forked from Minki/linux
a41458d74c
Make the video_setup() function slightly easier to read by removing the repeated checks for !global. Remove the misleading return value comment while at it. I'm slightly hesitant to change any of this, but here goes anyway, with hopes that the next person to have to look at this has it a wee bit easier. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
108 lines
2.4 KiB
C
108 lines
2.4 KiB
C
/*
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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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static int __init video_setup(char *options)
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{
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if (!options || !*options)
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goto out;
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if (!strncmp(options, "ofonly", 6)) {
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ofonly = 1;
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goto out;
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}
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if (strchr(options, ':')) {
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/* named */
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int i;
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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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} else {
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/* global */
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fb_mode_option = options;
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}
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out:
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return 1;
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}
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__setup("video=", video_setup);
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