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Simon Glass801ab9e2015-07-02 18:16:08 -06001/*
2 * Copyright (C) 2015 Google, Inc
3 * Written by Simon Glass <sjg@chromium.org>
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#ifndef __VIDEO_BRIDGE
9#define __VIDEO_BRIDGE
10
11#include <asm/gpio.h>
12
13/**
14 * struct video_bridge_priv - uclass information for video bridges
15 *
16 * @sleep: GPIO to assert to power down the bridge
17 * @reset: GPIO to assert to reset the bridge
18 * @hotplug: Optional GPIO to check if bridge is connected
19 */
20struct video_bridge_priv {
21 struct gpio_desc sleep;
22 struct gpio_desc reset;
23 struct gpio_desc hotplug;
24};
25
26/**
27 * Operations for video bridges
28 */
29struct video_bridge_ops {
30 /**
31 * attach() - attach a video bridge
32 *
33 * @return 0 if OK, -ve on error
34 */
35 int (*attach)(struct udevice *dev);
36
37 /**
38 * check_attached() - check if a bridge is correctly attached
39 *
40 * This method is optional - if not provided then the hotplug GPIO
41 * will be checked instead.
42 *
43 * @dev: Device to check
44 * @return 0 if attached, -EENOTCONN if not, or other -ve error
45 */
46 int (*check_attached)(struct udevice *dev);
47
48 /**
49 * set_backlight() - Set the backlight brightness
50 *
51 * @dev: device to adjust
52 * @percent: brightness percentage (0=off, 100=full brightness)
53 * @return 0 if OK, -ve on error
54 */
55 int (*set_backlight)(struct udevice *dev, int percent);
56};
57
58#define video_bridge_get_ops(dev) \
59 ((struct video_bridge_ops *)(dev)->driver->ops)
60
61/**
62 * video_bridge_attach() - attach a video bridge
63 *
64 * @return 0 if OK, -ve on error
65 */
66int video_bridge_attach(struct udevice *dev);
67
68/**
69 * video_bridge_set_backlight() - Set the backlight brightness
70 *
71 * @percent: brightness percentage (0=off, 100=full brightness)
72 * @return 0 if OK, -ve on error
73 */
74int video_bridge_set_backlight(struct udevice *dev, int percent);
75
76/**
77 * video_bridge_set_active() - take the bridge in/out of reset/powerdown
78 *
79 * @dev: Device to adjust
80 * @active: true to power up and reset, false to power down
81 */
82int video_bridge_set_active(struct udevice *dev, bool active);
83
84/**
85 * check_attached() - check if a bridge is correctly attached
86 *
87 * @dev: Device to check
88 * @return 0 if attached, -EENOTCONN if not, or other -ve error
89 */
90int video_bridge_check_attached(struct udevice *dev);
91
92#endif