linux/drivers/video/of_videomode.c
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   1/*
   2 * generic videomode helper
   3 *
   4 * Copyright (c) 2012 Steffen Trumtrar <s.trumtrar@pengutronix.de>, Pengutronix
   5 *
   6 * This file is released under the GPLv2
   7 */
   8#include <linux/errno.h>
   9#include <linux/export.h>
  10#include <linux/of.h>
  11#include <video/display_timing.h>
  12#include <video/of_display_timing.h>
  13#include <video/of_videomode.h>
  14#include <video/videomode.h>
  15
  16/**
  17 * of_get_videomode - get the videomode #<index> from devicetree
  18 * @np - devicenode with the display_timings
  19 * @vm - set to return value
  20 * @index - index into list of display_timings
  21 *          (Set this to OF_USE_NATIVE_MODE to use whatever mode is
  22 *           specified as native mode in the DT.)
  23 *
  24 * DESCRIPTION:
  25 * Get a list of all display timings and put the one
  26 * specified by index into *vm. This function should only be used, if
  27 * only one videomode is to be retrieved. A driver that needs to work
  28 * with multiple/all videomodes should work with
  29 * of_get_display_timings instead.
  30 **/
  31int of_get_videomode(struct device_node *np, struct videomode *vm,
  32                     int index)
  33{
  34        struct display_timings *disp;
  35        int ret;
  36
  37        disp = of_get_display_timings(np);
  38        if (!disp) {
  39                pr_err("%s: no timings specified\n", of_node_full_name(np));
  40                return -EINVAL;
  41        }
  42
  43        if (index == OF_USE_NATIVE_MODE)
  44                index = disp->native_mode;
  45
  46        ret = videomode_from_timings(disp, vm, index);
  47        if (ret)
  48                return ret;
  49
  50        display_timings_release(disp);
  51
  52        return 0;
  53}
  54EXPORT_SYMBOL_GPL(of_get_videomode);
  55
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