linux-kernel - [PATCH v2 04/23] counter: Provide a wrapper to access device private data

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Message-Id: <20211227094526.698714-5-u.kleine-koenig@pengutronix.de>
Date:   Mon, 27 Dec 2021 10:45:07 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     William Breathitt Gray <vilhelm.gray@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>, kernel@...gutronix.de,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-iio@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 04/23] 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.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/counter/counter-core.c | 12 ++++++++++++
 include/linux/counter.h        |  2 ++
 2 files changed, 14 insertions(+)

diff --git a/drivers/counter/counter-core.c b/drivers/counter/counter-core.c
index f053a43c6c04..00c41f28c101 100644
--- a/drivers/counter/counter-core.c
+++ b/drivers/counter/counter-core.c
@@ -45,6 +45,18 @@ 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 b7d0a00a61cf..8daaa38c71d8 100644
--- 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,
-- 
2.33.0