linux-kernel - [PATCH v2 06/16] rpmsg: add helper to register the rpmsg ctrl device

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Date:   Tue, 22 Dec 2020 11:57:16 +0100
From:   Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Andy Gross <agross@...nel.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-msm@...r.kernel.org>, <arnaud.pouliquen@...s.st.com>
Subject: [PATCH v2 06/16] rpmsg: add helper to register the rpmsg ctrl device

This function registers a rpmsg_ctl device and its associated
/dev/rpmsg_ctrl interface.

Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
---
 drivers/rpmsg/rpmsg_ctrl.c | 16 ++++++++++++++++
 include/linux/rpmsg.h      |  7 +++++++
 2 files changed, 23 insertions(+)

diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c
index 8381b5b2b794..e4b0ca6dffe3 100644
--- a/drivers/rpmsg/rpmsg_ctrl.c
+++ b/drivers/rpmsg/rpmsg_ctrl.c
@@ -271,6 +271,22 @@ void rpmsg_ctrl_unregister_ctl(const struct rpmsg_drv_ctrl_info *ctrl)
 }
 EXPORT_SYMBOL(rpmsg_ctrl_unregister_ctl);
 
+/**
+ * rpmsg_ctl_register_device() - register control device based on rpdev
+ * @rpdev:	prepared rpdev to be used for creating endpoints
+ *
+ * This function wraps rpmsg_register_device() preparing the rpdev for use as
+ * a control rpmsg driver forcing the channel name.
+ */
+int rpmsg_ctl_register_device(struct rpmsg_device *rpdev)
+{
+	strcpy(rpdev->id.name, KBUILD_MODNAME);
+	rpdev->driver_override = KBUILD_MODNAME;
+
+	return rpmsg_register_device(rpdev);
+}
+EXPORT_SYMBOL(rpmsg_ctl_register_device);
+
 static int rpmsg_ctrl_init(void)
 {
 	int ret;
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 5681c585e235..86540528325f 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -335,6 +335,8 @@ static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept,
 int  rpmsg_ctrl_register_ctl(const struct rpmsg_drv_ctrl_info *ctrl);
 void rpmsg_ctrl_unregister_ctl(const struct rpmsg_drv_ctrl_info *ctrl);
 
+int rpmsg_ctl_register_device(struct rpmsg_device *rpdev);
+
 #else
 
 static inline int rpmsg_ctrl_register_ctl(const struct rpmsg_drv_ctrl_info *ctrl)
@@ -346,6 +348,11 @@ static inline void rpmsg_ctrl_unregister_ctl(const struct rpmsg_drv_ctrl_info *c
 {
 }
 
+static inline int rpmsg_ctl_register_device(struct rpmsg_device *rpdev)
+{
+	return 0;
+}
+
 #endif /* IS_ENABLED(CONFIG_RPMSG_CTRL) */
 
 #endif /* _LINUX_RPMSG_H */
-- 
2.17.1