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

Rishabh Bhatnagar
2020-04-01T00:04:16Z

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@codeaurora.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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