diff options
author | Tomasz Duszynski <tduszyns@gmail.com> | 2015-03-14 21:29:31 +0100 |
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committer | Jonathan Cameron <jic23@kernel.org> | 2015-03-15 11:47:46 +0000 |
commit | c0644160a8b5e56b3c3896d77ac3d50d41fa9336 (patch) | |
tree | 9cd8486122d69d05455b20b7e831758e55917514 /drivers | |
parent | 8b0544263761adbc7308f6910cdcc0d601782cb1 (diff) | |
download | op-kernel-dev-c0644160a8b5e56b3c3896d77ac3d50d41fa9336.zip op-kernel-dev-c0644160a8b5e56b3c3896d77ac3d50d41fa9336.tar.gz |
iio: pressure: add support for MS5611 pressure and temperature sensor
Add support for Measurement Specialities MS5611 pressure
and temperature sensor.
Signed-off-by: Tomasz Duszynski <tduszyns@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/iio/pressure/Kconfig | 27 | ||||
-rw-r--r-- | drivers/iio/pressure/Makefile | 3 | ||||
-rw-r--r-- | drivers/iio/pressure/ms5611.h | 44 | ||||
-rw-r--r-- | drivers/iio/pressure/ms5611_core.c | 215 | ||||
-rw-r--r-- | drivers/iio/pressure/ms5611_i2c.c | 128 | ||||
-rw-r--r-- | drivers/iio/pressure/ms5611_spi.c | 127 |
6 files changed, 544 insertions, 0 deletions
diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig index a3be537..fa62950 100644 --- a/drivers/iio/pressure/Kconfig +++ b/drivers/iio/pressure/Kconfig @@ -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 diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile index 88011f2..a4f98f8 100644 --- a/drivers/iio/pressure/Makefile +++ b/drivers/iio/pressure/Makefile @@ -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 diff --git a/drivers/iio/pressure/ms5611.h b/drivers/iio/pressure/ms5611.h new file mode 100644 index 0000000..099c6cd --- /dev/null +++ b/drivers/iio/pressure/ms5611.h @@ -0,0 +1,44 @@ +/* + * 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 */ diff --git a/drivers/iio/pressure/ms5611_core.c b/drivers/iio/pressure/ms5611_core.c new file mode 100644 index 0000000..e42c853 --- /dev/null +++ b/drivers/iio/pressure/ms5611_core.c @@ -0,0 +1,215 @@ +/* + * 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"); diff --git a/drivers/iio/pressure/ms5611_i2c.c b/drivers/iio/pressure/ms5611_i2c.c new file mode 100644 index 0000000..748fd9a --- /dev/null +++ b/drivers/iio/pressure/ms5611_i2c.c @@ -0,0 +1,128 @@ +/* + * 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"); diff --git a/drivers/iio/pressure/ms5611_spi.c b/drivers/iio/pressure/ms5611_spi.c new file mode 100644 index 0000000..976726f --- /dev/null +++ b/drivers/iio/pressure/ms5611_spi.c @@ -0,0 +1,127 @@ +/* + * MS5611 pressure and temperature sensor driver (SPI 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. + * + */ + +#include <linux/delay.h> +#include <linux/module.h> +#include <linux/spi/spi.h> + +#include "ms5611.h" + +static int ms5611_spi_reset(struct device *dev) +{ + u8 cmd = MS5611_RESET; + struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); + + return spi_write_then_read(st->client, &cmd, 1, NULL, 0); +} + +static int ms5611_spi_read_prom_word(struct device *dev, int index, u16 *word) +{ + int ret; + struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); + + ret = spi_w8r16be(st->client, MS5611_READ_PROM_WORD + (index << 1)); + if (ret < 0) + return ret; + + *word = ret; + + return 0; +} + +static int ms5611_spi_read_adc(struct device *dev, s32 *val) +{ + int ret; + u8 buf[3] = { MS5611_READ_ADC }; + struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); + + ret = spi_write_then_read(st->client, buf, 1, buf, 3); + if (ret < 0) + return ret; + + *val = (buf[0] << 16) | (buf[1] << 8) | buf[2]; + + return 0; +} + +static int ms5611_spi_read_adc_temp_and_pressure(struct device *dev, + s32 *temp, s32 *pressure) +{ + u8 cmd; + int ret; + struct ms5611_state *st = iio_priv(dev_to_iio_dev(dev)); + + cmd = MS5611_START_TEMP_CONV; + ret = spi_write_then_read(st->client, &cmd, 1, NULL, 0); + if (ret < 0) + return ret; + + usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX); + + ret = ms5611_spi_read_adc(dev, temp); + if (ret < 0) + return ret; + + cmd = MS5611_START_PRESSURE_CONV; + ret = spi_write_then_read(st->client, &cmd, 1, NULL, 0); + if (ret < 0) + return ret; + + usleep_range(MS5611_CONV_TIME_MIN, MS5611_CONV_TIME_MAX); + + return ms5611_spi_read_adc(dev, pressure); +} + +static int ms5611_spi_probe(struct spi_device *spi) +{ + int ret; + struct ms5611_state *st; + struct iio_dev *indio_dev; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + spi->mode = SPI_MODE_0; + spi->max_speed_hz = 20000000; + spi->bits_per_word = 8; + ret = spi_setup(spi); + if (ret < 0) + return ret; + + st = iio_priv(indio_dev); + st->reset = ms5611_spi_reset; + st->read_prom_word = ms5611_spi_read_prom_word; + st->read_adc_temp_and_pressure = ms5611_spi_read_adc_temp_and_pressure; + st->client = spi; + + return ms5611_probe(indio_dev, &spi->dev); +} + +static const struct spi_device_id ms5611_id[] = { + { "ms5611", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, ms5611_id); + +static struct spi_driver ms5611_driver = { + .driver = { + .name = "ms5611", + .owner = THIS_MODULE, + }, + .id_table = ms5611_id, + .probe = ms5611_spi_probe, +}; +module_spi_driver(ms5611_driver); + +MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>"); +MODULE_DESCRIPTION("MS5611 spi driver"); +MODULE_LICENSE("GPL v2"); |