[PATCH v3 7/7] iio: chemical: bme680: add power management

Vasileios Amoiridis
2024-11-02T13:13:33Z

Add runtime power management to the device.

Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
---
drivers/iio/chemical/bme680.h | 2 +
drivers/iio/chemical/bme680_core.c | 104 +++++++++++++++++++++++++++--
drivers/iio/chemical/bme680_i2c.c | 1 +
drivers/iio/chemical/bme680_spi.c | 1 +
4 files changed, 101 insertions(+), 7 deletions(-)

diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h
index 00ab89b3138b..7d86ed8b02e6 100644
--- a/drivers/iio/chemical/bme680.h
+++ b/drivers/iio/chemical/bme680.h
@@ -2,6 +2,7 @@
#ifndef BME680_H_
#define BME680_H_

+#include <linux/pm.h>
#include <linux/regmap.h>

#define BME680_REG_CHIP_ID 0xD0
@@ -80,6 +81,7 @@
#define BME680_CALIB_RANGE_3_LEN 5

extern const struct regmap_config bme680_regmap_config;
+extern const struct dev_pm_ops bme680_dev_pm_ops;

int bme680_core_probe(struct device *dev, struct regmap *regmap,
const char *name);
diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
index 31769e0df7c2..61d095f1d2f6 100644
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -14,6 +14,8 @@
#include <linux/device.h>
#include <linux/log2.h>
#include <linux/module.h>
+#include <linux/pm.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>

@@ -822,9 +824,9 @@ static int bme680_read_gas(struct bme680_data *data, int *comp_gas_res)
return 0;
}

-static int bme680_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val, int *val2, long mask)
+static int __bme680_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
{
struct bme680_data *data = iio_priv(indio_dev);
int chan_val, ret;
@@ -937,14 +939,30 @@ static int bme680_read_raw(struct iio_dev *indio_dev,
}
}

+static int bme680_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct bme680_data *data = iio_priv(indio_dev);
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+
+ pm_runtime_get_sync(dev);
+ ret = __bme680_read_raw(indio_dev, chan, val, val2, mask);
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
+ return ret;
+}
+
static bool bme680_is_valid_oversampling(int rate)
{
return (rate > 0 && rate <= 16 && is_power_of_2(rate));
}

-static int bme680_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val, int val2, long mask)
+static int __bme680_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
{
struct bme680_data *data = iio_priv(indio_dev);

@@ -989,6 +1007,22 @@ static int bme680_write_raw(struct iio_dev *indio_dev,
}
}

+static int bme680_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct bme680_data *data = iio_priv(indio_dev);
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+
+ pm_runtime_get_sync(dev);
+ ret = __bme680_write_raw(indio_dev, chan, val, val2, mask);
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
+ return ret;
+}
+
static const char bme680_oversampling_ratio_show[] = "1 2 4 8 16";

static IIO_CONST_ATTR(oversampling_ratio_available,
@@ -1091,6 +1125,30 @@ static irqreturn_t bme680_trigger_handler(int irq, void *p)
return IRQ_HANDLED;
}

+static int bme680_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct bme680_data *data = iio_priv(indio_dev);
+ struct device *dev = regmap_get_device(data->regmap);
+
+ pm_runtime_get_sync(dev);
+ return 0;
+}
+
+static int bme680_buffer_postdisable(struct iio_dev *indio_dev)
+{
+ struct bme680_data *data = iio_priv(indio_dev);
+ struct device *dev = regmap_get_device(data->regmap);
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+ return 0;
+}
+
+static const struct iio_buffer_setup_ops bme680_buffer_setup_ops = {
+ .preenable = bme680_buffer_preenable,
+ .postdisable = bme680_buffer_postdisable,
+};
+
int bme680_core_probe(struct device *dev, struct regmap *regmap,
const char *name)
{
@@ -1164,15 +1222,47 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
iio_pollfunc_store_time,
bme680_trigger_handler,
- NULL);
+ &bme680_buffer_setup_ops);
if (ret)
return dev_err_probe(dev, ret,
"iio triggered buffer setup failed\n");

+ /* Enable runtime PM */
+ pm_runtime_set_autosuspend_delay(dev, BME680_STARTUP_TIME_US);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_set_active(dev);
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
+
return devm_iio_device_register(dev, indio_dev);
}
EXPORT_SYMBOL_NS_GPL(bme680_core_probe, IIO_BME680);

+static int bme680_runtime_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct bme680_data *data = iio_priv(indio_dev);
+
+ return bme680_set_mode(data, BME680_MODE_SLEEP);
+}
+
+static int bme680_runtime_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct bme680_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = bme680_chip_config(data);
+ if (ret)
+ return ret;
+
+ return bme680_gas_config(data);
+}
+
+EXPORT_RUNTIME_DEV_PM_OPS(bme680_dev_pm_ops, bme680_runtime_suspend,
+ bme680_runtime_resume, NULL);
+
MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>");
MODULE_DESCRIPTION("Bosch BME680 Driver");
MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/bme680_i2c.c b/drivers/iio/chemical/bme680_i2c.c
index 7c4224d75955..9998d7fa3e98 100644
--- a/drivers/iio/chemical/bme680_i2c.c
+++ b/drivers/iio/chemical/bme680_i2c.c
@@ -51,6 +51,7 @@ static struct i2c_driver bme680_i2c_driver = {
.driver = {
.name = "bme680_i2c",
.of_match_table = bme680_of_i2c_match,
+ .pm = pm_ptr(&bme680_dev_pm_ops),
},
.probe = bme680_i2c_probe,
.id_table = bme680_i2c_id,
diff --git a/drivers/iio/chemical/bme680_spi.c b/drivers/iio/chemical/bme680_spi.c
index 7c54bd17d4b0..43d59544d903 100644
--- a/drivers/iio/chemical/bme680_spi.c
+++ b/drivers/iio/chemical/bme680_spi.c
@@ -154,6 +154,7 @@ static struct spi_driver bme680_spi_driver = {
.driver = {
.name = "bme680_spi",
.of_match_table = bme680_of_spi_match,
+ .pm = pm_ptr(&bme680_dev_pm_ops),
},
.probe = bme680_spi_probe,
.id_table = bme680_spi_id,
--
2.43.0