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From: Jonathan Cameron <jic23@kernel.org>
To: linux-iio@vger.kernel.org
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
	Hans de Goede <hdegoede@redhat.com>,
	Alexandru Ardelean <aardelean@deviqon.com>,
	Shawn Guo <shawnguo@kernel.org>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH v2 2/5] iio: accel: mma9551/mma9553: Simplify pm logic
Date: Thu,  3 Jun 2021 19:52:04 +0100	[thread overview]
Message-ID: <20210603185207.3646368-3-jic23@kernel.org> (raw)
In-Reply-To: <20210603185207.3646368-1-jic23@kernel.org>

From: Jonathan Cameron <Jonathan.Cameron@huawei.com>

I can't see why we shouldn't sleep in the system resume path to allow
the device firmware to fully wakeup.  Having done that, the runtime
system functions are identical (down to an error print) so use
pm_runtime_force_suspend() and pm_runtime_force_resume() to reduce
repitition.

General preference in IIO is now to mark these functions __maybe_unused
instead of using ifdefs as it is easy to get them wrong.
Here they appear correct, but provide a less than desirable example
to copy into other drivers.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <aardelean@deviqon.com>
---
 drivers/iio/accel/mma9551.c | 37 ++++--------------------------------
 drivers/iio/accel/mma9553.c | 38 ++++---------------------------------
 2 files changed, 8 insertions(+), 67 deletions(-)

diff --git a/drivers/iio/accel/mma9551.c b/drivers/iio/accel/mma9551.c
index 2b74f67536a3..1b4a8b27f14a 100644
--- a/drivers/iio/accel/mma9551.c
+++ b/drivers/iio/accel/mma9551.c
@@ -510,8 +510,7 @@ static int mma9551_remove(struct i2c_client *client)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int mma9551_runtime_suspend(struct device *dev)
+static __maybe_unused int mma9551_runtime_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 	struct mma9551_data *data = iio_priv(indio_dev);
@@ -522,13 +521,13 @@ static int mma9551_runtime_suspend(struct device *dev)
 	mutex_unlock(&data->mutex);
 	if (ret < 0) {
 		dev_err(&data->client->dev, "powering off device failed\n");
-		return -EAGAIN;
+		return ret;
 	}
 
 	return 0;
 }
 
-static int mma9551_runtime_resume(struct device *dev)
+static __maybe_unused int mma9551_runtime_resume(struct device *dev)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 	struct mma9551_data *data = iio_priv(indio_dev);
@@ -542,38 +541,10 @@ static int mma9551_runtime_resume(struct device *dev)
 
 	return 0;
 }
-#endif
-
-#ifdef CONFIG_PM_SLEEP
-static int mma9551_suspend(struct device *dev)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
-	struct mma9551_data *data = iio_priv(indio_dev);
-	int ret;
-
-	mutex_lock(&data->mutex);
-	ret = mma9551_set_device_state(data->client, false);
-	mutex_unlock(&data->mutex);
-
-	return ret;
-}
-
-static int mma9551_resume(struct device *dev)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
-	struct mma9551_data *data = iio_priv(indio_dev);
-	int ret;
 
-	mutex_lock(&data->mutex);
-	ret = mma9551_set_device_state(data->client, true);
-	mutex_unlock(&data->mutex);
-
-	return ret;
-}
-#endif
 
 static const struct dev_pm_ops mma9551_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
 	SET_RUNTIME_PM_OPS(mma9551_runtime_suspend,
 			   mma9551_runtime_resume, NULL)
 };
diff --git a/drivers/iio/accel/mma9553.c b/drivers/iio/accel/mma9553.c
index 32c9a79ebfec..dc2a3316c1a3 100644
--- a/drivers/iio/accel/mma9553.c
+++ b/drivers/iio/accel/mma9553.c
@@ -1149,8 +1149,7 @@ static int mma9553_remove(struct i2c_client *client)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int mma9553_runtime_suspend(struct device *dev)
+static __maybe_unused int mma9553_runtime_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 	struct mma9553_data *data = iio_priv(indio_dev);
@@ -1161,13 +1160,13 @@ static int mma9553_runtime_suspend(struct device *dev)
 	mutex_unlock(&data->mutex);
 	if (ret < 0) {
 		dev_err(&data->client->dev, "powering off device failed\n");
-		return -EAGAIN;
+		return ret;
 	}
 
 	return 0;
 }
 
-static int mma9553_runtime_resume(struct device *dev)
+static __maybe_unused int mma9553_runtime_resume(struct device *dev)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 	struct mma9553_data *data = iio_priv(indio_dev);
@@ -1181,38 +1180,9 @@ static int mma9553_runtime_resume(struct device *dev)
 
 	return 0;
 }
-#endif
-
-#ifdef CONFIG_PM_SLEEP
-static int mma9553_suspend(struct device *dev)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
-	struct mma9553_data *data = iio_priv(indio_dev);
-	int ret;
-
-	mutex_lock(&data->mutex);
-	ret = mma9551_set_device_state(data->client, false);
-	mutex_unlock(&data->mutex);
-
-	return ret;
-}
-
-static int mma9553_resume(struct device *dev)
-{
-	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
-	struct mma9553_data *data = iio_priv(indio_dev);
-	int ret;
-
-	mutex_lock(&data->mutex);
-	ret = mma9551_set_device_state(data->client, true);
-	mutex_unlock(&data->mutex);
-
-	return ret;
-}
-#endif
 
 static const struct dev_pm_ops mma9553_pm_ops = {
-	SET_SYSTEM_SLEEP_PM_OPS(mma9553_suspend, mma9553_resume)
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, pm_runtime_force_resume)
 	SET_RUNTIME_PM_OPS(mma9553_runtime_suspend,
 			   mma9553_runtime_resume, NULL)
 };
-- 
2.31.1


  parent reply	other threads:[~2021-06-03 18:50 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-03 18:52 [PATCH v2 0/5] iio: accel: mma9551/mma9553 Cleanup and update Jonathan Cameron
2021-06-03 18:52 ` [PATCH v2 1/5] iio: accel: mma9551/mma9553: Drop explicit ACPI match support Jonathan Cameron
2021-06-03 18:52 ` Jonathan Cameron [this message]
2021-06-03 18:52 ` [PATCH v2 3/5] iio: accel: mma9551: Add support to get irqs directly from fwnode Jonathan Cameron
2021-06-03 18:52 ` [PATCH v2 4/5] iio: accel: mma9551: Use devm managed functions to tidy up probe() Jonathan Cameron
2021-06-03 18:52 ` [PATCH v2 5/5] iio: accel: mma9553: " Jonathan Cameron
2021-07-18 15:14 ` [PATCH v2 0/5] iio: accel: mma9551/mma9553 Cleanup and update Jonathan Cameron

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