linux-kernel - [PATCH v3 5/6] iio: chemical: ens160: add power management support

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Date: Tue,  4 Jun 2024 19:57:29 -0300
From: Gustavo Silva <gustavograzs@...il.com>
To: jic23@...nel.org
Cc: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	lars@...afoo.de,
	christophe.jaillet@...adoo.fr,
	devicetree@...r.kernel.org,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 5/6] iio: chemical: ens160: add power management support

ENS160 supports a deep sleep mode for minimal power consumption.
Use it to add PM sleep capability to the driver.

Signed-off-by: Gustavo Silva <gustavograzs@...il.com>
---
 drivers/iio/chemical/ens160.h      |  3 +++
 drivers/iio/chemical/ens160_core.c | 23 +++++++++++++++++++++++
 drivers/iio/chemical/ens160_i2c.c  |  1 +
 drivers/iio/chemical/ens160_spi.c  |  1 +
 4 files changed, 28 insertions(+)

diff --git a/drivers/iio/chemical/ens160.h b/drivers/iio/chemical/ens160.h
index e6cc0987a..f9f0575ce 100644
--- a/drivers/iio/chemical/ens160.h
+++ b/drivers/iio/chemical/ens160.h
@@ -4,4 +4,7 @@
 
 int devm_ens160_core_probe(struct device *dev, struct regmap *regmap, int irq,
 			   const char *name);
+
+extern const struct dev_pm_ops ens160_pm_ops;
+
 #endif
diff --git a/drivers/iio/chemical/ens160_core.c b/drivers/iio/chemical/ens160_core.c
index 3da3b1095..c1aa3b498 100644
--- a/drivers/iio/chemical/ens160_core.c
+++ b/drivers/iio/chemical/ens160_core.c
@@ -220,6 +220,29 @@ static const struct iio_info ens160_info = {
 	.read_raw = ens160_read_raw,
 };
 
+static int ens160_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ens160_data *data = iio_priv(indio_dev);
+
+	return ens160_set_mode(data, ENS160_REG_MODE_DEEP_SLEEP);
+}
+
+static int ens160_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ens160_data *data = iio_priv(indio_dev);
+	int ret;
+
+	ret = ens160_set_mode(data, ENS160_REG_MODE_IDLE);
+	if (ret)
+		return ret;
+
+	return ens160_set_mode(data, ENS160_REG_MODE_STANDARD);
+}
+EXPORT_NS_SIMPLE_DEV_PM_OPS(ens160_pm_ops, ens160_suspend, ens160_resume,
+			    IIO_ENS160);
+
 static irqreturn_t ens160_trigger_handler(int irq, void *p)
 {
 	struct iio_poll_func *pf = p;
diff --git a/drivers/iio/chemical/ens160_i2c.c b/drivers/iio/chemical/ens160_i2c.c
index f3fb45b75..57a189a4c 100644
--- a/drivers/iio/chemical/ens160_i2c.c
+++ b/drivers/iio/chemical/ens160_i2c.c
@@ -49,6 +49,7 @@ static struct i2c_driver ens160_i2c_driver = {
 	.driver = {
 		.name		= "ens160",
 		.of_match_table	= ens160_of_i2c_match,
+		.pm		= pm_sleep_ptr(&ens160_pm_ops),
 	},
 	.probe = ens160_i2c_probe,
 	.id_table = ens160_i2c_id,
diff --git a/drivers/iio/chemical/ens160_spi.c b/drivers/iio/chemical/ens160_spi.c
index 90e1e8386..10e4f5fd0 100644
--- a/drivers/iio/chemical/ens160_spi.c
+++ b/drivers/iio/chemical/ens160_spi.c
@@ -48,6 +48,7 @@ static struct spi_driver ens160_spi_driver = {
 	.driver = {
 		.name	= "ens160",
 		.of_match_table = ens160_spi_of_match,
+		.pm = pm_sleep_ptr(&ens160_pm_ops),
 	},
 	.probe		= ens160_spi_probe,
 	.id_table	= ens160_spi_id,
-- 
2.45.1