/*
   * 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);

  
  	/**
  	 * read_edid() - Read information from EDID
  	 *
  	 * @dev:	Device to read from
  	 * @buf:	Buffer to read into
  	 * @buf_size:	Buffer size
  	 * @return number of bytes read, <=0 for error
  	 */
  	int (*read_edid)(struct udevice *dev, u8 *buf, int buf_size);

  };
  
  #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);

  /**
   * video_bridge_read_edid() - Read information from EDID
   *
   * @dev:	Device to read from
   * @buf:	Buffer to read into
   * @buf_size:	Buffer size
   * @return number of bytes read, <=0 for error
   */
  int video_bridge_read_edid(struct udevice *dev, u8 *buf, int buf_size);

  #endif