55 строки
1.4 KiB
C
55 строки
1.4 KiB
C
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/*
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* generic videomode helper
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*
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* Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
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*
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* This file is released under the GPLv2
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*/
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/of.h>
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#include <video/display_timing.h>
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#include <video/of_display_timing.h>
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#include <video/of_videomode.h>
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#include <video/videomode.h>
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/**
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* of_get_videomode - get the videomode #<index> from devicetree
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* @np - devicenode with the display_timings
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* @vm - set to return value
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* @index - index into list of display_timings
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* (Set this to OF_USE_NATIVE_MODE to use whatever mode is
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* specified as native mode in the DT.)
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*
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* DESCRIPTION:
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* Get a list of all display timings and put the one
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* specified by index into *vm. This function should only be used, if
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* only one videomode is to be retrieved. A driver that needs to work
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* with multiple/all videomodes should work with
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* of_get_display_timings instead.
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**/
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int of_get_videomode(struct device_node *np, struct videomode *vm,
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int index)
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{
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struct display_timings *disp;
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int ret;
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disp = of_get_display_timings(np);
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if (!disp) {
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pr_err("%s: no timings specified\n", of_node_full_name(np));
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return -EINVAL;
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}
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if (index == OF_USE_NATIVE_MODE)
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index = disp->native_mode;
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ret = videomode_from_timing(disp, vm, index);
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if (ret)
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return ret;
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display_timings_release(disp);
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_get_videomode);
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