93604a5ade
Handle the command-line parameter video= in video/cmdline.c. Implement the fbdev helper fb_get_options() on top. Will allows to handle the kernel parameter in DRM without fbdev dependencies. Note that __video_get_options() has the meaning of its return value inverted compared to fb_get_options(). The new helper returns true if the adapter has been enabled, and false otherwise. There is the ofonly parameter, which disables output for non-OF-based framebuffers. It is only for offb and looks like a workaround. The actual purpose it not clear to me. Use 'video=off' or 'nomodeset' instead. Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20230209135509.7786-9-tzimmermann@suse.de
61 lines
1.4 KiB
C
61 lines
1.4 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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* Daniel Vetter <daniel.vetter@ffwll.ch>
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*/
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#include <linux/export.h>
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#include <linux/fb.h>
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#include <linux/string.h>
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#include <video/cmdline.h>
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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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* The caller owns the string returned in @option and is
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* responsible for releasing the memory.
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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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const char *options = NULL;
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bool is_of = false;
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bool enabled;
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if (name)
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is_of = strncmp(name, "offb", 4);
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enabled = __video_get_options(name, &options, is_of);
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if (options) {
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if (!strncmp(options, "off", 3))
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enabled = false;
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}
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if (option) {
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if (options)
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*option = kstrdup(options, GFP_KERNEL);
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else
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*option = NULL;
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}
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return enabled ? 0 : 1; // 0 on success, 1 otherwise
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}
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EXPORT_SYMBOL(fb_get_options);
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