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linux/drivers/hwmon/tmp108.c
Mayank Mahajan 72037c4128 hwmon: (tmp108) Add support for P3T1035 and P3T2030 
Add support for the P3T1035 & P3T2030 temperature sensor. While mostly
compatible with the TMP108, P3T1035 uses an 8-bit configuration register
instead of the 16-bit layout used by TMP108. Updated driver to handle
this difference during configuration read/write.

Signed-off-by: Mayank Mahajan <mayankmahajan.x@nxp.com>
Link: https://lore.kernel.org/r/20260119040459.2898998-2-mayankmahajan.x@nxp.com
[groeck: Reordered include files to retain alphabetic order]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2026-01-31 07:38:33 -08:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/* Texas Instruments TMP108 SMBus temperature sensor driver
*
* Copyright (C) 2016 John Muir <john@jmuir.com>
*/
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/hwmon.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/i3c/device.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/util_macros.h>
#define DRIVER_NAME "tmp108"
#define TMP108_REG_TEMP 0x00
#define TMP108_REG_CONF 0x01
#define TMP108_REG_TLOW 0x02
#define TMP108_REG_THIGH 0x03
#define TMP108_TEMP_MIN_MC -50000 /* Minimum millicelcius. */
#define TMP108_TEMP_MAX_MC 127937 /* Maximum millicelcius. */
/* Configuration register bits.
* Note: these bit definitions are byte swapped.
*/
#define TMP108_CONF_M0 0x0100 /* Sensor mode. */
#define TMP108_CONF_M1 0x0200
#define TMP108_CONF_TM 0x0400 /* Thermostat mode. */
#define TMP108_CONF_FL 0x0800 /* Watchdog flag - TLOW */
#define TMP108_CONF_FH 0x1000 /* Watchdog flag - THIGH */
#define TMP108_CONF_CR0 0x2000 /* Conversion rate. */
#define TMP108_CONF_CR1 0x4000
#define TMP108_CONF_ID 0x8000
#define TMP108_CONF_HYS0 0x0010 /* Hysteresis. */
#define TMP108_CONF_HYS1 0x0020
#define TMP108_CONF_POL 0x0080 /* Polarity of alert. */
/* Defaults set by the hardware upon reset. */
#define TMP108_CONF_DEFAULTS (TMP108_CONF_CR0 | TMP108_CONF_TM |\
TMP108_CONF_HYS0 | TMP108_CONF_M1)
/* These bits are read-only. */
#define TMP108_CONF_READ_ONLY (TMP108_CONF_FL | TMP108_CONF_FH |\
TMP108_CONF_ID)
#define TMP108_CONF_MODE_MASK (TMP108_CONF_M0|TMP108_CONF_M1)
#define TMP108_MODE_SHUTDOWN 0x0000
#define TMP108_MODE_ONE_SHOT TMP108_CONF_M0
#define TMP108_MODE_CONTINUOUS TMP108_CONF_M1 /* Default */
/* When M1 is set, M0 is ignored. */
#define TMP108_CONF_CONVRATE_MASK (TMP108_CONF_CR0|TMP108_CONF_CR1)
#define TMP108_CONVRATE_0P25HZ 0x0000
#define TMP108_CONVRATE_1HZ TMP108_CONF_CR0 /* Default */
#define TMP108_CONVRATE_4HZ TMP108_CONF_CR1
#define TMP108_CONVRATE_16HZ (TMP108_CONF_CR0|TMP108_CONF_CR1)
#define TMP108_CONF_HYSTERESIS_MASK (TMP108_CONF_HYS0|TMP108_CONF_HYS1)
#define TMP108_HYSTERESIS_0C 0x0000
#define TMP108_HYSTERESIS_1C TMP108_CONF_HYS0 /* Default */
#define TMP108_HYSTERESIS_2C TMP108_CONF_HYS1
#define TMP108_HYSTERESIS_4C (TMP108_CONF_HYS0|TMP108_CONF_HYS1)
#define TMP108_CONVERSION_TIME_MS 30 /* in milli-seconds */
#define TMP108_CONF_CR0_POS 13
#define TMP108_CONF_CR1_POS 14
#define TMP108_CONF_CONVRATE_FLD GENMASK(TMP108_CONF_CR1_POS, TMP108_CONF_CR0_POS)
struct tmp108 {
struct regmap *regmap;
u16 orig_config;
unsigned long ready_time;
const struct tmp108_params *params;
};
struct tmp108_params {
bool config_reg_16bits;
const u16 *sample_times;
size_t n_sample_times;
};
static const u16 p3t1035_sample_times[] = {4000, 1000, 250, 125};
static const u16 tmp108_sample_times[] = {4000, 1000, 250, 63};
static const struct tmp108_params p3t1035_data = {
.sample_times = p3t1035_sample_times,
.n_sample_times = ARRAY_SIZE(p3t1035_sample_times),
.config_reg_16bits = false,
};
static const struct tmp108_params tmp108_data = {
.sample_times = tmp108_sample_times,
.n_sample_times = ARRAY_SIZE(tmp108_sample_times),
.config_reg_16bits = true,
};
/* convert 12-bit TMP108 register value to milliCelsius */
static inline int tmp108_temp_reg_to_mC(s16 val)
{
return (val & ~0x0f) * 1000 / 256;
}
/* convert milliCelsius to left adjusted 12-bit TMP108 register value */
static inline u16 tmp108_mC_to_temp_reg(int val)
{
return (val * 256) / 1000;
}
static int tmp108_read(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long *temp)
{
struct tmp108 *tmp108 = dev_get_drvdata(dev);
unsigned int regval;
int err, hyst;
if (type == hwmon_chip) {
if (attr == hwmon_chip_update_interval) {
err = regmap_read(tmp108->regmap, TMP108_REG_CONF,
&regval);
if (err < 0)
return err;
*temp = tmp108->params->sample_times[FIELD_GET(TMP108_CONF_CONVRATE_FLD,
regval)];
return 0;
}
return -EOPNOTSUPP;
}
switch (attr) {
case hwmon_temp_input:
/* Is it too early to return a conversion ? */
if (time_before(jiffies, tmp108->ready_time)) {
dev_dbg(dev, "%s: Conversion not ready yet..\n",
__func__);
return -EAGAIN;
}
err = regmap_read(tmp108->regmap, TMP108_REG_TEMP, &regval);
if (err < 0)
return err;
*temp = tmp108_temp_reg_to_mC(regval);
break;
case hwmon_temp_min:
case hwmon_temp_max:
err = regmap_read(tmp108->regmap, attr == hwmon_temp_min ?
TMP108_REG_TLOW : TMP108_REG_THIGH, &regval);
if (err < 0)
return err;
*temp = tmp108_temp_reg_to_mC(regval);
break;
case hwmon_temp_min_alarm:
case hwmon_temp_max_alarm:
err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &regval);
if (err < 0)
return err;
*temp = !!(regval & (attr == hwmon_temp_min_alarm ?
TMP108_CONF_FL : TMP108_CONF_FH));
break;
case hwmon_temp_min_hyst:
case hwmon_temp_max_hyst:
err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &regval);
if (err < 0)
return err;
switch (regval & TMP108_CONF_HYSTERESIS_MASK) {
case TMP108_HYSTERESIS_0C:
default:
hyst = 0;
break;
case TMP108_HYSTERESIS_1C:
hyst = 1000;
break;
case TMP108_HYSTERESIS_2C:
hyst = 2000;
break;
case TMP108_HYSTERESIS_4C:
hyst = 4000;
break;
}
err = regmap_read(tmp108->regmap, attr == hwmon_temp_min_hyst ?
TMP108_REG_TLOW : TMP108_REG_THIGH, &regval);
if (err < 0)
return err;
*temp = tmp108_temp_reg_to_mC(regval);
if (attr == hwmon_temp_min_hyst)
*temp += hyst;
else
*temp -= hyst;
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long temp)
{
struct tmp108 *tmp108 = dev_get_drvdata(dev);
u32 regval, mask;
size_t len;
u8 index;
int err;
if (type == hwmon_chip) {
if (attr == hwmon_chip_update_interval) {
len = tmp108->params->n_sample_times;
index = find_closest_descending(temp, tmp108->params->sample_times, len);
return regmap_update_bits(tmp108->regmap,
TMP108_REG_CONF,
TMP108_CONF_CONVRATE_MASK,
FIELD_PREP(TMP108_CONF_CONVRATE_FLD, index));
}
return -EOPNOTSUPP;
}
switch (attr) {
case hwmon_temp_min:
case hwmon_temp_max:
temp = clamp_val(temp, TMP108_TEMP_MIN_MC, TMP108_TEMP_MAX_MC);
return regmap_write(tmp108->regmap,
attr == hwmon_temp_min ?
TMP108_REG_TLOW : TMP108_REG_THIGH,
tmp108_mC_to_temp_reg(temp));
case hwmon_temp_min_hyst:
case hwmon_temp_max_hyst:
temp = clamp_val(temp, TMP108_TEMP_MIN_MC, TMP108_TEMP_MAX_MC);
err = regmap_read(tmp108->regmap,
attr == hwmon_temp_min_hyst ?
TMP108_REG_TLOW : TMP108_REG_THIGH,
&regval);
if (err < 0)
return err;
if (attr == hwmon_temp_min_hyst)
temp -= tmp108_temp_reg_to_mC(regval);
else
temp = tmp108_temp_reg_to_mC(regval) - temp;
if (temp < 500)
mask = TMP108_HYSTERESIS_0C;
else if (temp < 1500)
mask = TMP108_HYSTERESIS_1C;
else if (temp < 3000)
mask = TMP108_HYSTERESIS_2C;
else
mask = TMP108_HYSTERESIS_4C;
return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
TMP108_CONF_HYSTERESIS_MASK, mask);
default:
return -EOPNOTSUPP;
}
}
static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
const struct tmp108 *tmp108 = data;
if (type == hwmon_chip && attr == hwmon_chip_update_interval)
return 0644;
if (type != hwmon_temp)
return 0;
switch (attr) {
case hwmon_temp_input:
case hwmon_temp_min_alarm:
case hwmon_temp_max_alarm:
return 0444;
case hwmon_temp_min:
case hwmon_temp_max:
return 0644;
case hwmon_temp_min_hyst:
case hwmon_temp_max_hyst:
if (!tmp108->params->config_reg_16bits)
return 0;
return 0644;
default:
return 0;
}
}
static const struct hwmon_channel_info * const tmp108_info[] = {
HWMON_CHANNEL_INFO(chip,
HWMON_C_REGISTER_TZ | HWMON_C_UPDATE_INTERVAL),
HWMON_CHANNEL_INFO(temp,
HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MIN |
HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |
HWMON_T_MIN_ALARM | HWMON_T_MAX_ALARM),
NULL
};
static const struct hwmon_ops tmp108_hwmon_ops = {
.is_visible = tmp108_is_visible,
.read = tmp108_read,
.write = tmp108_write,
};
static const struct hwmon_chip_info tmp108_chip_info = {
.ops = &tmp108_hwmon_ops,
.info = tmp108_info,
};
static void tmp108_restore_config(void *data)
{
struct tmp108 *tmp108 = data;
regmap_write(tmp108->regmap, TMP108_REG_CONF, tmp108->orig_config);
}
static bool tmp108_is_writeable_reg(struct device *dev, unsigned int reg)
{
return reg != TMP108_REG_TEMP;
}
static bool tmp108_is_volatile_reg(struct device *dev, unsigned int reg)
{
/* Configuration register must be volatile to enable FL and FH. */
return reg == TMP108_REG_TEMP || reg == TMP108_REG_CONF;
}
static int tmp108_i2c_reg_read(void *context, unsigned int reg, unsigned int *val)
{
struct i2c_client *client = context;
struct tmp108 *tmp108 = i2c_get_clientdata(client);
int ret;
if (reg == TMP108_REG_CONF && !tmp108->params->config_reg_16bits) {
ret = i2c_smbus_read_byte_data(client, TMP108_REG_CONF);
if (ret < 0)
return ret;
*val = ret << 8;
return 0;
}
ret = i2c_smbus_read_word_swapped(client, reg);
if (ret < 0)
return ret;
*val = ret;
return 0;
}
static int tmp108_i2c_reg_write(void *context, unsigned int reg, unsigned int val)
{
struct i2c_client *client = context;
struct tmp108 *tmp108 = i2c_get_clientdata(client);
if (reg == TMP108_REG_CONF && !tmp108->params->config_reg_16bits)
return i2c_smbus_write_byte_data(client, reg, val >> 8);
return i2c_smbus_write_word_swapped(client, reg, val);
}
static const struct regmap_bus tmp108_i2c_regmap_bus = {
.reg_read = tmp108_i2c_reg_read,
.reg_write = tmp108_i2c_reg_write,
};
static int tmp108_i3c_reg_read(void *context, unsigned int reg, unsigned int *val)
{
struct i3c_device *i3cdev = context;
struct tmp108 *tmp108 = i3cdev_get_drvdata(i3cdev);
u8 reg_buf[1], val_buf[2];
struct i3c_xfer xfers[] = {
{
.rnw = false,
.len = 1,
.data.out = reg_buf,
},
{
.rnw = true,
.len = 2,
.data.in = val_buf,
},
};
int ret;
reg_buf[0] = reg;
if (reg == TMP108_REG_CONF && !tmp108->params->config_reg_16bits)
xfers[1].len--;
ret = i3c_device_do_xfers(i3cdev, xfers, 2, I3C_SDR);
if (ret < 0)
return ret;
*val = val_buf[0] << 8;
if (reg != TMP108_REG_CONF || tmp108->params->config_reg_16bits)
*val |= val_buf[1];
return 0;
}
static int tmp108_i3c_reg_write(void *context, unsigned int reg, unsigned int val)
{
struct i3c_device *i3cdev = context;
struct tmp108 *tmp108 = i3cdev_get_drvdata(i3cdev);
u8 val_buf[3];
struct i3c_xfer xfers[] = {
{
.rnw = false,
.len = 3,
.data.out = val_buf,
},
};
val_buf[0] = reg;
val_buf[1] = (val >> 8) & 0xff;
if (reg == TMP108_REG_CONF && !tmp108->params->config_reg_16bits)
xfers[0].len--;
else
val_buf[2] = val & 0xff;
return i3c_device_do_xfers(i3cdev, xfers, 1, I3C_SDR);
}
static const struct regmap_bus tmp108_i3c_regmap_bus = {
.reg_read = tmp108_i3c_reg_read,
.reg_write = tmp108_i3c_reg_write,
};
static const struct regmap_config tmp108_regmap_config = {
.reg_bits = 8,
.val_bits = 16,
.max_register = TMP108_REG_THIGH,
.writeable_reg = tmp108_is_writeable_reg,
.volatile_reg = tmp108_is_volatile_reg,
.val_format_endian = REGMAP_ENDIAN_BIG,
.cache_type = REGCACHE_MAPLE,
.use_single_read = true,
.use_single_write = true,
};
static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name,
const struct tmp108_params *params)
{
struct device *hwmon_dev;
struct tmp108 *tmp108;
u32 config;
int err;
err = devm_regulator_get_enable(dev, "vcc");
if (err)
return dev_err_probe(dev, err, "Failed to enable regulator\n");
tmp108 = devm_kzalloc(dev, sizeof(*tmp108), GFP_KERNEL);
if (!tmp108)
return -ENOMEM;
dev_set_drvdata(dev, tmp108);
tmp108->regmap = regmap;
tmp108->params = params;
err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &config);
if (err < 0) {
dev_err(dev, "error reading config register: %d", err);
return err;
}
tmp108->orig_config = config;
/* Only continuous mode is supported. */
config &= ~TMP108_CONF_MODE_MASK;
config |= TMP108_MODE_CONTINUOUS;
/* Only comparator mode is supported. */
config &= ~TMP108_CONF_TM;
err = regmap_write(tmp108->regmap, TMP108_REG_CONF, config);
if (err < 0) {
dev_err(dev, "error writing config register: %d", err);
return err;
}
tmp108->ready_time = jiffies;
if ((tmp108->orig_config & TMP108_CONF_MODE_MASK) ==
TMP108_MODE_SHUTDOWN)
tmp108->ready_time +=
msecs_to_jiffies(TMP108_CONVERSION_TIME_MS);
err = devm_add_action_or_reset(dev, tmp108_restore_config, tmp108);
if (err) {
dev_err(dev, "add action or reset failed: %d", err);
return err;
}
hwmon_dev = devm_hwmon_device_register_with_info(dev, name,
tmp108,
&tmp108_chip_info,
NULL);
return PTR_ERR_OR_ZERO(hwmon_dev);
}
static int tmp108_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct regmap *regmap;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA))
return dev_err_probe(dev, -ENODEV,
"adapter doesn't support SMBus word transactions\n");
regmap = devm_regmap_init(dev, &tmp108_i2c_regmap_bus, client, &tmp108_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap), "regmap init failed");
return tmp108_common_probe(dev, regmap, client->name, i2c_get_match_data(client));
}
static int tmp108_suspend(struct device *dev)
{
struct tmp108 *tmp108 = dev_get_drvdata(dev);
return regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
TMP108_CONF_MODE_MASK, TMP108_MODE_SHUTDOWN);
}
static int tmp108_resume(struct device *dev)
{
struct tmp108 *tmp108 = dev_get_drvdata(dev);
int err;
err = regmap_update_bits(tmp108->regmap, TMP108_REG_CONF,
TMP108_CONF_MODE_MASK, TMP108_MODE_CONTINUOUS);
tmp108->ready_time = jiffies +
msecs_to_jiffies(TMP108_CONVERSION_TIME_MS);
return err;
}
static DEFINE_SIMPLE_DEV_PM_OPS(tmp108_dev_pm_ops, tmp108_suspend, tmp108_resume);
static const struct i2c_device_id tmp108_i2c_ids[] = {
{ "p3t1035", (unsigned long)&p3t1035_data },
{ "p3t1085", (unsigned long)&tmp108_data },
{ "tmp108", (unsigned long)&tmp108_data },
{}
};
MODULE_DEVICE_TABLE(i2c, tmp108_i2c_ids);
static const struct of_device_id tmp108_of_ids[] = {
{ .compatible = "nxp,p3t1035", .data = &p3t1035_data },
{ .compatible = "nxp,p3t1085", .data = &tmp108_data },
{ .compatible = "ti,tmp108", .data = &tmp108_data },
{}
};
MODULE_DEVICE_TABLE(of, tmp108_of_ids);
static struct i2c_driver tmp108_driver = {
.driver = {
.name = DRIVER_NAME,
.pm = pm_sleep_ptr(&tmp108_dev_pm_ops),
.of_match_table = tmp108_of_ids,
},
.probe = tmp108_probe,
.id_table = tmp108_i2c_ids,
};
static const struct i3c_device_id p3t1085_i3c_ids[] = {
I3C_DEVICE(0x011B, 0x1529, &tmp108_data),
I3C_DEVICE(0x011B, 0x152B, &p3t1035_data),
{}
};
MODULE_DEVICE_TABLE(i3c, p3t1085_i3c_ids);
static int p3t1085_i3c_probe(struct i3c_device *i3cdev)
{
struct device *dev = i3cdev_to_dev(i3cdev);
struct regmap *regmap;
const struct i3c_device_id *id;
regmap = devm_regmap_init(dev, &tmp108_i3c_regmap_bus, i3cdev, &tmp108_regmap_config);
if (IS_ERR(regmap))
return dev_err_probe(dev, PTR_ERR(regmap),
"Failed to register i3c regmap\n");
id = i3c_device_match_id(i3cdev, p3t1085_i3c_ids);
return tmp108_common_probe(dev, regmap, "p3t1085_i3c", id->data);
}
static struct i3c_driver p3t1085_driver = {
.driver = {
.name = "p3t1085_i3c",
},
.probe = p3t1085_i3c_probe,
.id_table = p3t1085_i3c_ids,
};
module_i3c_i2c_driver(p3t1085_driver, &tmp108_driver)
MODULE_AUTHOR("John Muir <john@jmuir.com>");
MODULE_DESCRIPTION("Texas Instruments TMP108 temperature sensor driver");
MODULE_LICENSE("GPL");
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