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iio: temperature: mlx90632 Add supply regulator to sensor

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Provide possibility to toggle power supply to the sensor so that user
can optimize their setup and not have the sensor constantly powered.

Signed-off-by: Crt Mori <cmo@melexis.com>
Link: https://lore.kernel.org/r/20220808144908.1559069-1-cmo@melexis.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Crt Mori 2022-08-08 16:49:08 +02:00 committed by Jonathan Cameron
parent 33dae107b6
commit 21a60fce89
1 changed files with 56 additions and 5 deletions
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61
drivers/iio/temperature/mlx90632.c
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@ -18,6 +18,7 @@
#include <linux/math64.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@ -128,6 +129,7 @@
* calculations
* @object_ambient_temperature: Ambient temperature at object (might differ of
* the ambient temperature of sensor.
* @regulator: Regulator of the device
*/
struct mlx90632_data {
struct i2c_client *client;
@ -136,6 +138,7 @@ struct mlx90632_data {
u16 emissivity;
u8 mtyp;
u32 object_ambient_temperature;
struct regulator *regulator;
};
static const struct regmap_range mlx90632_volatile_reg_range[] = {
@ -207,6 +210,15 @@ static s32 mlx90632_pwr_continuous(struct regmap *regmap)
MLX90632_PWR_STATUS_CONTINUOUS);
}
/**
* mlx90632_reset_delay() - Give the mlx90632 some time to reset properly
* If this is not done, the following I2C command(s) will not be accepted.
*/
static void mlx90632_reset_delay(void)
{
usleep_range(150, 200);
}
/**
* mlx90632_perform_measurement() - Trigger and retrieve current measurement cycle
* @data: pointer to mlx90632_data object containing regmap information
@ -248,11 +260,7 @@ static int mlx90632_set_meas_type(struct regmap *regmap, u8 type)
if (ret < 0)
return ret;
/*
* Give the mlx90632 some time to reset properly before sending a new I2C command
* if this is not done, the following I2C command(s) will not be accepted.
*/
usleep_range(150, 200);
mlx90632_reset_delay();
ret = regmap_write_bits(regmap, MLX90632_REG_CONTROL,
(MLX90632_CFG_MTYP_MASK | MLX90632_CFG_PWR_MASK),
@ -841,6 +849,32 @@ static int mlx90632_wakeup(struct mlx90632_data *data)
return mlx90632_pwr_continuous(data->regmap);
}
static void mlx90632_disable_regulator(void *_data)
{
struct mlx90632_data *data = _data;
int ret;
ret = regulator_disable(data->regulator);
if (ret < 0)
dev_err(regmap_get_device(data->regmap),
"Failed to disable power regulator: %d\n", ret);
}
static int mlx90632_enable_regulator(struct mlx90632_data *data)
{
int ret;
ret = regulator_enable(data->regulator);
if (ret < 0) {
dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n");
return ret;
}
mlx90632_reset_delay();
return ret;
}
static int mlx90632_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@ -876,6 +910,23 @@ static int mlx90632_probe(struct i2c_client *client,
indio_dev->channels = mlx90632_channels;
indio_dev->num_channels = ARRAY_SIZE(mlx90632_channels);
mlx90632->regulator = devm_regulator_get(&client->dev, "vdd");
if (IS_ERR(mlx90632->regulator))
return dev_err_probe(&client->dev, PTR_ERR(mlx90632->regulator),
"failed to get vdd regulator");
ret = mlx90632_enable_regulator(mlx90632);
if (ret < 0)
return ret;
ret = devm_add_action_or_reset(&client->dev, mlx90632_disable_regulator,
mlx90632);
if (ret < 0) {
dev_err(&client->dev, "Failed to setup regulator cleanup action %d\n",
ret);
return ret;
}
ret = mlx90632_wakeup(mlx90632);
if (ret < 0) {
dev_err(&client->dev, "Wakeup failed: %d\n", ret);