| Steffen Trumtrar | cc3f414 | 2012-10-04 15:32:52 +0200 | [diff] [blame] | 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 | **/ |
| 31 | int 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 | } |
| 54 | EXPORT_SYMBOL_GPL(of_get_videomode); |