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Subject[PATCH v3 4/4] rpmsg: smd: Register rpmsg user space interface for edges
Date
Create and register a rpmsg device for use with the rpmsg user space
interface, allowing user space to access SMD channels.

Also provide the "rpmsg_name" device attribute to expose the edge name
in sysfs, allowing the user to write udev rules for specific rpmsg
devices and their children.

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

Changes since v2:
- None

Changes since v1:
- Moved rpmsg_name attribute to different patch

drivers/rpmsg/qcom_smd.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)

diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index 9e2af6a18aa2..beaef5dd973e 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -1002,6 +1002,20 @@ static int qcom_smd_create_device(struct qcom_smd_channel *channel)
return rpmsg_register_device(rpdev);
}

+static int qcom_smd_create_chrdev(struct qcom_smd_edge *edge)
+{
+ struct qcom_smd_device *qsdev;
+
+ qsdev = kzalloc(sizeof(*qsdev), GFP_KERNEL);
+ if (!qsdev)
+ return -ENOMEM;
+
+ qsdev->edge = edge;
+ qsdev->rpdev.ops = &qcom_smd_device_ops;
+ qsdev->rpdev.dev.parent = &edge->dev;
+ return rpmsg_chrdev_register_device(&qsdev->rpdev);
+}
+
/*
* Allocate the qcom_smd_channel object for a newly found smd channel,
* retrieving and validating the smem items involved.
@@ -1357,6 +1371,12 @@ struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent,
goto unregister_dev;
}

+ ret = qcom_smd_create_chrdev(edge);
+ if (ret) {
+ dev_err(&edge->dev, "failed to register chrdev for edge\n");
+ goto unregister_dev;
+ }
+
schedule_work(&edge->scan_work);

return edge;
--
2.11.0
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