| 1 | /* |
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| 2 | * linux/drivers/video/fb_cmdline.c |
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| 3 | * |
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| 4 | * Copyright (C) 2014 Intel Corp |
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| 5 | * Copyright (C) 1994 Martin Schaller |
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| 6 | * |
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| 7 | * 2001 - Documented with DocBook |
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| 8 | * - Brad Douglas <brad@neruo.com> |
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| 9 | * |
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| 10 | * This file is subject to the terms and conditions of the GNU General Public |
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| 11 | * License. See the file COPYING in the main directory of this archive |
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| 12 | * for more details. |
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| 13 | * |
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| 14 | * Authors: |
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| 15 | * Daniel Vetter <daniel.vetter@ffwll.ch> |
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| 16 | */ |
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| 17 | |
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| 18 | #include <linux/export.h> |
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| 19 | #include <linux/fb.h> |
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| 20 | #include <linux/string.h> |
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| 21 | |
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| 22 | #include <video/cmdline.h> |
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| 23 | |
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| 24 | /** |
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| 25 | * fb_get_options - get kernel boot parameters |
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| 26 | * @name: framebuffer name as it would appear in |
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| 27 | * the boot parameter line |
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| 28 | * (video=<name>:<options>) |
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| 29 | * @option: the option will be stored here |
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| 30 | * |
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| 31 | * The caller owns the string returned in @option and is |
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| 32 | * responsible for releasing the memory. |
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| 33 | * |
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| 34 | * NOTE: Needed to maintain backwards compatibility |
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| 35 | */ |
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| 36 | int fb_get_options(const char *name, char **option) |
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| 37 | { |
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| 38 | const char *options = NULL; |
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| 39 | bool is_of = false; |
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| 40 | bool enabled; |
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| 41 | |
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| 42 | if (name) |
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| 43 | is_of = strncmp(name, "offb" , 4); |
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| 44 | |
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| 45 | enabled = __video_get_options(name, option: &options, is_of); |
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| 46 | |
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| 47 | if (options) { |
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| 48 | if (!strncmp(options, "off" , 3)) |
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| 49 | enabled = false; |
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| 50 | } |
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| 51 | |
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| 52 | if (option) { |
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| 53 | if (options) |
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| 54 | *option = kstrdup(s: options, GFP_KERNEL); |
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| 55 | else |
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| 56 | *option = NULL; |
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| 57 | } |
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| 58 | |
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| 59 | return enabled ? 0 : 1; // 0 on success, 1 otherwise |
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| 60 | } |
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| 61 | EXPORT_SYMBOL(fb_get_options); |
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| 62 | |
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