// SPDX-License-Identifier: GPL-2.0/* * Based on the fbdev code in drivers/video/fbdev/core/fb_cmdline: * *  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: *    Daniel Vetter <daniel.vetter@ffwll.ch> */ #include <linux/fb.h> /* for FB_MAX */#include <linux/init.h> #include <video/cmdline.h> /* * FB_MAX is the maximum number of framebuffer devices and also * the maximum number of video= parameters. Although not directly * related to each other, it makes sense to keep it that way. */static const char *video_options[FB_MAX] __read_mostly;static const char *video_option __read_mostly;static int video_of_only __read_mostly; static const char *__video_get_option_string(const char *name){	const char *options = NULL;	size_t name_len = 0; 	if (name)		name_len = strlen(name); 	if (name_len) {		unsigned int i;		const char *opt; 		for (i = 0; i < ARRAY_SIZE(video_options); ++i) {			if (!video_options[i])				continue;			if (video_options[i][0] == '\0')				continue;			opt = video_options[i];			if (!strncmp(opt, name, name_len) && opt[name_len] == ':')				options = opt + name_len + 1;		}	} 	/* No match, return global options */	if (!options)		options = video_option; 	return options;} /** * video_get_options - get kernel boot parameters * @name:	name of the output as it would appear in the boot parameter *		line (video=<name>:<options>) * * Looks up the video= options for the given name. Names are connector * names with DRM, or driver names with fbdev. If no video option for * the name has been specified, the function returns the global video= * setting. A @name of NULL always returns the global video setting. * * Returns: * The string of video options for the given name, or NULL if no video * option has been specified. */const char *video_get_options(const char *name){	return __video_get_option_string(name);}EXPORT_SYMBOL(video_get_options); #if IS_ENABLED(CONFIG_FB_CORE)bool __video_get_options(const char *name, const char **options, bool is_of){	bool enabled = true;	const char *opt = NULL; 	if (video_of_only && !is_of)		enabled = false; 	opt = __video_get_option_string(name); 	if (options)		*options = opt; 	return enabled;}EXPORT_SYMBOL(__video_get_options);#endif /* * Process command line options for video adapters. This function is * a __setup and __init function. It only stores the options. Drivers * have to call video_get_options() as necessary. */static int __init video_setup(char *options){	if (!options || !*options)		goto out; 	if (!strncmp(options, "ofonly", 6)) {		video_of_only = true;		goto out;	} 	if (strchr(options, ':')) {		/* named */		size_t i; 		for (i = 0; i < ARRAY_SIZE(video_options); i++) {			if (!video_options[i]) {				video_options[i] = options;				break;			}		}	} else {		/* global */		video_option = options;	} out:	return 1;}__setup("video=", video_setup);