Add support for client's to query the edge name their channel is
registered for. This is useful for clients who share the same channel
identifier across different remote procs.
Signed-off-by: Chris Lew <clew@xxxxxxxxxxxxxx>
---
drivers/rpmsg/rpmsg_core.c | 21 +++++++++++++++++++++
drivers/rpmsg/rpmsg_internal.h | 3 +++
include/linux/rpmsg.h | 10 ++++++++++
3 files changed, 34 insertions(+)
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index dffa3aab7178..d6ebd678b089 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -78,6 +78,27 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev,
}
EXPORT_SYMBOL(rpmsg_create_ept);
+
+/**
+ * rpmsg_get_rproc_name() - Return the name of the rproc for this device
+ * @rpdev: rpmsg channel device
+ *
+ * Expose the rproc name for clients who open the same channel across different
+ * rprocs and need to differentiate during their probe.
+ *
+ * Returns char string on success and NULL on failure.
+ */
+const char *rpmsg_get_rproc_name(struct rpmsg_device *rpdev)
+{
+ if (WARN_ON(!rpdev))
+ return NULL;
+
+ if (!rpdev->ops->get_rproc_name)
+ return NULL;
+
+ return rpdev->ops->get_rproc_name(rpdev);
+}
+
/**
* rpmsg_destroy_ept() - destroy an existing rpmsg endpoint
* @ept: endpoing to destroy
diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h
index 0cf9c7e2ee83..83a028b6883f 100644
--- a/drivers/rpmsg/rpmsg_internal.h
+++ b/drivers/rpmsg/rpmsg_internal.h
@@ -31,6 +31,7 @@
* @create_ept: create backend-specific endpoint, requried
* @announce_create: announce presence of new channel, optional
* @announce_destroy: announce destruction of channel, optional
+ * @get_rproc_name: return name of the rproc for this device, optional
*
* Indirection table for the operations that a rpmsg backend should implement.
* @announce_create and @announce_destroy are optional as the backend might
@@ -43,6 +44,8 @@ struct rpmsg_device_ops {
int (*announce_create)(struct rpmsg_device *ept);
int (*announce_destroy)(struct rpmsg_device *ept);
+
+ const char *(*get_rproc_name)(struct rpmsg_device *rpdev);
};
/**
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 10d6ae8bbb7d..167982dc5b4f 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -160,6 +160,8 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
unsigned int rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp,
poll_table *wait);
+const char *rpmsg_get_rproc_name(struct rpmsg_device *dev);
+
#else
static inline int register_rpmsg_device(struct rpmsg_device *dev)
@@ -267,6 +269,14 @@ static inline unsigned int rpmsg_poll(struct rpmsg_endpoint *ept,
return 0;
}
+static inline const char *rpmsg_get_rproc_name(struct rpmsg_device *rpdev)
+{
+ /* This shouldn't be possible */
+ WARN_ON(1);
+
+ return NULL;
+}
+
#endif /* IS_ENABLED(CONFIG_RPMSG) */
/* use a macro to avoid include chaining to get THIS_MODULE */
--
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