[PATCH v7 4/8] video: add videomode helpers

Steffen Trumtrar
2012-10-31T09:29:11Z

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
--
1.7.10.4