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.

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>
Signed-off-by: Siddharth Gupta <sidgup@codeaurora.org>
Link: https://lore.kernel.org/r/1596044401-22083-3-git-send-email-sidgup@codeaurora.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 277d3bf..7f90eee 100644 (file)
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1986,6 +1986,11 @@ 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 < 0)
+               return ret;
+
        /*
         * Remind ourselves the remote processor has been attached to rather
         * than booted by the remoteproc core.  This is important because the
@@ -2262,6 +2267,7 @@ 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);
@@ -2430,6 +2436,7 @@ static int __init remoteproc_init(void)
 {
        rproc_init_sysfs();
        rproc_init_debugfs();
+       rproc_init_cdev();
        rproc_init_panic();
 
        return 0;