rpmsg: smd: Register rpmsg user space interface for edges

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>

diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index 9e2af6a18aa20edfb9e9b52646d9fc456357c1ae..beaef5dd973ebe67dfcccc08232a63e9f71da3a9 100644 (file)
--- 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;