linux-kernel - [PATCH 2/7] usb: typec: mux: Add CONFIG guards for functions

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Date:   Tue,  7 Jun 2022 19:00:20 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     bleung@...omium.org, swboyd@...omium.org,
        heikki.krogerus@...ux.intel.com,
        Prashant Malani <pmalani@...omium.org>,
        Andrzej Hajda <andrzej.hajda@...el.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVERS),
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        José Expósito <jose.exposito89@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Maxime Ripard <maxime@...no.tech>,
        Neil Armstrong <narmstrong@...libre.com>,
        Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>, Pin-Yen Lin <treapking@...omium.org>,
        Robert Foss <robert.foss@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Tzung-Bi Shih <tzungbi@...gle.com>,
        Xin Ji <xji@...logixsemi.com>
Subject: [PATCH 2/7] usb: typec: mux: Add CONFIG guards for functions

There are some drivers that can use the Type C mux API, but don't have
to. Introduce CONFIG guards for the mux functions so that drivers can
include the header file and not run into compilation errors on systems
which don't have CONFIG_TYPEC enabled. When CONFIG_TYPEC is not enabled,
the Type C mux functions will be stub versions of the original calls.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 include/linux/usb/typec_mux.h | 38 +++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/include/linux/usb/typec_mux.h b/include/linux/usb/typec_mux.h
index ee57781dcf28..758d34ced1f8 100644
--- a/include/linux/usb/typec_mux.h
+++ b/include/linux/usb/typec_mux.h
@@ -58,6 +58,8 @@ struct typec_mux_desc {
 	void *drvdata;
 };
 
+#if IS_ENABLED(CONFIG_TYPEC) || IS_MODULE(CONFIG_TYPEC)
+
 struct typec_mux *fwnode_typec_mux_get(struct fwnode_handle *fwnode,
 				       const struct typec_altmode_desc *desc);
 void typec_mux_put(struct typec_mux *mux);
@@ -76,4 +78,40 @@ void typec_mux_unregister(struct typec_mux_dev *mux);
 void typec_mux_set_drvdata(struct typec_mux_dev *mux, void *data);
 void *typec_mux_get_drvdata(struct typec_mux_dev *mux);
 
+#else
+
+struct typec_mux *fwnode_typec_mux_get(struct fwnode_handle *fwnode,
+				       const struct typec_altmode_desc *desc)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+void typec_mux_put(struct typec_mux *mux) {}
+
+int typec_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
+{
+	return -EOPNOTSUPP;
+}
+
+static inline struct typec_mux *
+typec_mux_get(struct device *dev, const struct typec_altmode_desc *desc)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+struct typec_mux *
+typec_mux_register(struct device *parent, const struct typec_mux_desc *desc)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+void typec_mux_unregister(struct typec_mux *mux) {}
+
+void typec_mux_set_drvdata(struct typec_mux *mux, void *data) {}
+void *typec_mux_get_drvdata(struct typec_mux *mux)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
+#endif /* CONFIG_TYPEC */
+
 #endif /* __USB_TYPEC_MUX */
-- 
2.36.1.255.ge46751e96f-goog