2 * linux/drivers/video/fb_cmdline.c
4 * Copyright (C) 2014 Intel Corp
5 * Copyright (C) 1994 Martin Schaller
7 * 2001 - Documented with DocBook
8 * - Brad Douglas <brad@neruo.com>
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file COPYING in the main directory of this archive
15 * Vetter <danie.vetter@ffwll.ch>
17 #include <linux/init.h>
20 static char *video_options[FB_MAX] __read_mostly;
21 static int ofonly __read_mostly;
23 const char *fb_mode_option;
24 EXPORT_SYMBOL_GPL(fb_mode_option);
27 * fb_get_options - get kernel boot parameters
28 * @name: framebuffer name as it would appear in
29 * the boot parameter line
30 * (video=<name>:<options>)
31 * @option: the option will be stored here
33 * NOTE: Needed to maintain backwards compatibility
35 int fb_get_options(const char *name, char **option)
37 char *opt, *options = NULL;
39 int name_len = strlen(name), i;
41 if (name_len && ofonly && strncmp(name, "offb", 4))
44 if (name_len && !retval) {
45 for (i = 0; i < FB_MAX; i++) {
46 if (video_options[i] == NULL)
48 if (!video_options[i][0])
50 opt = video_options[i];
51 if (!strncmp(name, opt, name_len) &&
53 options = opt + name_len + 1;
56 /* No match, pass global option */
57 if (!options && option && fb_mode_option)
58 options = kstrdup(fb_mode_option, GFP_KERNEL);
59 if (options && !strncmp(options, "off", 3))
67 EXPORT_SYMBOL(fb_get_options);
70 * video_setup - process command line options
71 * @options: string of options
73 * Process command line options for frame buffer subsystem.
75 * NOTE: This function is a __setup and __init function.
76 * It only stores the options. Drivers have to call
77 * fb_get_options() as necessary.
82 static int __init video_setup(char *options)
86 if (!options || !*options)
89 if (!global && !strncmp(options, "ofonly", 6)) {
94 if (!global && !strchr(options, ':')) {
95 fb_mode_option = options;
100 for (i = 0; i < FB_MAX; i++) {
101 if (video_options[i] == NULL) {
102 video_options[i] = options;
110 __setup("video=", video_setup);