iio:temperature: Add support for TI TMP007 sensor
This patch adds support for TI TMP007 - 16 bit IR thermopile sensor with integrated Math engine. Sensor takes care of calculating the object temperature with the help of calibrated constants stored in non-volatile memory, thereby reducing the calculation overhead. Signed-off-by: Manivannan Sadhasivam <manivannanece23@gmail.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Manivannan Sadhasivam
Jonathan Cameron
parent
e30eca0e69
commit
948b707df8
4 changed files with 383 additions and 0 deletions
27
Documentation/devicetree/bindings/iio/temperature/tmp007.txt
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27
Documentation/devicetree/bindings/iio/temperature/tmp007.txt
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@ -0,0 +1,27 @@
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* TI TMP007 - IR thermopile sensor with integrated math engine
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Link to datasheet: http://www.ti.com/lit/ds/symlink/tmp007.pdf
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Required properties:
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- compatible: should be "ti,tmp007"
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- reg: the I2C address of the sensor (changeable via ADR pins)
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------------------------------
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|ADR1 | ADR0 | Device Address|
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------------------------------
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0 0 0x40
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0 1 0x41
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0 SDA 0x42
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0 SCL 0x43
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1 0 0x44
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1 1 0x45
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1 SDA 0x46
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1 SCL 0x47
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Example:
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tmp007@40 {
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compatible = "ti,tmp007";
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reg = <0x40>;
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};
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@ -39,6 +39,16 @@ config TMP006
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This driver can also be built as a module. If so, the module will
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be called tmp006.
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config TMP007
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tristate "TMP007 infrared thermopile sensor with Integrated Math Engine"
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depends on I2C
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help
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If you say yes here you get support for the Texas Instruments
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TMP007 infrared thermopile sensor with Integrated Math Engine.
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This driver can also be built as a module. If so, the module will
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be called tmp007.
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config TSYS01
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tristate "Measurement Specialties TSYS01 temperature sensor using I2C bus connection"
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depends on I2C
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@ -5,5 +5,6 @@
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obj-$(CONFIG_MAXIM_THERMOCOUPLE) += maxim_thermocouple.o
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obj-$(CONFIG_MLX90614) += mlx90614.o
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obj-$(CONFIG_TMP006) += tmp006.o
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obj-$(CONFIG_TMP007) += tmp007.o
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obj-$(CONFIG_TSYS01) += tsys01.o
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obj-$(CONFIG_TSYS02D) += tsys02d.o
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345
drivers/iio/temperature/tmp007.c
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345
drivers/iio/temperature/tmp007.c
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@ -0,0 +1,345 @@
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/*
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* tmp007.c - Support for TI TMP007 IR thermopile sensor with integrated math engine
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*
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* Copyright (c) 2017 Manivannan Sadhasivam <manivannanece23@gmail.com>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
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*
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* (7-bit I2C slave address (0x40 - 0x47), changeable via ADR pins)
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*
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* Note: This driver assumes that the sensor has been calibrated beforehand
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*
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* TODO: ALERT irq, limit threshold events
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*
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/bitops.h>
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#include <linux/of.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#define TMP007_TDIE 0x01
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#define TMP007_CONFIG 0x02
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#define TMP007_TOBJECT 0x03
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#define TMP007_STATUS 0x04
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#define TMP007_STATUS_MASK 0x05
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#define TMP007_MANUFACTURER_ID 0x1e
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#define TMP007_DEVICE_ID 0x1f
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#define TMP007_CONFIG_CONV_EN BIT(12)
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#define TMP007_CONFIG_COMP_EN BIT(5)
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#define TMP007_CONFIG_TC_EN BIT(6)
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#define TMP007_CONFIG_CR_MASK GENMASK(11, 9)
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#define TMP007_CONFIG_CR_SHIFT 9
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#define TMP007_STATUS_CONV_READY BIT(14)
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#define TMP007_STATUS_DATA_VALID BIT(9)
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#define TMP007_MANUFACTURER_MAGIC 0x5449
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#define TMP007_DEVICE_MAGIC 0x0078
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#define TMP007_TEMP_SHIFT 2
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struct tmp007_data {
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struct i2c_client *client;
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u16 config;
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};
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static const int tmp007_avgs[5][2] = { {4, 0}, {2, 0}, {1, 0},
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{0, 500000}, {0, 250000} };
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static int tmp007_read_temperature(struct tmp007_data *data, u8 reg)
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{
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s32 ret;
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int tries = 50;
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while (tries-- > 0) {
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ret = i2c_smbus_read_word_swapped(data->client,
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TMP007_STATUS);
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if (ret < 0)
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return ret;
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if ((ret & TMP007_STATUS_CONV_READY) &&
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!(ret & TMP007_STATUS_DATA_VALID))
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break;
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msleep(100);
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}
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if (tries < 0)
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return -EIO;
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return i2c_smbus_read_word_swapped(data->client, reg);
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}
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static int tmp007_powerdown(struct tmp007_data *data)
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{
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return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
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data->config & ~TMP007_CONFIG_CONV_EN);
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}
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static int tmp007_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *channel, int *val,
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int *val2, long mask)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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s32 ret;
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int conv_rate;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (channel->channel2) {
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case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.03125 degree Celsius */
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_TDIE);
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if (ret < 0)
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return ret;
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break;
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case IIO_MOD_TEMP_OBJECT:
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ret = tmp007_read_temperature(data, TMP007_TOBJECT);
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if (ret < 0)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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*val = sign_extend32(ret, 15) >> TMP007_TEMP_SHIFT;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 31;
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*val2 = 250000;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SAMP_FREQ:
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conv_rate = (data->config & TMP007_CONFIG_CR_MASK)
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>> TMP007_CONFIG_CR_SHIFT;
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*val = tmp007_avgs[conv_rate][0];
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*val2 = tmp007_avgs[conv_rate][1];
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int tmp007_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *channel, int val,
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int val2, long mask)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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int i;
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u16 tmp;
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if (mask == IIO_CHAN_INFO_SAMP_FREQ) {
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for (i = 0; i < ARRAY_SIZE(tmp007_avgs); i++) {
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if ((val == tmp007_avgs[i][0]) &&
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(val2 == tmp007_avgs[i][1])) {
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tmp = data->config & ~TMP007_CONFIG_CR_MASK;
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tmp |= (i << TMP007_CONFIG_CR_SHIFT);
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return i2c_smbus_write_word_swapped(data->client,
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TMP007_CONFIG,
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data->config = tmp);
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}
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}
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}
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return -EINVAL;
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}
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static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
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static struct attribute *tmp007_attributes[] = {
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group tmp007_attribute_group = {
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.attrs = tmp007_attributes,
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};
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static const struct iio_chan_spec tmp007_channels[] = {
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{
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.type = IIO_TEMP,
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.modified = 1,
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.channel2 = IIO_MOD_TEMP_AMBIENT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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},
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{
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.type = IIO_TEMP,
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.modified = 1,
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.channel2 = IIO_MOD_TEMP_OBJECT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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}
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};
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static const struct iio_info tmp007_info = {
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.read_raw = tmp007_read_raw,
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.write_raw = tmp007_write_raw,
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.attrs = &tmp007_attribute_group,
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.driver_module = THIS_MODULE,
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};
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static bool tmp007_identify(struct i2c_client *client)
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{
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int manf_id, dev_id;
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manf_id = i2c_smbus_read_word_swapped(client, TMP007_MANUFACTURER_ID);
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if (manf_id < 0)
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return false;
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dev_id = i2c_smbus_read_word_swapped(client, TMP007_DEVICE_ID);
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if (dev_id < 0)
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return false;
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return (manf_id == TMP007_MANUFACTURER_MAGIC && dev_id == TMP007_DEVICE_MAGIC);
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}
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static int tmp007_probe(struct i2c_client *client,
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const struct i2c_device_id *tmp007_id)
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{
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struct tmp007_data *data;
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struct iio_dev *indio_dev;
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int ret;
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u16 status;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
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return -EOPNOTSUPP;
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if (!tmp007_identify(client)) {
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dev_err(&client->dev, "TMP007 not found\n");
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return -ENODEV;
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}
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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indio_dev->dev.parent = &client->dev;
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indio_dev->name = dev_name(&client->dev);
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &tmp007_info;
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indio_dev->channels = tmp007_channels;
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indio_dev->num_channels = ARRAY_SIZE(tmp007_channels);
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/*
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* Set Configuration register:
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* 1. Conversion ON
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* 2. Comparator mode
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* 3. Transient correction enable
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*/
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_CONFIG);
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if (ret < 0)
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return ret;
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data->config = ret;
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data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_COMP_EN | TMP007_CONFIG_TC_EN);
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ret = i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
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data->config);
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if (ret < 0)
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return ret;
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/*
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* Set Status Mask register:
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* 1. Conversion ready enable
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* 2. Data valid enable
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*/
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
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if (ret < 0)
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goto error_powerdown;
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status = ret;
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status |= (TMP007_STATUS_CONV_READY | TMP007_STATUS_DATA_VALID);
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ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, status);
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if (ret < 0)
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goto error_powerdown;
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return iio_device_register(indio_dev);
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error_powerdown:
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tmp007_powerdown(data);
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return ret;
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}
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static int tmp007_remove(struct i2c_client *client)
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{
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struct iio_dev *indio_dev = i2c_get_clientdata(client);
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struct tmp007_data *data = iio_priv(indio_dev);
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iio_device_unregister(indio_dev);
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tmp007_powerdown(data);
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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static int tmp007_suspend(struct device *dev)
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{
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struct tmp007_data *data = iio_priv(i2c_get_clientdata(
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to_i2c_client(dev)));
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return tmp007_powerdown(data);
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}
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static int tmp007_resume(struct device *dev)
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{
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struct tmp007_data *data = iio_priv(i2c_get_clientdata(
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to_i2c_client(dev)));
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return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
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data->config | TMP007_CONFIG_CONV_EN);
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}
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#endif
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static SIMPLE_DEV_PM_OPS(tmp007_pm_ops, tmp007_suspend, tmp007_resume);
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static const struct of_device_id tmp007_of_match[] = {
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{ .compatible = "ti,tmp007", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, tmp007_of_match);
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static const struct i2c_device_id tmp007_id[] = {
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{ "tmp007", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tmp007_id);
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static struct i2c_driver tmp007_driver = {
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.driver = {
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.name = "tmp007",
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.of_match_table = of_match_ptr(tmp007_of_match),
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.pm = &tmp007_pm_ops,
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},
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.probe = tmp007_probe,
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.remove = tmp007_remove,
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.id_table = tmp007_id,
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};
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module_i2c_driver(tmp007_driver);
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MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@gmail.com>");
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MODULE_DESCRIPTION("TI TMP007 IR thermopile sensor driver");
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MODULE_LICENSE("GPL");
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