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rpmsg: glink: Add support for rpmsg glink chrdev 

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>
Signed-off-by: Deepak Kumar Singh <deesin@codeaurora.org>
Link: https://lore.kernel.org/r/1593017121-7953-4-git-send-email-deesin@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Deepak Kumar Singh 2020-06-24 22:15:20 +05:30 committed by Bjorn Andersson
parent d5158cda9e
commit 0f579e5247
1 changed files with 38 additions and 0 deletions
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38
drivers/rpmsg/qcom_glink_native.c
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@ -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);