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Steffen Trumtrarcc3f4142012-10-04 15:32:52 +02001/*
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_timing(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);