1// SPDX-License-Identifier: GPL-2.0
2#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
3
4#include <linux/kernel.h>
5#include <linux/console.h>
6#include <linux/errno.h>
7#include <linux/string.h>
8
9#include "console_cmdline.h"
10#include "braille.h"
11
12int _braille_console_setup(char **str, char **brl_options)
13{
14 size_t len;
15
16 len = str_has_prefix(str: *str, prefix: "brl,");
17 if (len) {
18 *brl_options = "";
19 *str += len;
20 return 0;
21 }
22
23 len = str_has_prefix(str: *str, prefix: "brl=");
24 if (len) {
25 *brl_options = *str + len;
26 *str = strchr(*brl_options, ',');
27 if (!*str) {
28 pr_err("need port name after brl=\n");
29 return -EINVAL;
30 }
31 *((*str)++) = 0;
32 }
33
34 return 0;
35}
36
37int
38_braille_register_console(struct console *console, struct console_cmdline *c)
39{
40 int rtn = 0;
41
42 if (c->brl_options) {
43 console->flags |= CON_BRL;
44 rtn = braille_register_console(console, index: c->index, console_options: c->options,
45 braille_options: c->brl_options);
46 }
47
48 return rtn;
49}
50
51int
52_braille_unregister_console(struct console *console)
53{
54 if (console->flags & CON_BRL)
55 return braille_unregister_console(console);
56
57 return 0;
58}
59

source code of linux/kernel/printk/braille.c