801ab9e93c
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>
93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/*
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* Copyright (C) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __VIDEO_BRIDGE
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#define __VIDEO_BRIDGE
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#include <asm/gpio.h>
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/**
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* struct video_bridge_priv - uclass information for video bridges
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*
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* @sleep: GPIO to assert to power down the bridge
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* @reset: GPIO to assert to reset the bridge
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* @hotplug: Optional GPIO to check if bridge is connected
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*/
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struct video_bridge_priv {
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struct gpio_desc sleep;
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struct gpio_desc reset;
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struct gpio_desc hotplug;
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};
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/**
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* Operations for video bridges
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*/
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struct video_bridge_ops {
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/**
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* attach() - attach a video bridge
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*
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* @return 0 if OK, -ve on error
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*/
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int (*attach)(struct udevice *dev);
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/**
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* check_attached() - check if a bridge is correctly attached
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*
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* This method is optional - if not provided then the hotplug GPIO
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* will be checked instead.
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*
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* @dev: Device to check
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* @return 0 if attached, -EENOTCONN if not, or other -ve error
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*/
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int (*check_attached)(struct udevice *dev);
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/**
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* set_backlight() - Set the backlight brightness
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*
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* @dev: device to adjust
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* @percent: brightness percentage (0=off, 100=full brightness)
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* @return 0 if OK, -ve on error
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*/
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int (*set_backlight)(struct udevice *dev, int percent);
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};
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#define video_bridge_get_ops(dev) \
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((struct video_bridge_ops *)(dev)->driver->ops)
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/**
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* video_bridge_attach() - attach a video bridge
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*
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* @return 0 if OK, -ve on error
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*/
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int video_bridge_attach(struct udevice *dev);
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/**
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* video_bridge_set_backlight() - Set the backlight brightness
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*
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* @percent: brightness percentage (0=off, 100=full brightness)
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* @return 0 if OK, -ve on error
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*/
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int video_bridge_set_backlight(struct udevice *dev, int percent);
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/**
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* video_bridge_set_active() - take the bridge in/out of reset/powerdown
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*
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* @dev: Device to adjust
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* @active: true to power up and reset, false to power down
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*/
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int video_bridge_set_active(struct udevice *dev, bool active);
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/**
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* check_attached() - check if a bridge is correctly attached
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*
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* @dev: Device to check
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* @return 0 if attached, -EENOTCONN if not, or other -ve error
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*/
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int video_bridge_check_attached(struct udevice *dev);
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#endif
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