mirror of
https://github.com/torvalds/linux.git
synced 2025-01-01 15:51:46 +00:00
ea6763c104
In drm/i915 we want to get at the video= cmdline modes even when we don't have fbdev support enabled, so that users can always override the kernel's initial mode selection. But that gives us a direct depency upon the parsing code in the fbdev subsystem. Since it's so little code just extract these 2 functions and always build them in. Whiel at it fix the checkpatch fail in this code. v2: Also move fb_mode_option. Spotted by the kbuild. v3: Review from Geert: - Keep the old copyright notice from fb_mem.c, although I have no idea what exactly applies. - Only compile this when needed. Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Plagniol-Villard <plagnioj@jcrosoft.com> Cc: Tomi Valkeinen <tomi.valkeinen@ti.com> Cc: linux-fbdev@vger.kernel.org Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> -- I prefer if we can merge this through drm-next since we'll use it there in follow-up patches. -Daniel
111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* Returns zero.
|
|
*
|
|
*/
|
|
static int __init video_setup(char *options)
|
|
{
|
|
int i, global = 0;
|
|
|
|
if (!options || !*options)
|
|
global = 1;
|
|
|
|
if (!global && !strncmp(options, "ofonly", 6)) {
|
|
ofonly = 1;
|
|
global = 1;
|
|
}
|
|
|
|
if (!global && !strchr(options, ':')) {
|
|
fb_mode_option = options;
|
|
global = 1;
|
|
}
|
|
|
|
if (!global) {
|
|
for (i = 0; i < FB_MAX; i++) {
|
|
if (video_options[i] == NULL) {
|
|
video_options[i] = options;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
__setup("video=", video_setup);
|