Add helper functions to convert from display timings to a generic videomode structure. This videomode can then be converted to the corresponding subsystem mode representation (e.g. fb_videomode).
Signed-off-by: Steffen Trumtrar s.trumtrar@pengutronix.de --- drivers/video/Kconfig | 6 ++++++ drivers/video/Makefile | 1 + drivers/video/videomode.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/videomode.h | 36 ++++++++++++++++++++++++++++++++++++ 4 files changed, 87 insertions(+) create mode 100644 drivers/video/videomode.c create mode 100644 include/linux/videomode.h
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 1421fc8..45dd393 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -38,6 +38,12 @@ config DISPLAY_TIMING help Say Y here, to use the display timing helpers.
+config VIDEOMODE + bool "Enable videomode helpers" + help + Say Y here, to use the generic videomode helpers. This allows + converting from display timings to fb_videomode and drm_display_mode + menuconfig FB tristate "Support for frame buffer devices" ---help--- diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 552c045..fc30439 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -168,3 +168,4 @@ obj-$(CONFIG_FB_VIRTUAL) += vfb.o #video output switch sysfs driver obj-$(CONFIG_VIDEO_OUTPUT_CONTROL) += output.o obj-$(CONFIG_DISPLAY_TIMING) += display_timing.o +obj-$(CONFIG_VIDEOMODE) += videomode.o diff --git a/drivers/video/videomode.c b/drivers/video/videomode.c new file mode 100644 index 0000000..a9fe010 --- /dev/null +++ b/drivers/video/videomode.c @@ -0,0 +1,44 @@ +/* + * generic display timing functions + * + * Copyright (c) 2012 Steffen Trumtrar s.trumtrar@pengutronix.de, Pengutronix + * + * This file is released under the GPLv2 + */ + +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/errno.h> +#include <linux/display_timing.h> +#include <linux/videomode.h> + +int videomode_from_timing(struct display_timings *disp, struct videomode *vm, + int index) +{ + struct display_timing *dt = NULL; + + dt = display_timings_get(disp, index); + if (!dt) { + pr_err("%s: no signal timings found\n", __func__); + return -EINVAL; + } + + vm->pixelclock = display_timing_get_value(&dt->pixelclock, 0); + vm->hactive = display_timing_get_value(&dt->hactive, 0); + vm->hfront_porch = display_timing_get_value(&dt->hfront_porch, 0); + vm->hback_porch = display_timing_get_value(&dt->hback_porch, 0); + vm->hsync_len = display_timing_get_value(&dt->hsync_len, 0); + + vm->vactive = display_timing_get_value(&dt->vactive, 0); + vm->vfront_porch = display_timing_get_value(&dt->vfront_porch, 0); + vm->vback_porch = display_timing_get_value(&dt->vback_porch, 0); + vm->vsync_len = display_timing_get_value(&dt->vsync_len, 0); + + vm->vah = dt->vsync_pol_active; + vm->hah = dt->hsync_pol_active; + vm->interlaced = dt->interlaced; + vm->doublescan = dt->doublescan; + + return 0; +} +EXPORT_SYMBOL_GPL(videomode_from_timing); diff --git a/include/linux/videomode.h b/include/linux/videomode.h new file mode 100644 index 0000000..f932147 --- /dev/null +++ b/include/linux/videomode.h @@ -0,0 +1,36 @@ +/* + * Copyright 2012 Steffen Trumtrar s.trumtrar@pengutronix.de + * + * generic videomode description + * + * This file is released under the GPLv2 + */ + +#ifndef __LINUX_VIDEOMODE_H +#define __LINUX_VIDEOMODE_H + +#include <linux/display_timing.h> + +struct videomode { + u32 pixelclock; + u32 refreshrate; + + u32 hactive; + u32 hfront_porch; + u32 hback_porch; + u32 hsync_len; + + u32 vactive; + u32 vfront_porch; + u32 vback_porch; + u32 vsync_len; + + u32 hah; + u32 vah; + bool interlaced; + bool doublescan; +}; + +int videomode_from_timing(struct display_timings *disp, struct videomode *vm, + int index); +#endif