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authorSimon Glass <sjg@chromium.org>2015-07-02 18:16:08 -0600
committerSimon Glass <sjg@chromium.org>2015-08-05 21:06:13 -0600
commit801ab9e93c228b30bb526bb1b431e042d46ba2e8 (patch)
tree36662fffee086bb94a7346e41a3c8b65c18da7a7 /include/video_bridge.h
parent224d1ddcc5fa18d88e2c735778c39b8df61016ea (diff)
downloadu-boot-801ab9e93c228b30bb526bb1b431e042d46ba2e8.tar.gz
dm: video: Add support for video bridges
A video bridge typically converts video from one format to another, e.g. DisplayPort to LVDS. Add driver model support for these with a simple interface to control activation and backlight. The uclass supports GPIO control of power and reset lines. Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'include/video_bridge.h')
-rw-r--r--include/video_bridge.h92
1 files changed, 92 insertions, 0 deletions
diff --git a/include/video_bridge.h b/include/video_bridge.h
new file mode 100644
index 0000000000..c7b8681849
--- /dev/null
+++ b/include/video_bridge.h
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+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __VIDEO_BRIDGE
+#define __VIDEO_BRIDGE
+
+#include <asm/gpio.h>
+
+/**
+ * struct video_bridge_priv - uclass information for video bridges
+ *
+ * @sleep: GPIO to assert to power down the bridge
+ * @reset: GPIO to assert to reset the bridge
+ * @hotplug: Optional GPIO to check if bridge is connected
+ */
+struct video_bridge_priv {
+ struct gpio_desc sleep;
+ struct gpio_desc reset;
+ struct gpio_desc hotplug;
+};
+
+/**
+ * Operations for video bridges
+ */
+struct video_bridge_ops {
+ /**
+ * attach() - attach a video bridge
+ *
+ * @return 0 if OK, -ve on error
+ */
+ int (*attach)(struct udevice *dev);
+
+ /**
+ * check_attached() - check if a bridge is correctly attached
+ *
+ * This method is optional - if not provided then the hotplug GPIO
+ * will be checked instead.
+ *
+ * @dev: Device to check
+ * @return 0 if attached, -EENOTCONN if not, or other -ve error
+ */
+ int (*check_attached)(struct udevice *dev);
+
+ /**
+ * set_backlight() - Set the backlight brightness
+ *
+ * @dev: device to adjust
+ * @percent: brightness percentage (0=off, 100=full brightness)
+ * @return 0 if OK, -ve on error
+ */
+ int (*set_backlight)(struct udevice *dev, int percent);
+};
+
+#define video_bridge_get_ops(dev) \
+ ((struct video_bridge_ops *)(dev)->driver->ops)
+
+/**
+ * video_bridge_attach() - attach a video bridge
+ *
+ * @return 0 if OK, -ve on error
+ */
+int video_bridge_attach(struct udevice *dev);
+
+/**
+ * video_bridge_set_backlight() - Set the backlight brightness
+ *
+ * @percent: brightness percentage (0=off, 100=full brightness)
+ * @return 0 if OK, -ve on error
+ */
+int video_bridge_set_backlight(struct udevice *dev, int percent);
+
+/**
+ * video_bridge_set_active() - take the bridge in/out of reset/powerdown
+ *
+ * @dev: Device to adjust
+ * @active: true to power up and reset, false to power down
+ */
+int video_bridge_set_active(struct udevice *dev, bool active);
+
+/**
+ * check_attached() - check if a bridge is correctly attached
+ *
+ * @dev: Device to check
+ * @return 0 if attached, -EENOTCONN if not, or other -ve error
+ */
+int video_bridge_check_attached(struct udevice *dev);
+
+#endif