netdev - [PATCH lora-next 2/5] net: lora: sx130x: Prepare storing driver-specific data

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Date:   Fri,  4 Jan 2019 12:21:28 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     linux-lpwan@...ts.infradead.org, linux-serial@...r.kernel.org
Cc:     linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: [PATCH lora-next 2/5] net: lora: sx130x: Prepare storing driver-specific data

Some drivers (e.g., serdev) may need to access private data not part of
the core sx130x_priv, which is inaccessible to other source files.
As the sx130x core expects to obtain the net_device from the dev's drvdata,
we can't reuse that in derived drivers and need a new field plus helpers.

Signed-off-by: Andreas Färber <afaerber@...e.de>
---
 drivers/net/lora/sx130x.c   | 19 +++++++++++++++++++
 include/linux/lora/sx130x.h |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/drivers/net/lora/sx130x.c b/drivers/net/lora/sx130x.c
index 840052955874..978c921ca5ec 100644
--- a/drivers/net/lora/sx130x.c
+++ b/drivers/net/lora/sx130x.c
@@ -58,6 +58,7 @@ struct sx130x_priv {
 	struct regmap		*regmap;
 	struct regmap_field	*regmap_fields[ARRAY_SIZE(sx130x_regmap_fields)];
 	struct mutex		io_lock;
+	void			*drvdata;
 };
 
 struct regmap *sx130x_get_regmap(struct device *dev)
@@ -68,6 +69,24 @@ struct regmap *sx130x_get_regmap(struct device *dev)
 	return priv->regmap;
 }
 
+void sx130x_set_drvdata(struct device *dev, void *drvdata)
+{
+	struct net_device *netdev = dev_get_drvdata(dev);
+	struct sx130x_priv *priv = netdev_priv(netdev);
+
+	priv->drvdata = drvdata;
+}
+EXPORT_SYMBOL_GPL(sx130x_set_drvdata);
+
+void *sx130x_get_drvdata(struct device *dev)
+{
+	struct net_device *netdev = dev_get_drvdata(dev);
+	struct sx130x_priv *priv = netdev_priv(netdev);
+
+	return priv->drvdata;
+}
+EXPORT_SYMBOL_GPL(sx130x_get_drvdata);
+
 void sx130x_io_lock(struct device *dev)
 {
 	struct net_device *netdev = dev_get_drvdata(dev);
diff --git a/include/linux/lora/sx130x.h b/include/linux/lora/sx130x.h
index d6f027ef283f..85b088ec77b8 100644
--- a/include/linux/lora/sx130x.h
+++ b/include/linux/lora/sx130x.h
@@ -14,6 +14,8 @@
 #include <linux/regmap.h>
 
 extern const struct regmap_config sx130x_regmap_config;
+void sx130x_set_drvdata(struct device *dev, void *drvdata);
+void *sx130x_get_drvdata(struct device *dev);
 int sx130x_early_probe(struct regmap *regmap, struct gpio_desc *rst);
 int sx130x_probe(struct device *dev);
 int sx130x_remove(struct device *dev);
-- 
2.16.4