From: Vasileios Amoiridis <vassilisamir@gmail.com>
Add runtime power management to the device. To facilitate this, add also
a struct dev * inside the bme680_data structure to have the device
accesible from the data structure.
Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com>
---
drivers/iio/chemical/bme680.h | 1 +
drivers/iio/chemical/bme680_core.c | 100 +++++++++++++++++++++++++++--
2 files changed, 95 insertions(+), 6 deletions(-)
diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h
index e55a48982b3e..e9e3e08fa366 100644
--- a/drivers/iio/chemical/bme680.h
+++ b/drivers/iio/chemical/bme680.h
@@ -75,6 +75,7 @@
#define BME680_CALIB_RANGE_3_LEN 5
extern const struct regmap_config bme680_regmap_config;
+extern const struct dev_pm_ops bmp280_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 a2039b966f20..5fd5740bb7fe 100644
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -14,6 +14,7 @@
#include <linux/device.h>
#include <linux/log2.h>
#include <linux/module.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
@@ -111,6 +112,7 @@ struct bme680_data {
struct regmap *regmap;
struct bme680_calib bme680;
struct mutex lock; /* Protect multiple serial R/W ops to device. */
+ struct device *dev;
u8 oversampling_temp;
u8 oversampling_press;
u8 oversampling_humid;
@@ -753,9 +755,9 @@ static int bme680_read_gas(struct bme680_data *data, int *val)
return IIO_VAL_INT;
}
-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 ret;
@@ -803,14 +805,29 @@ 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);
+ int ret;
+
+ pm_runtime_get_sync(data->dev);
+ ret = __bme680_read_raw(indio_dev, chan, val, val2, mask);
+ pm_runtime_mark_last_busy(data->dev);
+ pm_runtime_put_autosuspend(data->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);
@@ -846,6 +863,21 @@ 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);
+ int ret;
+
+ pm_runtime_get_sync(data->dev);
+ ret = __bme680_write_raw(indio_dev, chan, val, val2, mask);
+ pm_runtime_mark_last_busy(data->dev);
+ pm_runtime_put_autosuspend(data->dev);
+
+ return ret;
+}
+
static const char bme680_oversampling_ratio_show[] = "1 2 4 8 16";
static IIO_CONST_ATTR(oversampling_ratio_available,
@@ -873,6 +905,15 @@ static void bme680_regulators_disable(void *data)
regulator_bulk_disable(BME680_NUM_SUPPLIES, supplies);
}
+static void bme680_pm_disable(void *data)
+{
+ struct device *dev = data;
+
+ pm_runtime_get_sync(dev);
+ pm_runtime_put_noidle(dev);
+ pm_runtime_disable(dev);
+}
+
int bme680_core_probe(struct device *dev, struct regmap *regmap,
const char *name)
{
@@ -887,6 +928,7 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
data = iio_priv(indio_dev);
mutex_init(&data->lock);
dev_set_drvdata(dev, indio_dev);
+ data->dev = dev;
data->regmap = regmap;
indio_dev->name = name;
indio_dev->channels = bme680_channels;
@@ -947,10 +989,56 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
return dev_err_probe(dev, ret,
"failed to set gas config data\n");
+ /* Enable runtime PM */
+ pm_runtime_get_noresume(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ pm_runtime_set_autosuspend_delay(dev, BME680_STARTUP_TIME_US * 100);
+ pm_runtime_use_autosuspend(dev);
+ pm_runtime_put(dev);
+
+ ret = devm_add_action_or_reset(dev, bme680_pm_disable, 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 regulator_bulk_disable(BME680_NUM_SUPPLIES, data->supplies);
+}
+
+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 = regulator_bulk_enable(BME680_NUM_SUPPLIES, data->supplies);
+ if (ret)
+ return ret;
+
+ fsleep(BME680_STARTUP_TIME_US);
+
+ ret = bme680_chip_config(data);
+ if (ret)
+ return ret;
+
+ ret = bme680_gas_config(data);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+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");
--
2.43.0On Thu, Oct 10, 2024 at 11:00:25PM +0200, vamoirid wrote:
> From: Vasileios Amoiridis <vassilisamir@gmail.com>
>
> Add runtime power management to the device. To facilitate this, add also
> a struct dev * inside the bme680_data structure to have the device
> accesible from the data structure.
...
> --- a/drivers/iio/chemical/bme680.h
> +++ b/drivers/iio/chemical/bme680.h
> @@ -75,6 +75,7 @@
> #define BME680_CALIB_RANGE_3_LEN 5
>
> extern const struct regmap_config bme680_regmap_config;
> +extern const struct dev_pm_ops bmp280_dev_pm_ops;
Is pm.h being included already in this header? Otherwise you need to add it.
...
> struct regmap *regmap;
> struct bme680_calib bme680;
> struct mutex lock; /* Protect multiple serial R/W ops to device. */
> + struct device *dev;
Is it the same that you may get wia regmap_get_device()?
> u8 oversampling_temp;
> u8 oversampling_press;
> u8 oversampling_humid;
...
> + /* Enable runtime PM */
> + pm_runtime_get_noresume(dev);
> + pm_runtime_set_active(dev);
> + pm_runtime_enable(dev);
> + pm_runtime_set_autosuspend_delay(dev, BME680_STARTUP_TIME_US * 100);
> + pm_runtime_use_autosuspend(dev);
> + pm_runtime_put(dev);
Can we use devm_pm_runtime_enable() for some of the above?
> + ret = devm_add_action_or_reset(dev, bme680_pm_disable, dev);
> + if (ret)
> + return ret;
...
> +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 = regulator_bulk_enable(BME680_NUM_SUPPLIES, data->supplies);
> + if (ret)
> + return ret;
> +
> + fsleep(BME680_STARTUP_TIME_US);
> +
> + ret = bme680_chip_config(data);
> + if (ret)
> + return ret;
> + ret = bme680_gas_config(data);
> + if (ret)
> + return ret;
> +
> + return 0;
return bme680_gas_config(...);
> +}
...
> +EXPORT_RUNTIME_DEV_PM_OPS(bme680_dev_pm_ops, bme680_runtime_suspend,
> + bme680_runtime_resume, NULL);
You also need pm.h for the macro IIRC.
--
With Best Regards,
Andy Shevchenko
On Fri, Oct 11, 2024 at 01:10:20PM +0300, Andy Shevchenko wrote:
> On Thu, Oct 10, 2024 at 11:00:25PM +0200, vamoirid wrote:
> > From: Vasileios Amoiridis <vassilisamir@gmail.com>
> >
> > Add runtime power management to the device. To facilitate this, add also
> > a struct dev * inside the bme680_data structure to have the device
> > accesible from the data structure.
>
> ...
>
> > --- a/drivers/iio/chemical/bme680.h
> > +++ b/drivers/iio/chemical/bme680.h
> > @@ -75,6 +75,7 @@
> > #define BME680_CALIB_RANGE_3_LEN 5
> >
> > extern const struct regmap_config bme680_regmap_config;
> > +extern const struct dev_pm_ops bmp280_dev_pm_ops;
>
> Is pm.h being included already in this header? Otherwise you need to add it.
>
No it is not, and indeed I need to add it. Probably because it was
included by some other file I didn't get an error from gcc?
> ...
>
> > struct regmap *regmap;
> > struct bme680_calib bme680;
> > struct mutex lock; /* Protect multiple serial R/W ops to device. */
> > + struct device *dev;
>
> Is it the same that you may get wia regmap_get_device()?
>
Yes it is the same. Maybe I can try and see if I can use the following
regmap_get_device(data->regmap)
in the places where the pm functions are used in order to not declare a
new value inside the struct bme680_data. But in general, is this approach
prefered?
> > u8 oversampling_temp;
> > u8 oversampling_press;
> > u8 oversampling_humid;
>
> ...
>
> > + /* Enable runtime PM */
> > + pm_runtime_get_noresume(dev);
> > + pm_runtime_set_active(dev);
> > + pm_runtime_enable(dev);
> > + pm_runtime_set_autosuspend_delay(dev, BME680_STARTUP_TIME_US * 100);
> > + pm_runtime_use_autosuspend(dev);
> > + pm_runtime_put(dev);
>
> Can we use devm_pm_runtime_enable() for some of the above?
>
I will have to check its use, and I will let you know.
> > + ret = devm_add_action_or_reset(dev, bme680_pm_disable, dev);
> > + if (ret)
> > + return ret;
>
> ...
>
> > +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 = regulator_bulk_enable(BME680_NUM_SUPPLIES, data->supplies);
> > + if (ret)
> > + return ret;
> > +
> > + fsleep(BME680_STARTUP_TIME_US);
> > +
> > + ret = bme680_chip_config(data);
> > + if (ret)
> > + return ret;
>
> > + ret = bme680_gas_config(data);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
>
> return bme680_gas_config(...);
>
Indeed, much cleaner, thanks!
> > +}
>
> ...
>
> > +EXPORT_RUNTIME_DEV_PM_OPS(bme680_dev_pm_ops, bme680_runtime_suspend,
> > + bme680_runtime_resume, NULL);
>
> You also need pm.h for the macro IIRC.
>
ACK.
> --
> With Best Regards,
> Andy Shevchenko
>
>
Cheers,
Vasilis
Fri, Oct 11, 2024 at 09:02:32PM +0200, Vasileios Aoiridis kirjoitti: > On Fri, Oct 11, 2024 at 01:10:20PM +0300, Andy Shevchenko wrote: > > On Thu, Oct 10, 2024 at 11:00:25PM +0200, vamoirid wrote: ... > > > +extern const struct dev_pm_ops bmp280_dev_pm_ops; > > > > Is pm.h being included already in this header? Otherwise you need to add it. > > No it is not, and indeed I need to add it. Probably because it was > included by some other file I didn't get an error from gcc? Yeah, it's called a "proxy" header in general meaning. We should try hard not to use such headers (meaning not to use them in a "proxy" mode). ... > > > struct regmap *regmap; > > > struct bme680_calib bme680; > > > struct mutex lock; /* Protect multiple serial R/W ops to device. */ > > > + struct device *dev; > > > > Is it the same that you may get wia regmap_get_device()? > > > > Yes it is the same. Maybe I can try and see if I can use the following > > regmap_get_device(data->regmap) > > in the places where the pm functions are used in order to not declare a > new value inside the struct bme680_data. But in general, is this approach > prefered? Since there is a getter already available, I prefer not to shortcut it via adding a duplicating information to the data structure. > > > u8 oversampling_temp; > > > u8 oversampling_press; > > > u8 oversampling_humid; -- With Best Regards, Andy Shevchenko
On Fri, 11 Oct 2024 21:02:32 +0200 Vasileios Aoiridis <vassilisamir@gmail.com> wrote: > On Fri, Oct 11, 2024 at 01:10:20PM +0300, Andy Shevchenko wrote: > > On Thu, Oct 10, 2024 at 11:00:25PM +0200, vamoirid wrote: > > > From: Vasileios Amoiridis <vassilisamir@gmail.com> > > > > > > Add runtime power management to the device. To facilitate this, add also > > > a struct dev * inside the bme680_data structure to have the device > > > accesible from the data structure. > > > > ... > > > > > --- a/drivers/iio/chemical/bme680.h > > > +++ b/drivers/iio/chemical/bme680.h > > > @@ -75,6 +75,7 @@ > > > #define BME680_CALIB_RANGE_3_LEN 5 > > > > > > extern const struct regmap_config bme680_regmap_config; > > > +extern const struct dev_pm_ops bmp280_dev_pm_ops; > > > > Is pm.h being included already in this header? Otherwise you need to add it. > > > > No it is not, and indeed I need to add it. Probably because it was > included by some other file I didn't get an error from gcc? > > > ... > > > > > struct regmap *regmap; > > > struct bme680_calib bme680; > > > struct mutex lock; /* Protect multiple serial R/W ops to device. */ > > > + struct device *dev; > > > > Is it the same that you may get wia regmap_get_device()? > > > > Yes it is the same. Maybe I can try and see if I can use the following > > regmap_get_device(data->regmap) > > in the places where the pm functions are used in order to not declare a > new value inside the struct bme680_data. But in general, is this approach > prefered? slightly by me. I tend not to poke on that if people have chosen a local variable, but it is a little neater. This patch might get caught up in an effort to simplify the autosuspend handling but if it is we'll deal with that whilst merging. There 'should' be a clean path to transition from this style to the proposed new one where a simple pm_runtime_put() without the mark_last_busy stuff is enough for autosuspend cases. Jonathan
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