diff options
Diffstat (limited to 'drivers/iio/temperature')
| -rw-r--r-- | drivers/iio/temperature/Kconfig | 25 | ||||
| -rw-r--r-- | drivers/iio/temperature/Makefile | 1 | ||||
| -rw-r--r-- | drivers/iio/temperature/hid-sensor-temperature.c | 13 | ||||
| -rw-r--r-- | drivers/iio/temperature/max31856.c | 356 | ||||
| -rw-r--r-- | drivers/iio/temperature/maxim_thermocouple.c | 10 | ||||
| -rw-r--r-- | drivers/iio/temperature/mlx90614.c | 6 | ||||
| -rw-r--r-- | drivers/iio/temperature/mlx90632.c | 9 | ||||
| -rw-r--r-- | drivers/iio/temperature/tmp006.c | 5 | ||||
| -rw-r--r-- | drivers/iio/temperature/tmp007.c | 6 | ||||
| -rw-r--r-- | drivers/iio/temperature/tsys01.c | 3 | ||||
| -rw-r--r-- | drivers/iio/temperature/tsys02d.c | 3 |
11 files changed, 398 insertions, 39 deletions
diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig index 82e4a62745e2..737faa0901fe 100644 --- a/drivers/iio/temperature/Kconfig +++ b/drivers/iio/temperature/Kconfig @@ -1,3 +1,4 @@ +# SPDX-License-Identifier: GPL-2.0-only # # Temperature sensor drivers # @@ -66,14 +67,14 @@ config TMP006 be called tmp006. config TMP007 - tristate "TMP007 infrared thermopile sensor with Integrated Math Engine" - depends on I2C - help - If you say yes here you get support for the Texas Instruments - TMP007 infrared thermopile sensor with Integrated Math Engine. + tristate "TMP007 infrared thermopile sensor with Integrated Math Engine" + depends on I2C + help + If you say yes here you get support for the Texas Instruments + TMP007 infrared thermopile sensor with Integrated Math Engine. - This driver can also be built as a module. If so, the module will - be called tmp007. + This driver can also be built as a module. If so, the module will + be called tmp007. config TSYS01 tristate "Measurement Specialties TSYS01 temperature sensor using I2C bus connection" @@ -97,4 +98,14 @@ config TSYS02D This driver can also be built as a module. If so, the module will be called tsys02d. +config MAX31856 + tristate "MAX31856 thermocouple sensor" + depends on SPI + help + If you say yes here you get support for MAX31856 + thermocouple sensor chip connected via SPI. + + This driver can also be built as a module. If so, the module + will be called max31856. + endmenu diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile index 34a31db0bb63..baca4776ca0d 100644 --- a/drivers/iio/temperature/Makefile +++ b/drivers/iio/temperature/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_HID_SENSOR_TEMP) += hid-sensor-temperature.o obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o +obj-$(CONFIG_MAX31856) += max31856.o obj-$(CONFIG_MLX90614) += mlx90614.o obj-$(CONFIG_MLX90632) += mlx90632.o obj-$(CONFIG_TMP006) += tmp006.o diff --git a/drivers/iio/temperature/hid-sensor-temperature.c b/drivers/iio/temperature/hid-sensor-temperature.c index b592fc4f007e..eda55b9c1e9b 100644 --- a/drivers/iio/temperature/hid-sensor-temperature.c +++ b/drivers/iio/temperature/hid-sensor-temperature.c @@ -1,18 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * HID Sensors Driver * Copyright (c) 2017, Intel Corporation. - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - * You should have received a copy of the GNU General Public License along with - * this program. */ #include <linux/device.h> #include <linux/hid-sensor-hub.h> diff --git a/drivers/iio/temperature/max31856.c b/drivers/iio/temperature/max31856.c new file mode 100644 index 000000000000..f184ba5601d9 --- /dev/null +++ b/drivers/iio/temperature/max31856.c @@ -0,0 +1,356 @@ +// SPDX-License-Identifier: GPL-2.0 +/* max31856.c + * + * Maxim MAX31856 thermocouple sensor driver + * + * Copyright (C) 2018-2019 Rockwell Collins + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/err.h> +#include <linux/spi/spi.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <dt-bindings/iio/temperature/thermocouple.h> +/* + * The MSB of the register value determines whether the following byte will + * be written or read. If it is 0, one or more byte reads will follow. + */ +#define MAX31856_RD_WR_BIT BIT(7) + +#define MAX31856_CR0_AUTOCONVERT BIT(7) +#define MAX31856_CR0_1SHOT BIT(6) +#define MAX31856_CR0_OCFAULT BIT(4) +#define MAX31856_CR0_OCFAULT_MASK GENMASK(5, 4) +#define MAX31856_TC_TYPE_MASK GENMASK(3, 0) +#define MAX31856_FAULT_OVUV BIT(1) +#define MAX31856_FAULT_OPEN BIT(0) + +/* The MAX31856 registers */ +#define MAX31856_CR0_REG 0x00 +#define MAX31856_CR1_REG 0x01 +#define MAX31856_MASK_REG 0x02 +#define MAX31856_CJHF_REG 0x03 +#define MAX31856_CJLF_REG 0x04 +#define MAX31856_LTHFTH_REG 0x05 +#define MAX31856_LTHFTL_REG 0x06 +#define MAX31856_LTLFTH_REG 0x07 +#define MAX31856_LTLFTL_REG 0x08 +#define MAX31856_CJTO_REG 0x09 +#define MAX31856_CJTH_REG 0x0A +#define MAX31856_CJTL_REG 0x0B +#define MAX31856_LTCBH_REG 0x0C +#define MAX31856_LTCBM_REG 0x0D +#define MAX31856_LTCBL_REG 0x0E +#define MAX31856_SR_REG 0x0F + +static const struct iio_chan_spec max31856_channels[] = { + { /* Thermocouple Temperature */ + .type = IIO_TEMP, + .info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + }, + { /* Cold Junction Temperature */ + .type = IIO_TEMP, + .channel2 = IIO_MOD_TEMP_AMBIENT, + .modified = 1, + .info_mask_separate = + BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + }, +}; + +struct max31856_data { + struct spi_device *spi; + u32 thermocouple_type; +}; + +static int max31856_read(struct max31856_data *data, u8 reg, + u8 val[], unsigned int read_size) +{ + return spi_write_then_read(data->spi, ®, 1, val, read_size); +} + +static int max31856_write(struct max31856_data *data, u8 reg, + unsigned int val) +{ + u8 buf[2]; + + buf[0] = reg | (MAX31856_RD_WR_BIT); + buf[1] = val; + + return spi_write(data->spi, buf, 2); +} + +static int max31856_init(struct max31856_data *data) +{ + int ret; + u8 reg_cr0_val, reg_cr1_val; + + /* Start by changing to Off mode before making changes as + * some settings are recommended to be set only when the device + * is off + */ + ret = max31856_read(data, MAX31856_CR0_REG, ®_cr0_val, 1); + if (ret) + return ret; + + reg_cr0_val &= ~MAX31856_CR0_AUTOCONVERT; + ret = max31856_write(data, MAX31856_CR0_REG, reg_cr0_val); + if (ret) + return ret; + + /* Set thermocouple type based on dts property */ + ret = max31856_read(data, MAX31856_CR1_REG, ®_cr1_val, 1); + if (ret) + return ret; + + reg_cr1_val &= ~MAX31856_TC_TYPE_MASK; + reg_cr1_val |= data->thermocouple_type; + ret = max31856_write(data, MAX31856_CR1_REG, reg_cr1_val); + if (ret) + return ret; + + /* + * Enable Open circuit fault detection + * Read datasheet for more information: Table 4. + * Value 01 means : Enabled (Once every 16 conversions) + */ + reg_cr0_val &= ~MAX31856_CR0_OCFAULT_MASK; + reg_cr0_val |= MAX31856_CR0_OCFAULT; + + /* Set Auto Conversion Mode */ + reg_cr0_val &= ~MAX31856_CR0_1SHOT; + reg_cr0_val |= MAX31856_CR0_AUTOCONVERT; + + return max31856_write(data, MAX31856_CR0_REG, reg_cr0_val); +} + +static int max31856_thermocouple_read(struct max31856_data *data, + struct iio_chan_spec const *chan, + int *val) +{ + int ret, offset_cjto; + u8 reg_val[3]; + + switch (chan->channel2) { + case IIO_NO_MOD: + /* + * Multibyte Read + * MAX31856_LTCBH_REG, MAX31856_LTCBM_REG, MAX31856_LTCBL_REG + */ + ret = max31856_read(data, MAX31856_LTCBH_REG, reg_val, 3); + if (ret) + return ret; + /* Skip last 5 dead bits of LTCBL */ + *val = (reg_val[0] << 16 | reg_val[1] << 8 | reg_val[2]) >> 5; + /* Check 7th bit of LTCBH reg. value for sign*/ + if (reg_val[0] & 0x80) + *val -= 0x80000; + break; + + case IIO_MOD_TEMP_AMBIENT: + /* + * Multibyte Read + * MAX31856_CJTO_REG, MAX31856_CJTH_REG, MAX31856_CJTL_REG + */ + ret = max31856_read(data, MAX31856_CJTO_REG, reg_val, 3); + if (ret) + return ret; + /* Get Cold Junction Temp. offset register value */ + offset_cjto = reg_val[0]; + /* Get CJTH and CJTL value and skip last 2 dead bits of CJTL */ + *val = (reg_val[1] << 8 | reg_val[2]) >> 2; + /* As per datasheet add offset into CJTH and CJTL */ + *val += offset_cjto; + /* Check 7th bit of CJTH reg. value for sign */ + if (reg_val[1] & 0x80) + *val -= 0x4000; + break; + + default: + return -EINVAL; + } + + ret = max31856_read(data, MAX31856_SR_REG, reg_val, 1); + if (ret) + return ret; + /* Check for over/under voltage or open circuit fault */ + if (reg_val[0] & (MAX31856_FAULT_OVUV | MAX31856_FAULT_OPEN)) + return -EIO; + + return ret; +} + +static int max31856_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct max31856_data *data = iio_priv(indio_dev); + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = max31856_thermocouple_read(data, chan, val); + if (ret) + return ret; + return IIO_VAL_INT; + case IIO_CHAN_INFO_SCALE: + switch (chan->channel2) { + case IIO_MOD_TEMP_AMBIENT: + /* Cold junction Temp. Data resolution is 0.015625 */ + *val = 15; + *val2 = 625000; /* 1000 * 0.015625 */ + ret = IIO_VAL_INT_PLUS_MICRO; + break; + default: + /* Thermocouple Temp. Data resolution is 0.0078125 */ + *val = 7; + *val2 = 812500; /* 1000 * 0.0078125) */ + return IIO_VAL_INT_PLUS_MICRO; + } + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static ssize_t show_fault(struct device *dev, u8 faultbit, char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct max31856_data *data = iio_priv(indio_dev); + u8 reg_val; + int ret; + bool fault; + + ret = max31856_read(data, MAX31856_SR_REG, ®_val, 1); + if (ret) + return ret; + + fault = reg_val & faultbit; + + return sprintf(buf, "%d\n", fault); +} + +static ssize_t show_fault_ovuv(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return show_fault(dev, MAX31856_FAULT_OVUV, buf); +} + +static ssize_t show_fault_oc(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + return show_fault(dev, MAX31856_FAULT_OPEN, buf); +} + +static IIO_DEVICE_ATTR(fault_ovuv, 0444, show_fault_ovuv, NULL, 0); +static IIO_DEVICE_ATTR(fault_oc, 0444, show_fault_oc, NULL, 0); + +static struct attribute *max31856_attributes[] = { + &iio_dev_attr_fault_ovuv.dev_attr.attr, + &iio_dev_attr_fault_oc.dev_attr.attr, + NULL, +}; + +static const struct attribute_group max31856_group = { + .attrs = max31856_attributes, +}; + +static const struct iio_info max31856_info = { + .read_raw = max31856_read_raw, + .attrs = &max31856_group, +}; + +static int max31856_probe(struct spi_device *spi) +{ + const struct spi_device_id *id = spi_get_device_id(spi); + struct iio_dev *indio_dev; + struct max31856_data *data; + int ret; + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + data->spi = spi; + + spi_set_drvdata(spi, indio_dev); + + indio_dev->info = &max31856_info; + indio_dev->name = id->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = max31856_channels; + indio_dev->num_channels = ARRAY_SIZE(max31856_channels); + + ret = of_property_read_u32(spi->dev.of_node, "thermocouple-type", + &data->thermocouple_type); + + if (ret) { + dev_info(&spi->dev, + "Could not read thermocouple type DT property, configuring as a K-Type\n"); + data->thermocouple_type = THERMOCOUPLE_TYPE_K; + } + + /* + * no need to translate values as the supported types + * have the same value as the #defines + */ + switch (data->thermocouple_type) { + case THERMOCOUPLE_TYPE_B: + case THERMOCOUPLE_TYPE_E: + case THERMOCOUPLE_TYPE_J: + case THERMOCOUPLE_TYPE_K: + case THERMOCOUPLE_TYPE_N: + case THERMOCOUPLE_TYPE_R: + case THERMOCOUPLE_TYPE_S: + case THERMOCOUPLE_TYPE_T: + break; + default: + dev_err(&spi->dev, + "error: thermocouple-type %u not supported by max31856\n" + , data->thermocouple_type); + return -EINVAL; + } + + ret = max31856_init(data); + if (ret) { + dev_err(&spi->dev, "error: Failed to configure max31856\n"); + return ret; + } + + return devm_iio_device_register(&spi->dev, indio_dev); +} + +static const struct spi_device_id max31856_id[] = { + { "max31856", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, max31856_id); + +static const struct of_device_id max31856_of_match[] = { + { .compatible = "maxim,max31856" }, + { } +}; +MODULE_DEVICE_TABLE(of, max31856_of_match); + +static struct spi_driver max31856_driver = { + .driver = { + .name = "max31856", + .of_match_table = max31856_of_match, + }, + .probe = max31856_probe, + .id_table = max31856_id, +}; +module_spi_driver(max31856_driver); + +MODULE_AUTHOR("Paresh Chaudhary <paresh.chaudhary@rockwellcollins.com>"); +MODULE_AUTHOR("Patrick Havelange <patrick.havelange@essensium.com>"); +MODULE_DESCRIPTION("Maxim MAX31856 thermocouple sensor driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/iio/temperature/maxim_thermocouple.c b/drivers/iio/temperature/maxim_thermocouple.c index c31b9633f32d..c613a64c017f 100644 --- a/drivers/iio/temperature/maxim_thermocouple.c +++ b/drivers/iio/temperature/maxim_thermocouple.c @@ -10,6 +10,8 @@ #include <linux/init.h> #include <linux/mutex.h> #include <linux/err.h> +#include <linux/of.h> +#include <linux/of_device.h> #include <linux/spi/spi.h> #include <linux/iio/iio.h> #include <linux/iio/trigger.h> @@ -262,9 +264,17 @@ static const struct spi_device_id maxim_thermocouple_id[] = { }; MODULE_DEVICE_TABLE(spi, maxim_thermocouple_id); +static const struct of_device_id maxim_thermocouple_of_match[] = { + { .compatible = "maxim,max6675" }, + { .compatible = "maxim,max31855" }, + { }, +}; +MODULE_DEVICE_TABLE(of, maxim_thermocouple_of_match); + static struct spi_driver maxim_thermocouple_driver = { .driver = { .name = MAXIM_THERMOCOUPLE_DRV_NAME, + .of_match_table = maxim_thermocouple_of_match, }, .probe = maxim_thermocouple_probe, .remove = maxim_thermocouple_remove, diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c index 13a4cec64ea8..b7c56ddf884f 100644 --- a/drivers/iio/temperature/mlx90614.c +++ b/drivers/iio/temperature/mlx90614.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor * @@ -5,10 +6,6 @@ * Copyright (c) 2015 Essensium NV * Copyright (c) 2015 Melexis * - * This file is subject to the terms and conditions of version 2 of - * the GNU General Public License. See the file COPYING in the main - * directory of this archive for more details. - * * Driver for the Melexis MLX90614 I2C 16-bit IR thermopile sensor * * (7-bit I2C slave address 0x5a, 100KHz bus speed only!) @@ -20,7 +17,6 @@ * i2c adapter is locked since it cannot be used by other clients. The SCL line * always has a pull-up so we do not need an extra GPIO to drive it high. If * the "wakeup" GPIO is not given, power management will be disabled. - * */ #include <linux/err.h> diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c index be03be719efe..eaca6ba06864 100644 --- a/drivers/iio/temperature/mlx90632.c +++ b/drivers/iio/temperature/mlx90632.c @@ -81,6 +81,8 @@ /* Magic constants */ #define MLX90632_ID_MEDICAL 0x0105 /* EEPROM DSPv5 Medical device id */ #define MLX90632_ID_CONSUMER 0x0205 /* EEPROM DSPv5 Consumer device id */ +#define MLX90632_DSP_VERSION 5 /* DSP version */ +#define MLX90632_DSP_MASK GENMASK(7, 0) /* DSP version in EE_VERSION */ #define MLX90632_RESET_CMD 0x0006 /* Reset sensor (address or global) */ #define MLX90632_REF_12 12LL /**< ResCtrlRef value of Ch 1 or Ch 2 */ #define MLX90632_REF_3 12LL /**< ResCtrlRef value of Channel 3 */ @@ -667,10 +669,13 @@ static int mlx90632_probe(struct i2c_client *client, } else if (read == MLX90632_ID_CONSUMER) { dev_dbg(&client->dev, "Detected Consumer EEPROM calibration %x\n", read); + } else if ((read & MLX90632_DSP_MASK) == MLX90632_DSP_VERSION) { + dev_dbg(&client->dev, + "Detected Unknown EEPROM calibration %x\n", read); } else { dev_err(&client->dev, - "EEPROM version mismatch %x (expected %x or %x)\n", - read, MLX90632_ID_CONSUMER, MLX90632_ID_MEDICAL); + "Wrong DSP version %x (expected %x)\n", + read, MLX90632_DSP_VERSION); return -EPROTONOSUPPORT; } diff --git a/drivers/iio/temperature/tmp006.c b/drivers/iio/temperature/tmp006.c index a9b5b7cc7836..cc45d8345eb9 100644 --- a/drivers/iio/temperature/tmp006.c +++ b/drivers/iio/temperature/tmp006.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * tmp006.c - Support for TI TMP006 IR thermopile sensor * * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net> * - * This file is subject to the terms and conditions of version 2 of - * the GNU General Public License. See the file COPYING in the main - * directory of this archive for more details. - * * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor * * (7-bit I2C slave address 0x40, changeable via ADR pins) diff --git a/drivers/iio/temperature/tmp007.c b/drivers/iio/temperature/tmp007.c index 0e3f2d432e10..7df234d96f94 100644 --- a/drivers/iio/temperature/tmp007.c +++ b/drivers/iio/temperature/tmp007.c @@ -1,12 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * tmp007.c - Support for TI TMP007 IR thermopile sensor with integrated math engine * * Copyright (c) 2017 Manivannan Sadhasivam <manivannanece23@gmail.com> * - * This file is subject to the terms and conditions of version 2 of - * the GNU General Public License. See the file COPYING in the main - * directory of this archive for more details. - * * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor * * (7-bit I2C slave address (0x40 - 0x47), changeable via ADR pins) @@ -15,7 +12,6 @@ * 1. This driver assumes that the sensor has been calibrated beforehand * 2. Limit threshold events are enabled at the start * 3. Operating mode: INT - * */ #include <linux/err.h> diff --git a/drivers/iio/temperature/tsys01.c b/drivers/iio/temperature/tsys01.c index 3799d007c8e7..d41f050c2fea 100644 --- a/drivers/iio/temperature/tsys01.c +++ b/drivers/iio/temperature/tsys01.c @@ -1,10 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * tsys01.c - Support for Measurement-Specialties tsys01 temperature sensor * * Copyright (c) 2015 Measurement-Specialties * - * Licensed under the GPL-2. - * * Datasheet: * http://www.meas-spec.com/downloads/TSYS01_Digital_Temperature_Sensor.pdf */ diff --git a/drivers/iio/temperature/tsys02d.c b/drivers/iio/temperature/tsys02d.c index 9b2e56fa5fd5..6735af400b22 100644 --- a/drivers/iio/temperature/tsys02d.c +++ b/drivers/iio/temperature/tsys02d.c @@ -1,10 +1,9 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * tsys02d.c - Support for Measurement-Specialties tsys02d temperature sensor * * Copyright (c) 2015 Measurement-Specialties * - * Licensed under the GPL-2. - * * (7-bit I2C slave address 0x40) * * Datasheet: |