forked from Minki/linux
iio: temperature: add driver support for ti tmp117
TMP117 is a Digital temperature sensor with integrated Non-Volatile memory. Add support for tmp117 driver in iio subsystem. Datasheet: https://www.ti.com/lit/gpn/tmp117 Signed-off-by: Puranjay Mohan <puranjay12@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20210407182147.77221-3-puranjay12@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Puranjay Mohan
Jonathan Cameron
parent
5e713b25d1
commit
df041e737a
@ -18094,6 +18094,13 @@ F: Documentation/devicetree/bindings/hwmon/ti,tps23861.yaml
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F: Documentation/hwmon/tps23861.rst
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F: drivers/hwmon/tps23861.c
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TEXAS INSTRUMENTS' TMP117 TEMPERATURE SENSOR DRIVER
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M: Puranjay Mohan <puranjay12@gmail.com>
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L: linux-iio@vger.kernel.org
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S: Supported
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F: Documentation/devicetree/bindings/iio/temperature/ti,tmp117.yaml
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F: drivers/iio/temperature/tmp117.c
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THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER
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M: Hans Verkuil <hverkuil@xs4all.nl>
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L: linux-media@vger.kernel.org
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@ -96,6 +96,16 @@ config TMP007
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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 TMP117
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tristate "TMP117 Digital temperature sensor with integrated NV memory"
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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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TMP117 Digital temperature sensor with integrated NV memory.
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This driver can also be built as a module. If so, the module will
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be called tmp117.
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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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@ -12,5 +12,6 @@ obj-$(CONFIG_MLX90614) += mlx90614.o
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obj-$(CONFIG_MLX90632) += mlx90632.o
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obj-$(CONFIG_TMP006) += tmp006.o
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obj-$(CONFIG_TMP007) += tmp007.o
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obj-$(CONFIG_TMP117) += tmp117.o
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obj-$(CONFIG_TSYS01) += tsys01.o
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obj-$(CONFIG_TSYS02D) += tsys02d.o
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185
drivers/iio/temperature/tmp117.c
Normal file
185
drivers/iio/temperature/tmp117.c
Normal file
@ -0,0 +1,185 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Digital temperature sensor with integrated Non-volatile memory
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* Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
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*
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* Driver for the Texas Instruments TMP117 Temperature Sensor
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* (7-bit I2C slave address (0x48 - 0x4B), changeable via ADD 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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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/limits.h>
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#include <linux/iio/iio.h>
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#define TMP117_REG_TEMP 0x0
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#define TMP117_REG_CFGR 0x1
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#define TMP117_REG_HIGH_LIM 0x2
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#define TMP117_REG_LOW_LIM 0x3
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#define TMP117_REG_EEPROM_UL 0x4
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#define TMP117_REG_EEPROM1 0x5
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#define TMP117_REG_EEPROM2 0x6
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#define TMP117_REG_TEMP_OFFSET 0x7
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#define TMP117_REG_EEPROM3 0x8
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#define TMP117_REG_DEVICE_ID 0xF
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#define TMP117_RESOLUTION_10UC 78125
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#define TMP117_DEVICE_ID 0x0117
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#define MICRODEGREE_PER_10MILLIDEGREE 10000
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struct tmp117_data {
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struct i2c_client *client;
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s16 calibbias;
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};
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static int tmp117_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 tmp117_data *data = iio_priv(indio_dev);
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s32 ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = i2c_smbus_read_word_swapped(data->client,
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TMP117_REG_TEMP);
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if (ret < 0)
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return ret;
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*val = sign_extend32(ret, 15);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_CALIBBIAS:
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ret = i2c_smbus_read_word_swapped(data->client,
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TMP117_REG_TEMP_OFFSET);
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if (ret < 0)
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return ret;
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*val = sign_extend32(ret, 15);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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/*
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* Conversion from 10s of uC to mC
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* as IIO reports temperature in mC
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*/
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*val = TMP117_RESOLUTION_10UC / MICRODEGREE_PER_10MILLIDEGREE;
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*val2 = (TMP117_RESOLUTION_10UC %
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MICRODEGREE_PER_10MILLIDEGREE) * 100;
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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 tmp117_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 tmp117_data *data = iio_priv(indio_dev);
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s16 off;
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switch (mask) {
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case IIO_CHAN_INFO_CALIBBIAS:
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off = clamp_t(int, val, S16_MIN, S16_MAX);
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if (off == data->calibbias)
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return 0;
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data->calibbias = off;
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return i2c_smbus_write_word_swapped(data->client,
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TMP117_REG_TEMP_OFFSET, off);
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default:
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return -EINVAL;
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}
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}
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static const struct iio_chan_spec tmp117_channels[] = {
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_SCALE),
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},
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};
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static const struct iio_info tmp117_info = {
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.read_raw = tmp117_read_raw,
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.write_raw = tmp117_write_raw,
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};
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static int tmp117_identify(struct i2c_client *client)
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{
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int dev_id;
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dev_id = i2c_smbus_read_word_swapped(client, TMP117_REG_DEVICE_ID);
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if (dev_id < 0)
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return dev_id;
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if (dev_id != TMP117_DEVICE_ID) {
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dev_err(&client->dev, "TMP117 not found\n");
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return -ENODEV;
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}
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return 0;
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}
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static int tmp117_probe(struct i2c_client *client)
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{
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struct tmp117_data *data;
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struct iio_dev *indio_dev;
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int ret;
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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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ret = tmp117_identify(client);
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if (ret < 0)
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return ret;
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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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data->client = client;
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data->calibbias = 0;
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indio_dev->name = "tmp117";
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &tmp117_info;
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indio_dev->channels = tmp117_channels;
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indio_dev->num_channels = ARRAY_SIZE(tmp117_channels);
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static const struct of_device_id tmp117_of_match[] = {
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{ .compatible = "ti,tmp117", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, tmp117_of_match);
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static const struct i2c_device_id tmp117_id[] = {
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{ "tmp117", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tmp117_id);
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static struct i2c_driver tmp117_driver = {
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.driver = {
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.name = "tmp117",
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.of_match_table = tmp117_of_match,
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},
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.probe_new = tmp117_probe,
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.id_table = tmp117_id,
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};
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module_i2c_driver(tmp117_driver);
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MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
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MODULE_DESCRIPTION("TI TMP117 Temperature sensor driver");
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MODULE_LICENSE("GPL");
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