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@xxxxxxxxx> --- drivers/iio/temperature/Kconfig | 10 ++ drivers/iio/temperature/Makefile | 1 + drivers/iio/temperature/tmp117.c | 182 +++++++++++++++++++++++++++++++ 3 files changed, 193 insertions(+) create mode 100644 drivers/iio/temperature/tmp117.c 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..194820700 --- /dev/null +++ b/drivers/iio/temperature/tmp117.c @@ -0,0 +1,182 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * tmp117.c - Digital temperature sensor with integrated NV memory + * + * Copyright (c) 2021 Puranjay Mohan <puranjay12@xxxxxxxxx> + * + * 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/pm.h> +#include <linux/of.h> +#include <linux/irq.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.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_SCALE 7812500 /* in uCelsius*/ +#define TMP117_RESOLUTION 78125 +#define TMP117_DEVICE_ID 0x0117 + +struct tmp117_data { + struct i2c_client *client; + struct mutex lock; +}; + +static int tmp117_read_reg(struct tmp117_data *data, u8 reg) +{ + return i2c_smbus_read_word_swapped(data->client, reg); +} + +static int tmp117_write_reg(struct tmp117_data *data, u8 reg, int val) +{ + return i2c_smbus_write_word_swapped(data->client, reg, val); +} + +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); + u16 tmp, off; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + tmp = tmp117_read_reg(data, TMP117_REG_TEMP); + *val = tmp; + return IIO_VAL_INT; + + case IIO_CHAN_INFO_CALIBBIAS: + off = tmp117_read_reg(data, TMP117_REG_TEMP_OFFSET); + *val = ((int16_t)off * (int32_t)TMP117_RESOLUTION) / 10000000; + *val2 = ((int16_t)off * (int32_t)TMP117_RESOLUTION) % 10000000; + return IIO_VAL_INT_PLUS_MICRO; + + case IIO_CHAN_INFO_SCALE: + *val = 0; + *val2 = TMP117_SCALE; + return IIO_VAL_INT_PLUS_NANO; + + 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); + u16 off; + + switch (mask) { + case IIO_CHAN_INFO_CALIBBIAS: + off = ((val * 10000000) + (val2 * 10)) + / (int32_t)TMP117_RESOLUTION; + return tmp117_write_reg(data, 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 bool 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 false; + + return (dev_id == TMP117_DEVICE_ID); +} + +static int tmp117_probe(struct i2c_client *client, + const struct i2c_device_id *tmp117_id) +{ + struct tmp117_data *data; + struct iio_dev *indio_dev; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) + return -EOPNOTSUPP; + + if (!tmp117_identify(client)) { + dev_err(&client->dev, "TMP117 not found\n"); + return -ENODEV; + } + + 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 = of_match_ptr(tmp117_of_match), + }, + .probe = tmp117_probe, + .id_table = tmp117_id, +}; +module_i2c_driver(tmp117_driver); + +MODULE_AUTHOR("Puranjay Mohan <puranjay12@xxxxxxxxx>"); +MODULE_DESCRIPTION("TI TMP117 Temperature sensor driver"); +MODULE_LICENSE("GPL"); -- 2.30.1
