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hwmon: (tmp108) Add support for P3T1035 and P3T2030

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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>
This commit is contained in:
Mayank Mahajan 2026-01-19 09:34:58 +05:30 committed by Guenter Roeck
parent 9f3f040f7b
commit 72037c4128
2 changed files with 161 additions and 38 deletions
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2
drivers/hwmon/Kconfig
View File

@ -2398,7 +2398,7 @@ config SENSORS_TMP108
select REGMAP_I3C if I3C
help
If you say yes here you get support for Texas Instruments TMP108
sensor chips and NXP P3T1085.
sensor chips, NXP temperature sensors P3T1035, P3T1085 and P3T2030.
This driver can also be built as a module. If so, the module
will be called tmp108.

197
drivers/hwmon/tmp108.c
View File

@ -4,6 +4,7 @@
* Copyright (C) 2016 John Muir <john@jmuir.com>
*/
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
@ -17,6 +18,7 @@
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/util_macros.h>
#define DRIVER_NAME "tmp108"
@ -70,10 +72,36 @@
#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 */
@ -101,21 +129,8 @@ static int tmp108_read(struct device *dev, enum hwmon_sensor_types type,
&regval);
if (err < 0)
return err;
switch (regval & TMP108_CONF_CONVRATE_MASK) {
case TMP108_CONVRATE_0P25HZ:
default:
*temp = 4000;
break;
case TMP108_CONVRATE_1HZ:
*temp = 1000;
break;
case TMP108_CONVRATE_4HZ:
*temp = 250;
break;
case TMP108_CONVRATE_16HZ:
*temp = 63;
break;
}
*temp = tmp108->params->sample_times[FIELD_GET(TMP108_CONF_CONVRATE_FLD,
regval)];
return 0;
}
return -EOPNOTSUPP;
@ -192,22 +207,18 @@ static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
{
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) {
if (temp < 156)
mask = TMP108_CONVRATE_16HZ;
else if (temp < 625)
mask = TMP108_CONVRATE_4HZ;
else if (temp < 2500)
mask = TMP108_CONVRATE_1HZ;
else
mask = TMP108_CONVRATE_0P25HZ;
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,
mask);
FIELD_PREP(TMP108_CONF_CONVRATE_FLD, index));
}
return -EOPNOTSUPP;
}
@ -251,6 +262,8 @@ static int tmp108_write(struct device *dev, enum hwmon_sensor_types type,
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;
@ -264,8 +277,11 @@ static umode_t tmp108_is_visible(const void *data, enum hwmon_sensor_types type,
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;
@ -311,6 +327,106 @@ static bool tmp108_is_volatile_reg(struct device *dev, unsigned int reg)
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,
@ -323,7 +439,8 @@ static const struct regmap_config tmp108_regmap_config = {
.use_single_write = true,
};
static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *name)
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;
@ -340,6 +457,7 @@ static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *
dev_set_drvdata(dev, tmp108);
tmp108->regmap = regmap;
tmp108->params = params;
err = regmap_read(tmp108->regmap, TMP108_REG_CONF, &config);
if (err < 0) {
@ -351,7 +469,6 @@ static int tmp108_common_probe(struct device *dev, struct regmap *regmap, char *
/* Only continuous mode is supported. */
config &= ~TMP108_CONF_MODE_MASK;
config |= TMP108_MODE_CONTINUOUS;
/* Only comparator mode is supported. */
config &= ~TMP108_CONF_TM;
@ -386,15 +503,15 @@ static int tmp108_probe(struct i2c_client *client)
struct regmap *regmap;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_WORD_DATA))
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_i2c(client, &tmp108_regmap_config);
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);
return tmp108_common_probe(dev, regmap, client->name, i2c_get_match_data(client));
}
static int tmp108_suspend(struct device *dev)
@ -420,15 +537,17 @@ static int tmp108_resume(struct device *dev)
static DEFINE_SIMPLE_DEV_PM_OPS(tmp108_dev_pm_ops, tmp108_suspend, tmp108_resume);
static const struct i2c_device_id tmp108_i2c_ids[] = {
{ "p3t1085" },
{ "tmp108" },
{ }
{ "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,p3t1085", },
{ .compatible = "ti,tmp108", },
{ .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);
@ -444,7 +563,8 @@ static struct i2c_driver tmp108_driver = {
};
static const struct i3c_device_id p3t1085_i3c_ids[] = {
I3C_DEVICE(0x011b, 0x1529, NULL),
I3C_DEVICE(0x011B, 0x1529, &tmp108_data),
I3C_DEVICE(0x011B, 0x152B, &p3t1035_data),
{}
};
MODULE_DEVICE_TABLE(i3c, p3t1085_i3c_ids);
@ -453,13 +573,16 @@ 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_i3c(i3cdev, &tmp108_regmap_config);
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");
return tmp108_common_probe(dev, regmap, "p3t1085_i3c");
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 = {