linux-kernel - [PATCH v2 2/2] remoteproc: core: Register the character device interface

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Date:   Tue, 31 Mar 2020 17:03:58 -0700
From:   Rishabh Bhatnagar <rishabhb@...eaurora.org>
To:     linux-kernel@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        bjorn.andersson@...aro.org
Cc:     psodagud@...eaurora.org, tsoni@...eaurora.org,
        sidgup@...eaurora.org, Rishabh Bhatnagar <rishabhb@...eaurora.org>
Subject: [PATCH v2 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>
---
 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 097f33e..76ba171 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1916,6 +1916,13 @@ int rproc_add(struct rproc *rproc)
 	/* create debugfs entries */
 	rproc_create_debug_dir(rproc);
 
+	/* 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;
+	}
+
 	/* if rproc is marked always-on, request it to boot */
 	if (rproc->auto_boot) {
 		ret = rproc_trigger_auto_boot(rproc);
@@ -2137,6 +2144,7 @@ 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);
@@ -2220,6 +2228,7 @@ static int __init remoteproc_init(void)
 {
 	rproc_init_sysfs();
 	rproc_init_debugfs();
+	rproc_init_cdev();
 
 	return 0;
 }
@@ -2231,6 +2240,7 @@ static void __exit remoteproc_exit(void)
 
 	rproc_exit_debugfs();
 	rproc_exit_sysfs();
+	rproc_exit_cdev();
 }
 module_exit(remoteproc_exit);
 
-- 
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