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

[Steffen Trumtrar]

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 at 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 at 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 at 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