linux-kernel - [PATCH v4 2/2] remoteproc: core: Register the character device interface

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Date:   Tue,  7 Jul 2020 12:07:50 -0700
From:   Siddharth Gupta <sidgup@...eaurora.org>
To:     agross@...nel.org, bjorn.andersson@...aro.org, ohad@...ery.com,
        corbet@....net
Cc:     Siddharth Gupta <sidgup@...eaurora.org>,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, tsoni@...eaurora.org,
        psodagud@...eaurora.org, rishabhb@...eaurora.org,
        linux-doc@...r.kernel.org
Subject: [PATCH v4 2/2] remoteproc: core: Register the character device interface

Add the character device during rproc_add. This would create
a character device node at /dev/remoteproc<index>. Userspace
applications can interact with the remote processor using this
interface.

Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
Signed-off-by: Siddharth Gupta <sidgup@...eaurora.org>
---
 drivers/remoteproc/remoteproc_core.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 0f95e02..ec7fb49 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1966,6 +1966,13 @@ int rproc_add(struct rproc *rproc)
 	struct device *dev = &rproc->dev;
 	int ret;
 
+	/* add char device for this remoteproc */
+	ret = rproc_char_device_add(rproc);
+	if (ret) {
+		dev_err(dev, "Failed to add char dev for %s\n", rproc->name);
+		return ret;
+	}
+
 	ret = device_add(dev);
 	if (ret < 0)
 		return ret;
@@ -2241,6 +2248,7 @@ int rproc_del(struct rproc *rproc)
 	mutex_unlock(&rproc->lock);
 
 	rproc_delete_debug_dir(rproc);
+	rproc_char_device_remove(rproc);
 
 	/* the rproc is downref'ed as soon as it's removed from the klist */
 	mutex_lock(&rproc_list_mutex);
@@ -2409,6 +2417,7 @@ static int __init remoteproc_init(void)
 {
 	rproc_init_sysfs();
 	rproc_init_debugfs();
+	rproc_init_cdev();
 	rproc_init_panic();
 
 	return 0;
@@ -2420,6 +2429,7 @@ static void __exit remoteproc_exit(void)
 	ida_destroy(&rproc_dev_index);
 
 	rproc_exit_panic();
+	rproc_exit_cdev();
 	rproc_exit_debugfs();
 	rproc_exit_sysfs();
 }
-- 
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