linux-kernel - [PATCH 1/2] iio: temperature: mlx90632 Add supply regulator to sensor

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Date:   Tue,  2 Aug 2022 12:30:22 +0200
From:   Crt Mori <cmo@...exis.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lars-Peter Clausen <lars@...afoo.de>,
        Crt Mori <cmo@...exis.com>
Subject: [PATCH 1/2] 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: Crt Mori <cmo@...exis.com>
---
 drivers/iio/temperature/mlx90632.c | 52 ++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/drivers/iio/temperature/mlx90632.c b/drivers/iio/temperature/mlx90632.c
index 7ee7ff8047a4..e6e5e649a9f9 100644
--- a/drivers/iio/temperature/mlx90632.c
+++ b/drivers/iio/temperature/mlx90632.c
@@ -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[] = {
@@ -841,6 +844,37 @@ 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_set_voltage(data->regulator, 3200000, 3600000);
+	if (ret < 0) {
+		dev_err(regmap_get_device(data->regmap), "Failed to set voltage on regulator!\n");
+		return ret;
+	}
+
+	ret = regulator_enable(data->regulator);
+	if (ret < 0) {
+		dev_err(regmap_get_device(data->regmap), "Failed to enable power regulator!\n");
+	} else {
+		/* Give the device a little bit of time to start up. */
+		msleep(MLX90632_SLEEP_DELAY_MS);
+	}
+	return ret;
+}
+
 static int mlx90632_probe(struct i2c_client *client,
 			  const struct i2c_device_id *id)
 {
@@ -876,6 +910,24 @@ 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)) {
+		ret = mlx90632_enable_regulator(mlx90632);
+		if (ret < 0) {
+			dev_err(&client->dev, "Failed to enable regulator!\n");
+			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);
-- 
2.34.1