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