1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <linux/proc_fs.h>
 4
 5#include "fb_internal.h"
 6
 7static struct proc_dir_entry *fb_proc_dir_entry;
 8
 9static void *fb_seq_start(struct seq_file *m, loff_t *pos)
10{
11	mutex_lock(&registration_lock);
12
13	return (*pos < FB_MAX) ? pos : NULL;
14}
15
16static void fb_seq_stop(struct seq_file *m, void *v)
17{
18	mutex_unlock(&registration_lock);
19}
20
21static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
22{
23	(*pos)++;
24
25	return (*pos < FB_MAX) ? pos : NULL;
26}
27
28static int fb_seq_show(struct seq_file *m, void *v)
29{
30	int i = *(loff_t *)v;
31	struct fb_info *fi = registered_fb[i];
32
33	if (fi)
34		seq_printf(m, "%d %s\n", fi->node, fi->fix.id);
35
36	return 0;
37}
38
39static const struct seq_operations __maybe_unused fb_proc_seq_ops = {
40	.start	= fb_seq_start,
41	.stop	= fb_seq_stop,
42	.next	= fb_seq_next,
43	.show	= fb_seq_show,
44};
45
46int fb_init_procfs(void)
47{
48	struct proc_dir_entry *proc;
49
50	proc = proc_create_seq("fb", 0, NULL, &fb_proc_seq_ops);
51	if (!proc)
52		return -ENOMEM;
53
54	fb_proc_dir_entry = proc;
55
56	return 0;
57}
58
59void fb_cleanup_procfs(void)
60{
61	proc_remove(fb_proc_dir_entry);
62}