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    Subject[PATCH v2 2/2] iio: temperature: add driver support for ti tmp117
    Date
    TMP117 is a Digital temperature sensor with integrated NV 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>
    ---
    MAINTAINERS | 7 ++
    drivers/iio/temperature/Kconfig | 10 ++
    drivers/iio/temperature/Makefile | 1 +
    drivers/iio/temperature/tmp117.c | 179 +++++++++++++++++++++++++++++++
    4 files changed, 197 insertions(+)
    create mode 100644 drivers/iio/temperature/tmp117.c

    diff --git a/MAINTAINERS b/MAINTAINERS
    index 60ed2963e..c9b806b63 100644
    --- a/MAINTAINERS
    +++ b/MAINTAINERS
    @@ -16666,6 +16666,13 @@ F: include/dt-bindings/soc/ti,sci_pm_domain.h
    F: include/linux/soc/ti/ti_sci_inta_msi.h
    F: include/linux/soc/ti/ti_sci_protocol.h

    +TEXAS INSTRUMENTS' TMP117 TEMPERATURE SENSOR DRIVER
    +M: Puranjay Mohan <puranjay12@gmail.com>
    +L: linux-iio@vger.kernel.org
    +S: Supported
    +F: Documentation/devicetree/bindings/iio/temperature/ti,tmp117.yaml
    +F: drivers/iio/temperature/tmp117.c
    +
    THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER
    M: Hans Verkuil <hverkuil@xs4all.nl>
    L: linux-media@vger.kernel.org
    diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
    index f1f2a1499..c5482983f 100644
    --- a/drivers/iio/temperature/Kconfig
    +++ b/drivers/iio/temperature/Kconfig
    @@ -97,6 +97,16 @@ config TMP007
    This driver can also be built as a module. If so, the module will
    be called tmp007.

    +config TMP117
    + tristate "TMP117 Digital temperature sensor with integrated NV memory"
    + depends on I2C
    + help
    + If you say yes here you get support for the Texas Instruments
    + TMP117 Digital temperature sensor with integrated NV memory.
    +
    + This driver can also be built as a module. If so, the module will
    + be called tmp117.
    +
    config TSYS01
    tristate "Measurement Specialties TSYS01 temperature sensor using I2C bus connection"
    depends on I2C
    diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
    index 90c113115..e3392c4b2 100644
    --- a/drivers/iio/temperature/Makefile
    +++ b/drivers/iio/temperature/Makefile
    @@ -12,5 +12,6 @@ obj-$(CONFIG_MLX90614) += mlx90614.o
    obj-$(CONFIG_MLX90632) += mlx90632.o
    obj-$(CONFIG_TMP006) += tmp006.o
    obj-$(CONFIG_TMP007) += tmp007.o
    +obj-$(CONFIG_TMP117) += tmp117.o
    obj-$(CONFIG_TSYS01) += tsys01.o
    obj-$(CONFIG_TSYS02D) += tsys02d.o
    diff --git a/drivers/iio/temperature/tmp117.c b/drivers/iio/temperature/tmp117.c
    new file mode 100644
    index 000000000..83c0b856f
    --- /dev/null
    +++ b/drivers/iio/temperature/tmp117.c
    @@ -0,0 +1,179 @@
    +// SPDX-License-Identifier: GPL-2.0-only
    +/*
    + * tmp117.c - Digital temperature sensor with integrated NV memory
    + *
    + * Copyright (c) 2021 Puranjay Mohan <puranjay12@gmail.com>
    + *
    + * Driver for the Texas Instruments TMP117 Temperature Sensor
    + *
    + * (7-bit I2C slave address (0x48 - 0x4B), changeable via ADD pins)
    + *
    + * Note: This driver assumes that the sensor has been calibrated beforehand.
    + */
    +
    +#include <linux/err.h>
    +#include <linux/i2c.h>
    +#include <linux/module.h>
    +
    +#include <linux/iio/iio.h>
    +
    +#define TMP117_REG_TEMP 0x0
    +#define TMP117_REG_CFGR 0x1
    +#define TMP117_REG_HIGH_LIM 0x2
    +#define TMP117_REG_LOW_LIM 0x3
    +#define TMP117_REG_EEPROM_UL 0x4
    +#define TMP117_REG_EEPROM1 0x5
    +#define TMP117_REG_EEPROM2 0x6
    +#define TMP117_REG_TEMP_OFFSET 0x7
    +#define TMP117_REG_EEPROM3 0x8
    +#define TMP117_REG_DEVICE_ID 0xF
    +
    +#define TMP117_RESOLUTION_10UC 78125
    +#define TMP117_DEVICE_ID 0x0117
    +
    +struct tmp117_data {
    + struct i2c_client *client;
    +};
    +
    +static int tmp117_read_raw(struct iio_dev *indio_dev,
    + struct iio_chan_spec const *channel, int *val,
    + int *val2, long mask)
    +{
    + struct tmp117_data *data = iio_priv(indio_dev);
    + s32 ret;
    +
    + switch (mask) {
    + case IIO_CHAN_INFO_RAW:
    + ret = i2c_smbus_read_word_swapped(data->client,
    + TMP117_REG_TEMP);
    + if (ret < 0)
    + return ret;
    + *val = sign_extend32(ret, 15);
    + return IIO_VAL_INT;
    +
    + case IIO_CHAN_INFO_CALIBBIAS:
    + ret = i2c_smbus_read_word_swapped(data->client,
    + TMP117_REG_TEMP_OFFSET);
    + if (ret < 0)
    + return ret;
    + *val = ((int16_t)ret * (int32_t)TMP117_RESOLUTION_10UC)
    + / 10000;
    + *val2 = ((int16_t)ret * (int32_t)TMP117_RESOLUTION_10UC)
    + % 10000;
    + return IIO_VAL_INT_PLUS_MICRO;
    +
    + case IIO_CHAN_INFO_SCALE:
    + /* Conversion from 10s of uC to mC
    + * as IIO reports temperature in mC
    + */
    + *val = TMP117_RESOLUTION_10UC / 10000;
    + *val2 = (TMP117_RESOLUTION_10UC % 10000) * 100;
    + return IIO_VAL_INT_PLUS_MICRO;
    +
    + default:
    + return -EINVAL;
    + }
    +}
    +
    +static int tmp117_write_raw(struct iio_dev *indio_dev,
    + struct iio_chan_spec const *channel, int val,
    + int val2, long mask)
    +{
    + struct tmp117_data *data = iio_priv(indio_dev);
    + s16 off;
    +
    + switch (mask) {
    + case IIO_CHAN_INFO_CALIBBIAS:
    + off = (s16)val;
    + return i2c_smbus_write_word_swapped(data->client,
    + TMP117_REG_TEMP_OFFSET, off);
    +
    + default:
    + return -EINVAL;
    + }
    +}
    +
    +static const struct iio_chan_spec tmp117_channels[] = {
    + {
    + .type = IIO_TEMP,
    + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
    + BIT(IIO_CHAN_INFO_CALIBBIAS) | BIT(IIO_CHAN_INFO_SCALE),
    + },
    +};
    +
    +static const struct iio_info tmp117_info = {
    + .read_raw = tmp117_read_raw,
    + .write_raw = tmp117_write_raw,
    +};
    +
    +static int tmp117_identify(struct i2c_client *client)
    +{
    + int dev_id;
    +
    + dev_id = i2c_smbus_read_word_swapped(client, TMP117_REG_DEVICE_ID);
    + if (dev_id < 0)
    + return dev_id;
    + if (dev_id != TMP117_DEVICE_ID) {
    + dev_err(&client->dev, "TMP117 not found\n");
    + return -ENODEV;
    + }
    + return 0;
    +}
    +
    +static int tmp117_probe(struct i2c_client *client,
    + const struct i2c_device_id *tmp117_id)
    +{
    + struct tmp117_data *data;
    + struct iio_dev *indio_dev;
    + int ret;
    +
    + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
    + return -EOPNOTSUPP;
    +
    + ret = tmp117_identify(client);
    + if (ret < 0)
    + return ret;
    +
    + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
    + if (!indio_dev)
    + return -ENOMEM;
    +
    + data = iio_priv(indio_dev);
    + data->client = client;
    + mutex_init(&data->lock);
    +
    + indio_dev->name = "tmp117";
    + indio_dev->modes = INDIO_DIRECT_MODE;
    + indio_dev->info = &tmp117_info;
    +
    + indio_dev->channels = tmp117_channels;
    + indio_dev->num_channels = ARRAY_SIZE(tmp117_channels);
    +
    + return devm_iio_device_register(&client->dev, indio_dev);
    +}
    +
    +static const struct of_device_id tmp117_of_match[] = {
    + { .compatible = "ti,tmp117", },
    + { },
    +};
    +MODULE_DEVICE_TABLE(of, tmp117_of_match);
    +
    +static const struct i2c_device_id tmp117_id[] = {
    + { "tmp117", 0 },
    + { }
    +};
    +MODULE_DEVICE_TABLE(i2c, tmp117_id);
    +
    +static struct i2c_driver tmp117_driver = {
    + .driver = {
    + .name = "tmp117",
    + .of_match_table = tmp117_of_match,
    + },
    + .probe_new = tmp117_probe,
    + .id_table = tmp117_id,
    +};
    +module_i2c_driver(tmp117_driver);
    +
    +MODULE_AUTHOR("Puranjay Mohan <puranjay12@gmail.com>");
    +MODULE_DESCRIPTION("TI TMP117 Temperature sensor driver");
    +MODULE_LICENSE("GPL");
    --
    2.30.1
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