kernel/printk/braille.c

   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
  12 int _braille_console_setup(char **str, char **brl_options)
  13 {
  14         if (!strncmp(*str, "brl,", 4)) {
  15                 *brl_options = "";
  16                 *str += 4;
  17         } else if (!strncmp(*str, "brl=", 4)) {
  18                 *brl_options = *str + 4;
  19                 *str = strchr(*brl_options, ',');
  20                 if (!*str) {
  21                         pr_err("need port name after brl=\n");
  22                         return -EINVAL;
  23                 }
  24                 *((*str)++) = 0;
  25         }
  26
  27         return 0;
  28 }
  29
  30 int
  31 _braille_register_console(struct console *console, struct console_cmdline *c)
  32 {
  33         int rtn = 0;
  34
  35         if (c->brl_options) {
  36                 console->flags |= CON_BRL;
  37                 rtn = braille_register_console(console, c->index, c->options,
  38                                                c->brl_options);
  39         }
  40
  41         return rtn;
  42 }
  43
  44 int
  45 _braille_unregister_console(struct console *console)
  46 {
  47         if (console->flags & CON_BRL)
  48                 return braille_unregister_console(console);
  49
  50         return 0;
  51 }