iio:trigger: Introduce iio_tigger_{set,get}_drvdata

Introduce iio_tigger_{set,get}_drvdata which allows to attach driver specific
data to a trigger. The functions wrap access to the triggers private_data field
and all current users are updated to use iio_tigger_{set,get}_drvdata instead of
directly accessing the private_data field. This is the first step towards
removing the private_data field from the iio_trigger struct.

The following coccinelle script has been used to update the drivers:
<smpl>
@@
struct iio_trigger *trigger;
expression priv;
@@
-trigger->private_data = priv
+iio_trigger_set_drv_data(trigger, priv)

@@
struct iio_trigger *trigger;
@@
-trigger->private_data
+iio_trigger_get_drv_data(trigger)
</smpl>

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/staging/iio/adc/mxs-lradc.c b/drivers/staging/iio/adc/mxs-lradc.c
index 25a4359a92db..eab975d11bb2 100644
--- a/drivers/staging/iio/adc/mxs-lradc.c
+++ b/drivers/staging/iio/adc/mxs-lradc.c
@@ -646,7 +646,7 @@ static irqreturn_t mxs_lradc_trigger_handler(int irq, void *p)
 
 static int mxs_lradc_configure_trigger(struct iio_trigger *trig, bool state)
 {
-	struct iio_dev *iio = trig->private_data;
+	struct iio_dev *iio = iio_trigger_get_drvdata(trig);
 	struct mxs_lradc *lradc = iio_priv(iio);
 	const uint32_t st = state ? STMP_OFFSET_REG_SET : STMP_OFFSET_REG_CLR;
 
@@ -670,7 +670,7 @@ static int mxs_lradc_trigger_init(struct iio_dev *iio)
 		return -ENOMEM;
 
 	trig->dev.parent = iio->dev.parent;
-	trig->private_data = iio;
+	iio_trigger_set_drvdata(trig, iio);
 	trig->ops = &mxs_lradc_trigger_ops;
 
 	ret = iio_trigger_register(trig);