soc: qcom: smd: Introduce compile stubs

Introduce compile stubs for the SMD API, allowing consumers to be
compile tested.

Acked-by: Andy Gross <andy.gross@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 27 insertions, 1 deletions

diff --git a/include/linux/soc/qcom/smd.h b/include/linux/soc/qcom/smd.h
index d0cb6d189a0a..46a984f5e3a3 100644
--- a/include/linux/soc/qcom/smd.h
+++ b/include/linux/soc/qcom/smd.h
@@ -45,13 +45,39 @@ struct qcom_smd_driver {
         int (*callback)(struct qcom_smd_device *, const void *, size_t);
 };
 
+#if IS_ENABLED(CONFIG_QCOM_SMD)
+
 int qcom_smd_driver_register(struct qcom_smd_driver *drv);
 void qcom_smd_driver_unregister(struct qcom_smd_driver *drv);
 
+int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len);
+
+#else
+
+static inline int qcom_smd_driver_register(struct qcom_smd_driver *drv)
+{
+        return -ENXIO;
+}
+
+static inline void qcom_smd_driver_unregister(struct qcom_smd_driver *drv)
+{
+        /* This shouldn't be possible */
+        WARN_ON(1);
+}
+
+static inline int qcom_smd_send(struct qcom_smd_channel *channel,
+                                const void *data, int len)
+{
+        /* This shouldn't be possible */
+        WARN_ON(1);
+        return -ENXIO;
+}
+
+#endif
+
 #define module_qcom_smd_driver(__smd_driver) \
         module_driver(__smd_driver, qcom_smd_driver_register, \
                       qcom_smd_driver_unregister)
 
-int qcom_smd_send(struct qcom_smd_channel *channel, const void *data, int len);
 
 #endif