rpmsg: Provide function stubs for API

Provide function stubs for the rpmsg API to allow clients to be compile
tested without having CONFIG_RPMSG enabled.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 7ad6c20..18f9e1a 100644 (file)
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -37,6 +37,7 @@
 
 #include <linux/types.h>
 #include <linux/device.h>
+#include <linux/err.h>
 #include <linux/mod_devicetable.h>
 #include <linux/kref.h>
 #include <linux/mutex.h>
@@ -134,6 +135,8 @@ struct rpmsg_driver {
        int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
 };
 
+#if IS_ENABLED(CONFIG_RPMSG)
+
 int register_rpmsg_device(struct rpmsg_device *dev);
 void unregister_rpmsg_device(struct rpmsg_device *dev);
 int __register_rpmsg_driver(struct rpmsg_driver *drv, struct module *owner);
@@ -143,6 +146,116 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
                                        rpmsg_rx_cb_t cb, void *priv,
                                        struct rpmsg_channel_info chinfo);
 
+int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
+int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
+                         void *data, int len);
+
+int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
+int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
+                            void *data, int len);
+
+#else
+
+static inline int register_rpmsg_device(struct rpmsg_device *dev)
+{
+       return -ENXIO;
+}
+
+static inline void unregister_rpmsg_device(struct rpmsg_device *dev)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+}
+
+static inline int __register_rpmsg_driver(struct rpmsg_driver *drv,
+                                         struct module *owner)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+
+       return -ENXIO;
+}
+
+static inline void unregister_rpmsg_driver(struct rpmsg_driver *drv)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+}
+
+static inline void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+}
+
+static inline struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev,
+                                                     rpmsg_rx_cb_t cb,
+                                                     void *priv,
+                                                     struct rpmsg_channel_info chinfo)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+
+       return ERR_PTR(-ENXIO);
+}
+
+static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+
+       return -ENXIO;
+}
+
+static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
+                              u32 dst)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+
+       return -ENXIO;
+
+}
+
+static inline int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src,
+                                       u32 dst, void *data, int len)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+
+       return -ENXIO;
+}
+
+static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+
+       return -ENXIO;
+}
+
+static inline int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+                                 int len, u32 dst)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+
+       return -ENXIO;
+}
+
+static inline int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
+                                          u32 dst, void *data, int len)
+{
+       /* This shouldn't be possible */
+       WARN_ON(1);
+
+       return -ENXIO;
+}
+
+#endif /* IS_ENABLED(CONFIG_RPMSG) */
+
 /* use a macro to avoid include chaining to get THIS_MODULE */
 #define register_rpmsg_driver(drv) \
        __register_rpmsg_driver(drv, THIS_MODULE)
@@ -159,14 +272,4 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
        module_driver(__rpmsg_driver, register_rpmsg_driver, \
                        unregister_rpmsg_driver)
 
-int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
-int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
-int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
-                         void *data, int len);
-
-int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
-int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
-int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
-                            void *data, int len);
-
 #endif /* _LINUX_RPMSG_H */