Commit 21a60fce authored by Crt Mori's avatar Crt Mori Committed by Jonathan Cameron
Browse files

iio: temperature: mlx90632 Add supply regulator to sensor 



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: default avatarCrt Mori <cmo@melexis.com>
Link: https://lore.kernel.org/r/20220808144908.1559069-1-cmo@melexis.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 33dae107

drivers/iio/temperature/mlx90632.c

+56 −5
Original line number Diff line number Diff line
@@ -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);