Allows to probe the endpoint device on a remote name service announcement,
by registering a rpmsg_driverfor the "rpmsg-raw" channel.
With this patch the /dev/rpmsgX interface can be instantiated by the remote
firmware.
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxxxxxxx>
---
update from last version:
- rework the probe function to create the default endpoint before
adding the eptdev.
- clean Reviewed-by and tested-by as code updated.
---
drivers/rpmsg/rpmsg_char.c | 64 ++++++++++++++++++++++++++++++++++++++
1 file changed, 64 insertions(+)
diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
index 632279cd6c97..aef628c6b57c 100644
--- a/drivers/rpmsg/rpmsg_char.c
+++ b/drivers/rpmsg/rpmsg_char.c
@@ -429,6 +429,58 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent
}
EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create);
+static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
+{
+ struct rpmsg_channel_info chinfo;
+ struct rpmsg_eptdev *eptdev;
+ struct device *dev = &rpdev->dev;
+
+ memcpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);
+ chinfo.src = rpdev->src;
+ chinfo.dst = rpdev->dst;
+
+ eptdev = rpmsg_chrdev_eptdev_alloc(rpdev, dev);
+ if (IS_ERR(eptdev))
+ return PTR_ERR(eptdev);
+
+ /*
+ * Create the default endpoint associated to the rpmsg device and provide rpmsg_eptdev
+ * structure as callback private data.
+ * Do not allow the creation and release of an endpoint on /dev/rpmsgX open and close,
+ * reuse the default endpoint instead
+ */
+ eptdev->default_ept = rpmsg_create_default_ept(rpdev, rpmsg_ept_cb, eptdev, chinfo);
+ if (!eptdev->default_ept) {
+ dev_err(&rpdev->dev, "failed to create %s\n", chinfo.name);
+ put_device(dev);
+ kfree(eptdev);
+ return -EINVAL;
+ }
+
+ return rpmsg_chrdev_eptdev_add(eptdev, chinfo);
+}
+
+static void rpmsg_chrdev_remove(struct rpmsg_device *rpdev)
+{
+ int ret;
+
+ ret = device_for_each_child(&rpdev->dev, NULL, rpmsg_chrdev_eptdev_destroy);
+ if (ret)
+ dev_warn(&rpdev->dev, "failed to destroy endpoints: %d\n", ret);
+}
+
+static struct rpmsg_device_id rpmsg_chrdev_id_table[] = {
+ { .name = "rpmsg-raw" },
+ { },
+};
+
+static struct rpmsg_driver rpmsg_chrdev_driver = {
+ .probe = rpmsg_chrdev_probe,
+ .remove = rpmsg_chrdev_remove,
+ .id_table = rpmsg_chrdev_id_table,
+ .drv.name = "rpmsg_chrdev",
+};
+
static int rpmsg_chrdev_init(void)
{
int ret;
@@ -439,12 +491,24 @@ static int rpmsg_chrdev_init(void)
return ret;
}
+ ret = register_rpmsg_driver(&rpmsg_chrdev_driver);
+ if (ret < 0) {
+ pr_err("rpmsg: failed to register rpmsg raw driver\n");
+ goto free_region;
+ }
+
return 0;
+
+free_region:
+ unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
+
+ return ret;
}
postcore_initcall(rpmsg_chrdev_init);
static void rpmsg_chrdev_exit(void)
{
+ unregister_rpmsg_driver(&rpmsg_chrdev_driver);
unregister_chrdev_region(rpmsg_major, RPMSG_DEV_MAX);
}
module_exit(rpmsg_chrdev_exit);
--
2.17.1
