct ms5611_state *st = iio_priv(indio_dev);

		ret = st->reset(&indio_dev->dev);
		if (ret < 0) {
		dev_err(&indio_dev->dev, "failed to reset device\n");
		return ret;
		}

		usleep_range(3000, 4000);

		return 0;
		}

		static int ms5611_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan,
		int val, int val2, long mask)
		{
		int ret;
		s32 temp, pressure;
		struct ms5611_state *st = iio_priv(indio_dev);

		switch (mask) {
		case IIO_CHAN_INFO_PROCESSED:
		mutex_lock(&st->lock);
		ret = ms5611_read_temp_and_pressure(indio_dev,
		&temp, &pressure);
		mutex_unlock(&st->lock);
		if (ret < 0)
		return ret;

		switch (chan->type) {
		case IIO_TEMP:
		val = temp 10;
		return IIO_VAL_INT;
		case IIO_PRESSURE:
		*val = pressure / 1000;
		val2 = (pressure % 1000) 1000;
		return IIO_VAL_INT_PLUS_MICRO;
		default:
		return -EINVAL;
		}
		}

		return -EINVAL;
		}

		static const struct iio_chan_spec ms5611_channels[] = {
		{
		.type = IIO_PRESSURE,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) \|
		BIT(IIO_CHAN_INFO_SCALE)
		},
		{
		.type = IIO_TEMP,
		.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) \|
		BIT(IIO_CHAN_INFO_SCALE)
		}
		};

		static const struct iio_info ms5611_info = {
		.read_raw = &ms5611_read_raw,
		.driver_module = THIS_MODULE,
		};

		static int ms5611_init(struct iio_dev *indio_dev)
		{
		int ret;

		ret = ms5611_reset(indio_dev);
		if (ret < 0)
		return ret;

		return ms5611_read_prom(indio_dev);
		}

		int ms5611_probe(struct iio_dev indio_dev, struct device dev)
		{
		int ret;
		struct ms5611_state *st = iio_priv(indio_dev);

		mutex_init(&st->lock);
		indio_dev->dev.parent = dev;
		indio_dev->name = dev->driver->name;
		indio_dev->info = &ms5611_info;
		indio_dev->channels = ms5611_channels;
		indio_dev->num_channels = ARRAY_SIZE(ms5611_channels);
		indio_dev->modes = INDIO_DIRECT_MODE;

		ret = ms5611_init(indio_dev);
		if (ret < 0)
		return ret;

		return devm_iio_device_register(dev, indio_dev);
		}
		EXPORT_SYMBOL(ms5611_probe);

		MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
		MODULE_DESCRIPTION("MS5611 core driver");
		MODULE_LICENSE("GPL v2");

drivers/iio/pressure/ms5611_i2c.c

0 → 100644

+128 −0

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		/*
		* MS5611 pressure and temperature sensor driver (I2C bus)
		*
		* Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* 7-bit I2C slave addresses:
		*
		* 0x77 (CSB pin low)
		* 0x76 (CSB pin high)
		*
		*/

		#include <linux/delay.h>
		#include <linux/i2c.h>
		#include <linux/module.h>

		#include "ms5611.h"

		static int ms5611_i2c_reset(struct device *dev)
		{
		struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));

		return i2c_smbus_write_byte(st->client, MS5611_RESET);
		}

		static int ms5611_i2c_read_prom_word(struct device dev, int index, u16 word)
		{
		int ret;
		struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));

		ret = i2c_smbus_read_word_swapped(st->client,
		MS5611_READ_PROM_WORD + (index << 1));
		if (ret < 0)
		return ret;

		*word = ret;

		return 0;
		}

		static int ms5611_i2c_read_adc(struct ms5611_state st, s32 val)
		{
		int ret;
		u8 buf[3];

		ret = i2c_smbus_read_i2c_block_data(st->client, MS5611_READ_ADC,
		3, buf);
		if (ret < 0)
		return ret;

		*val = (buf[0] << 16) \| (buf[1] << 8) \| buf[2];

		return 0;
		}

		static int ms5611_i2c_read_adc_temp_and_pressure(struct device *dev,
		s32 temp, s32 pressure)
		{
		int ret;
		struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev));

		ret = i2c_smbus_write_byte(st->client, MS5611_START_TEMP_CONV);
		if (ret < 0)
		return ret;

		usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);

		ret = ms5611_i2c_read_adc(st, temp);
		if (ret < 0)
		return ret;

		ret = i2c_smbus_write_byte(st->client, MS5611_START_PRESSURE_CONV);
		if (ret < 0)
		return ret;

		usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX);

		return ms5611_i2c_read_adc(st, pressure);
		}

		static int ms5611_i2c_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
		{
		struct ms5611_state *st;
		struct iio_dev *indio_dev;

		if (!i2c_check_functionality(client->adapter,
		I2C_FUNC_SMBUS_WRITE_BYTE \|
		I2C_FUNC_SMBUS_READ_WORD_DATA \|
		I2C_FUNC_SMBUS_READ_I2C_BLOCK))
		return -ENODEV;

		indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st));
		if (!indio_dev)
		return -ENOMEM;

		st = iio_priv(indio_dev);
		st->reset = ms5611_i2c_reset;
		st->read_prom_word = ms5611_i2c_read_prom_word;
		st->read_adc_temp_and_pressure = ms5611_i2c_read_adc_temp_and_pressure;
		st->client = client;

		return ms5611_probe(indio_dev, &client->dev);
		}

		static const struct i2c_device_id ms5611_id[] = {
		{ "ms5611", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, ms5611_id);

		static struct i2c_driver ms5611_driver = {
		.driver = {
		.name = "ms5611",
		.owner = THIS_MODULE,
		},
		.id_table = ms5611_id,
		.probe = ms5611_i2c_probe,
		};
		module_i2c_driver(ms5611_driver);

		MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
		MODULE_DESCRIPTION("MS5611 i2c driver");
		MODULE_LICENSE("GPL v2");