[PATCH 29/49] iio:light:ltr501: Switch from CONFIG_PM_SLEEP guards to pm_ptr() / __maybe_unused

[Jonathan Cameron <jic23@xxxxxxxxxx>]

From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

Letting the compiler remove these functions when the kernel is built
without CONFIG_PM_SLEEP support is simpler and less error prone than the
use of #ifdef based config guards.

Removing instances of this approach from IIO also stops them being
copied into new drivers.

The pm_ptr() macro only removes the reference if CONFIG_PM is not
set. It is possible for CONFIG_PM=y without CONFIG_SLEEP, so this
will not always remove the pm_ops structure.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Maslov Dmitry <maslovdmitry@xxxxxxxx>
---
 drivers/iio/light/ltr501.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/iio/light/ltr501.c b/drivers/iio/light/ltr501.c
index bab5b78f2e30..f64135a4bd0c 100644
--- a/drivers/iio/light/ltr501.c
+++ b/drivers/iio/light/ltr501.c
@@ -1586,15 +1586,14 @@ static int ltr501_remove(struct i2c_client *client)
 	return 0;
 }
 
-#ifdef CONFIG_PM_SLEEP
-static int ltr501_suspend(struct device *dev)
+static __maybe_unused int ltr501_suspend(struct device *dev)
 {
 	struct ltr501_data *data = iio_priv(i2c_get_clientdata(
 					    to_i2c_client(dev)));
 	return ltr501_powerdown(data);
 }
 
-static int ltr501_resume(struct device *dev)
+static __maybe_unused int ltr501_resume(struct device *dev)
 {
 	struct ltr501_data *data = iio_priv(i2c_get_clientdata(
 					    to_i2c_client(dev)));
@@ -1602,7 +1601,6 @@ static int ltr501_resume(struct device *dev)
 	return ltr501_write_contr(data, data->als_contr,
 		data->ps_contr);
 }
-#endif
 
 static SIMPLE_DEV_PM_OPS(ltr501_pm_ops, ltr501_suspend, ltr501_resume);
 
@@ -1636,7 +1634,7 @@ static struct i2c_driver ltr501_driver = {
 	.driver = {
 		.name   = LTR501_DRV_NAME,
 		.of_match_table = ltr501_of_match,
-		.pm	= &ltr501_pm_ops,
+		.pm	= pm_ptr(&ltr501_pm_ops),
 		.acpi_match_table = ACPI_PTR(ltr_acpi_match),
 	},
 	.probe  = ltr501_probe,
-- 
2.34.0