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From: Arun Kumar Neelakantam <aneela@codeaurora.org>
To: ohad@wizery.com, bjorn.andersson@linaro.org, clew@codeaurora.org,
	sricharan@codeaurora.org
Cc: linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
	Arun Kumar Neelakantam <aneela@codeaurora.org>,
	Andy Gross <agross@kernel.org>,
	linux-arm-msm@vger.kernel.org (open list:ARM/QUALCOMM SUPPORT)
Subject: [PATCH V6 3/5] rpmsg: glink: Add support for rpmsg glink chrdev
Date: Wed, 20 May 2020 15:09:37 +0530	[thread overview]
Message-ID: <1589967579-15559-4-git-send-email-aneela@codeaurora.org> (raw)
In-Reply-To: <1589967579-15559-1-git-send-email-aneela@codeaurora.org>

From: Chris Lew <clew@codeaurora.org>

RPMSG provides a char device interface to userspace. Probe the rpmsg
chrdev channel to enable the rpmsg_ctrl device creation on glink
transports.

Signed-off-by: Chris Lew <clew@codeaurora.org>
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
---
 drivers/rpmsg/qcom_glink_native.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index ea2f33f..b85433c 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -1574,6 +1574,40 @@ static void qcom_glink_cancel_rx_work(struct qcom_glink *glink)
 		kfree(dcmd);
 }
 
+static void qcom_glink_device_release(struct device *dev)
+{
+	struct rpmsg_device *rpdev = to_rpmsg_device(dev);
+	struct glink_channel *channel = to_glink_channel(rpdev->ept);
+
+	/* Release qcom_glink_alloc_channel() reference */
+	kref_put(&channel->refcount, qcom_glink_channel_release);
+	kfree(rpdev);
+}
+
+static int qcom_glink_create_chrdev(struct qcom_glink *glink)
+{
+	struct rpmsg_device *rpdev;
+	struct glink_channel *channel;
+
+	rpdev = kzalloc(sizeof(*rpdev), GFP_KERNEL);
+	if (!rpdev)
+		return -ENOMEM;
+
+	channel = qcom_glink_alloc_channel(glink, "rpmsg_chrdev");
+	if (IS_ERR(channel)) {
+		kfree(rpdev);
+		return PTR_ERR(channel);
+	}
+	channel->rpdev = rpdev;
+
+	rpdev->ept = &channel->ept;
+	rpdev->ops = &glink_device_ops;
+	rpdev->dev.parent = glink->dev;
+	rpdev->dev.release = qcom_glink_device_release;
+
+	return rpmsg_chrdev_register_device(rpdev);
+}
+
 struct qcom_glink *qcom_glink_native_probe(struct device *dev,
 					   unsigned long features,
 					   struct qcom_glink_pipe *rx,
@@ -1633,6 +1667,10 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev,
 	if (ret)
 		return ERR_PTR(ret);
 
+	ret = qcom_glink_create_chrdev(glink);
+	if (ret)
+		dev_err(glink->dev, "failed to register chrdev\n");
+
 	return glink;
 }
 EXPORT_SYMBOL_GPL(qcom_glink_native_probe);
-- 
2.7.4

  parent reply	other threads:[~2020-05-20  9:40 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-20  9:39 [PATCH V5 0/5] Add chrdev and name query support for GLINK Arun Kumar Neelakantam
2020-05-20  9:39 ` [PATCH V6 1/5] rpmsg: glink: Use complete_all for open states Arun Kumar Neelakantam
2020-05-20  9:39 ` [PATCH V6 2/5] rpmsg: Guard against null endpoint ops in destroy Arun Kumar Neelakantam
2020-05-20  9:39 ` Arun Kumar Neelakantam [this message]
2020-05-20  9:39 ` [PATCH V6 4/5] rpmsg: glink: Expose rpmsg name attr for glink Arun Kumar Neelakantam
2020-05-20  9:39 ` [PATCH V6 5/5] rpmsg: glink: unregister rpmsg device during endpoint destroy Arun Kumar Neelakantam

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