1 files changed, 62 insertions, 0 deletions
diff --git a/drivers/video/fbdev/core/fb_procfs.c b/drivers/video/fbdev/core/fb_procfs.c
new file mode 100644
index 000000000000..59641142f8aa
--- /dev/null
+++ b/drivers/video/fbdev/core/fb_procfs.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/proc_fs.h>
+
+#include "fb_internal.h"
+
+static struct proc_dir_entry *fb_proc_dir_entry;
+
+static void *fb_seq_start(struct seq_file *m, loff_t *pos)
+{
+	mutex_lock(&registration_lock);
+
+	return (*pos < FB_MAX) ? pos : NULL;
+}
+
+static void fb_seq_stop(struct seq_file *m, void *v)
+{
+	mutex_unlock(&registration_lock);
+}
+
+static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+	(*pos)++;
+
+	return (*pos < FB_MAX) ? pos : NULL;
+}
+
+static int fb_seq_show(struct seq_file *m, void *v)
+{
+	int i = *(loff_t *)v;
+	struct fb_info *fi = registered_fb[i];
+
+	if (fi)
+		seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
+
+	return 0;
+}
+
+static const struct seq_operations __maybe_unused fb_proc_seq_ops = {
+	.start	= fb_seq_start,
+	.stop	= fb_seq_stop,
+	.next	= fb_seq_next,
+	.show	= fb_seq_show,
+};
+
+int fb_init_procfs(void)
+{
+	struct proc_dir_entry *proc;
+
+	proc = proc_create_seq("fb", 0, NULL, &fb_proc_seq_ops);
+	if (!proc)
+		return -ENOMEM;
+
+	fb_proc_dir_entry = proc;
+
+	return 0;
+}
+
+void fb_cleanup_procfs(void)
+{
+	proc_remove(fb_proc_dir_entry);
+}