1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/proc_fs.h>
4
5 #include "fb_internal.h"
6
7 static struct proc_dir_entry *fb_proc_dir_entry;
8
fb_seq_start(struct seq_file * m,loff_t * pos)9 static void *fb_seq_start(struct seq_file *m, loff_t *pos)
10 {
11 mutex_lock(®istration_lock);
12
13 return (*pos < FB_MAX) ? pos : NULL;
14 }
15
fb_seq_stop(struct seq_file * m,void * v)16 static void fb_seq_stop(struct seq_file *m, void *v)
17 {
18 mutex_unlock(®istration_lock);
19 }
20
fb_seq_next(struct seq_file * m,void * v,loff_t * pos)21 static 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
fb_seq_show(struct seq_file * m,void * v)28 static 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
39 static 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
fb_init_procfs(void)46 int 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
fb_cleanup_procfs(void)59 void fb_cleanup_procfs(void)
60 {
61 proc_remove(fb_proc_dir_entry);
62 }
63