Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / video / fbdev / core / fb_cmdline.c

diff --git a/kernel/drivers/video/fbdev/core/fb_cmdline.c b/kernel/drivers/video/fbdev/core/fb_cmdline.c
new file mode 100644 (file)
index 0000000..39509cc
--- /dev/null
+++ b/kernel/drivers/video/fbdev/core/fb_cmdline.c
@@ -0,0 +1,110 @@
+/*
+ *  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);