111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
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/*
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* linux/drivers/video/fb_cmdline.c
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*
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* Copyright (C) 2014 Intel Corp
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* Copyright (C) 1994 Martin Schaller
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*
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* 2001 - Documented with DocBook
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* - Brad Douglas <brad@neruo.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*
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* Authors:
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* Vetter <danie.vetter@ffwll.ch>
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*/
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#include <linux/init.h>
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#include <linux/fb.h>
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static char *video_options[FB_MAX] __read_mostly;
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static int ofonly __read_mostly;
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const char *fb_mode_option;
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EXPORT_SYMBOL_GPL(fb_mode_option);
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/**
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* fb_get_options - get kernel boot parameters
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* @name: framebuffer name as it would appear in
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* the boot parameter line
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* (video=<name>:<options>)
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* @option: the option will be stored here
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*
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* NOTE: Needed to maintain backwards compatibility
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*/
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int fb_get_options(const char *name, char **option)
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{
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char *opt, *options = NULL;
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int retval = 0;
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int name_len = strlen(name), i;
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if (name_len && ofonly && strncmp(name, "offb", 4))
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retval = 1;
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if (name_len && !retval) {
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for (i = 0; i < FB_MAX; i++) {
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if (video_options[i] == NULL)
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continue;
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if (!video_options[i][0])
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continue;
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opt = video_options[i];
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if (!strncmp(name, opt, name_len) &&
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opt[name_len] == ':')
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options = opt + name_len + 1;
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}
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}
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/* No match, pass global option */
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if (!options && option && fb_mode_option)
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options = kstrdup(fb_mode_option, GFP_KERNEL);
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if (options && !strncmp(options, "off", 3))
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retval = 1;
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if (option)
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*option = options;
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return retval;
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}
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EXPORT_SYMBOL(fb_get_options);
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/**
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* video_setup - process command line options
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* @options: string of options
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*
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* Process command line options for frame buffer subsystem.
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*
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* NOTE: This function is a __setup and __init function.
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* It only stores the options. Drivers have to call
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* fb_get_options() as necessary.
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*
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* Returns zero.
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*
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*/
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static int __init video_setup(char *options)
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{
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int i, global = 0;
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if (!options || !*options)
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global = 1;
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if (!global && !strncmp(options, "ofonly", 6)) {
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ofonly = 1;
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global = 1;
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}
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if (!global && !strchr(options, ':')) {
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fb_mode_option = options;
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global = 1;
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}
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if (!global) {
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for (i = 0; i < FB_MAX; i++) {
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if (video_options[i] == NULL) {
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video_options[i] = options;
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break;
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}
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}
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}
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return 1;
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}
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__setup("video=", video_setup);
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