counter: Provide a wrapper to access device private data

For now this just wraps accessing struct counter_device::priv. However
this is about to change and converting drivers to this helper
individually makes fixing device lifetime issues result in easier to
review patches.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20211230150300.72196-5-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
index f053a43..00c41f2 100644 (file)
--- a/drivers/counter/counter-core.c
+++ b/drivers/counter/counter-core.c
@@ -46,6 +46,18 @@ static struct bus_type counter_bus_type = {
 static dev_t counter_devt;
 
 /**
+ * counter_priv - access counter device private data
+ * @counter: counter device
+ *
+ * Get the counter device private data
+ */
+void *counter_priv(const struct counter_device *const counter)
+{
+       return counter->priv;
+}
+EXPORT_SYMBOL_GPL(counter_priv);
+
+/**
  * counter_register - register Counter to the system
  * @counter:   pointer to Counter to register
  *

diff --git a/include/linux/counter.h b/include/linux/counter.h
index dfbde28..627f175 100644 (file)
--- a/include/linux/counter.h
+++ b/include/linux/counter.h
@@ -329,6 +329,8 @@ struct counter_device {
        struct mutex ops_exist_lock;
 };
 
+void *counter_priv(const struct counter_device *const counter);
+
 int counter_register(struct counter_device *const counter);
 void counter_unregister(struct counter_device *const counter);
 int devm_counter_register(struct device *dev,