Line data    Source code

       1             : /*
       2             :  *  linux/drivers/video/fb_cmdline.c
       3             :  *
       4             :  *  Copyright (C) 2014 Intel Corp
       5             :  *  Copyright (C) 1994 Martin Schaller
       6             :  *
       7             :  *      2001 - Documented with DocBook
       8             :  *      - Brad Douglas <brad@neruo.com>
       9             :  *
      10             :  * This file is subject to the terms and conditions of the GNU General Public
      11             :  * License.  See the file COPYING in the main directory of this archive
      12             :  * for more details.
      13             :  *
      14             :  * Authors:
      15             :  *    Daniel Vetter <daniel.vetter@ffwll.ch>
      16             :  */
      17             : 
      18             : #include <linux/export.h>
      19             : #include <linux/fb.h>
      20             : #include <linux/string.h>
      21             : 
      22             : #include <video/cmdline.h>
      23             : 
      24             : /**
      25             :  * fb_get_options - get kernel boot parameters
      26             :  * @name:   framebuffer name as it would appear in
      27             :  *          the boot parameter line
      28             :  *          (video=<name>:<options>)
      29             :  * @option: the option will be stored here
      30             :  *
      31             :  * The caller owns the string returned in @option and is
      32             :  * responsible for releasing the memory.
      33             :  *
      34             :  * NOTE: Needed to maintain backwards compatibility
      35             :  */
      36           0 : int fb_get_options(const char *name, char **option)
      37             : {
      38           0 :         const char *options = NULL;
      39           0 :         bool is_of = false;
      40             :         bool enabled;
      41             : 
      42           0 :         if (name)
      43           0 :                 is_of = strncmp(name, "offb", 4);
      44             : 
      45           0 :         enabled = __video_get_options(name, &options, is_of);
      46             : 
      47           0 :         if (options) {
      48           0 :                 if (!strncmp(options, "off", 3))
      49           0 :                         enabled = false;
      50             :         }
      51             : 
      52           0 :         if (option) {
      53           0 :                 if (options)
      54           0 :                         *option = kstrdup(options, GFP_KERNEL);
      55             :                 else
      56           0 :                         *option = NULL;
      57             :         }
      58             : 
      59           0 :         return enabled ? 0 : 1; // 0 on success, 1 otherwise
      60             : }
      61             : EXPORT_SYMBOL(fb_get_options);