[PATCH v4 04/18] usb: typec: Add device managed typec_mux_register()

[Stephen Boyd]

Simplify driver error paths by adding devm_typec_mux_register() which
will unregister the typec mux when the parent device is unbound.

Cc: Heikki Krogerus <heikki.kroge...@linux.intel.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: <linux-...@vger.kernel.org>
Cc: Pin-yen Lin <treapk...@chromium.org>
Signed-off-by: Stephen Boyd <swb...@chromium.org>
---
 drivers/usb/typec/mux.c       | 35 +++++++++++++++++++++++++++++++++++
 include/linux/usb/typec_mux.h |  7 +++++++
 2 files changed, 42 insertions(+)

diff --git a/drivers/usb/typec/mux.c b/drivers/usb/typec/mux.c
index 49926d6e72c7..db644bec862c 100644
--- a/drivers/usb/typec/mux.c
+++ b/drivers/usb/typec/mux.c
@@ -457,6 +457,41 @@ void typec_mux_unregister(struct typec_mux_dev *mux_dev)
 }
 EXPORT_SYMBOL_GPL(typec_mux_unregister);
 
+static void devm_typec_mux_unregister(void *mux_dev)
+{
+       typec_mux_unregister(mux_dev);
+}
+
+/**
+ * devm_typec_mux_register - resource managed typec_mux_register()
+ * @parent: Parent device
+ * @desc: Multiplexer description
+ *
+ * Register a typec mux and automatically unregister the typec mux
+ * when @parent is unbound from its driver.
+ *
+ * The arguments to this function are identical to typec_mux_register().
+ *
+ * Return: the typec_mux_dev structure on success or error pointer on error.
+ */
+struct typec_mux_dev *
+devm_typec_mux_register(struct device *parent, const struct typec_mux_desc 
*desc)
+{
+       int ret;
+       struct typec_mux_dev *mux_dev;
+
+       mux_dev = typec_mux_register(parent, desc);
+       if (IS_ERR(mux_dev))
+               return mux_dev;
+
+       ret = devm_add_action_or_reset(parent, devm_typec_mux_unregister, 
mux_dev);
+       if (ret)
+               return ERR_PTR(ret);
+
+       return mux_dev;
+}
+EXPORT_SYMBOL_GPL(devm_typec_mux_register);
+
 void typec_mux_set_drvdata(struct typec_mux_dev *mux_dev, void *data)
 {
        dev_set_drvdata(&mux_dev->dev, data);
diff --git a/include/linux/usb/typec_mux.h b/include/linux/usb/typec_mux.h
index efb5ed32b813..08431f0896d5 100644
--- a/include/linux/usb/typec_mux.h
+++ b/include/linux/usb/typec_mux.h
@@ -99,6 +99,8 @@ int typec_mux_set(struct typec_mux *mux, struct 
typec_mux_state *state);
 
 struct typec_mux_dev *
 typec_mux_register(struct device *parent, const struct typec_mux_desc *desc);
+struct typec_mux_dev *
+devm_typec_mux_register(struct device *parent, const struct typec_mux_desc 
*desc);
 void typec_mux_unregister(struct typec_mux_dev *mux);
 
 void typec_mux_set_drvdata(struct typec_mux_dev *mux, void *data);
@@ -123,6 +125,11 @@ typec_mux_register(struct device *parent, const struct 
typec_mux_desc *desc)
 {
        return ERR_PTR(-EOPNOTSUPP);
 }
+static inline struct typec_mux_dev *
+devm_typec_mux_register(struct device *parent, const struct typec_mux_desc 
*desc)
+{
+       return typec_mux_register(parent, desc);
+}
 static inline void typec_mux_unregister(struct typec_mux_dev *mux) {}
 
 static inline void typec_mux_set_drvdata(struct typec_mux_dev *mux, void 
*data) {}
-- 
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