linux-kernel - [PATCH V4 6/9] rpmsg: glink: Expose rpmsg name attr for glink

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Date:   Fri, 27 Jul 2018 17:47:26 +0530
From:   Arun Kumar Neelakantam <aneela@...eaurora.org>
To:     ohad@...ery.com, bjorn.andersson@...aro.org, clew@...eaurora.org,
        robh+dt@...nel.org, arnaud.pouliquen@...com, andy.gross@...aro.org
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Arun Kumar Neelakantam <aneela@...eaurora.org>
Subject: [PATCH V4 6/9] rpmsg: glink: Expose rpmsg name attr for glink

From: Chris Lew <clew@...eaurora.org>

Expose the name field as an attr so clients listening to uevents for
rpmsg can identify the edge the events correspond to.

Signed-off-by: Chris Lew <clew@...eaurora.org>
Signed-off-by: Arun Kumar Neelakantam <aneela@...eaurora.org>
---
 drivers/rpmsg/qcom_glink_native.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 9f3d026..7b4ffa0 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -1544,6 +1544,26 @@ static void qcom_glink_work(struct work_struct *work)
 	}
 }
 
+static ssize_t rpmsg_name_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	int ret = 0;
+	const char *name;
+
+	ret = of_property_read_string(dev->of_node, "label", &name);
+	if (ret < 0)
+		name = dev->of_node->name;
+
+	return snprintf(buf, RPMSG_NAME_SIZE, "%s\n", name);
+}
+static DEVICE_ATTR_RO(rpmsg_name);
+
+static struct attribute *qcom_glink_attrs[] = {
+	&dev_attr_rpmsg_name.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(qcom_glink);
+
 static void qcom_glink_device_release(struct device *dev)
 {
 	struct rpmsg_device *rpdev = to_rpmsg_device(dev);
@@ -1593,6 +1613,12 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev,
 		return ERR_PTR(-ENOMEM);
 
 	glink->dev = dev;
+	glink->dev->groups = qcom_glink_groups;
+
+	ret = device_add_groups(dev, qcom_glink_groups);
+	if (ret)
+		dev_err(dev, "failed to add groups\n");
+
 	glink->tx_pipe = tx;
 	glink->rx_pipe = rx;
 
-- 
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