-
Notifications
You must be signed in to change notification settings - Fork 0
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
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>
- Loading branch information
Puranjay Mohan
authored and
Jonathan Cameron
committed
May 17, 2021
1 parent
5e713b2
commit df041e7
Showing
4 changed files
with
203 additions
and
0 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,185 @@ | ||
// SPDX-License-Identifier: GPL-2.0-only | ||
/* | ||
* Digital temperature sensor with integrated Non-volatile 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/bitops.h> | ||
#include <linux/types.h> | ||
#include <linux/kernel.h> | ||
#include <linux/limits.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 | ||
#define MICRODEGREE_PER_10MILLIDEGREE 10000 | ||
|
||
struct tmp117_data { | ||
struct i2c_client *client; | ||
s16 calibbias; | ||
}; | ||
|
||
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 = sign_extend32(ret, 15); | ||
return IIO_VAL_INT; | ||
|
||
case IIO_CHAN_INFO_SCALE: | ||
/* | ||
* Conversion from 10s of uC to mC | ||
* as IIO reports temperature in mC | ||
*/ | ||
*val = TMP117_RESOLUTION_10UC / MICRODEGREE_PER_10MILLIDEGREE; | ||
*val2 = (TMP117_RESOLUTION_10UC % | ||
MICRODEGREE_PER_10MILLIDEGREE) * 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 = clamp_t(int, val, S16_MIN, S16_MAX); | ||
if (off == data->calibbias) | ||
return 0; | ||
data->calibbias = off; | ||
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) | ||
{ | ||
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; | ||
data->calibbias = 0; | ||
|
||
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"); |