1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2015 Google, Inc
4  * Written by Simon Glass <sjg@chromium.org>
5  */
6 
7 #include <common.h>
8 #include <dm.h>
9 #include <errno.h>
10 #include <edid.h>
11 #include <video_bridge.h>
12 
13 int video_bridge_set_backlight(struct udevice *dev, int percent)
14 {
15 	struct video_bridge_ops *ops = video_bridge_get_ops(dev);
16 
17 	if (!ops->set_backlight)
18 		return -ENOSYS;
19 
20 	return ops->set_backlight(dev, percent);
21 }
22 
23 int video_bridge_attach(struct udevice *dev)
24 {
25 	struct video_bridge_ops *ops = video_bridge_get_ops(dev);
26 
27 	if (!ops->attach)
28 		return -ENOSYS;
29 
30 	return ops->attach(dev);
31 }
32 
33 int video_bridge_check_attached(struct udevice *dev)
34 {
35 	struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
36 	struct video_bridge_ops *ops = video_bridge_get_ops(dev);
37 	int ret;
38 
39 	if (!ops->check_attached) {
40 		ret = dm_gpio_get_value(&uc_priv->hotplug);
41 
42 		return ret > 0 ? 0 : ret == 0 ? -ENOTCONN : ret;
43 	}
44 
45 	return ops->check_attached(dev);
46 }
47 
48 int video_bridge_read_edid(struct udevice *dev, u8 *buf, int buf_size)
49 {
50 	struct video_bridge_ops *ops = video_bridge_get_ops(dev);
51 
52 	if (!ops || !ops->read_edid)
53 		return -ENOSYS;
54 	return ops->read_edid(dev, buf, buf_size);
55 }
56 
57 static int video_bridge_pre_probe(struct udevice *dev)
58 {
59 	struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
60 	int ret;
61 
62 	debug("%s\n", __func__);
63 	ret = gpio_request_by_name(dev, "sleep-gpios", 0,
64 				   &uc_priv->sleep, GPIOD_IS_OUT);
65 	if (ret) {
66 		debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret);
67 		if (ret != -ENOENT)
68 			return ret;
69 	}
70 	/*
71 	 * Drop this for now as we do not have driver model pinctrl support
72 	 *
73 	 * ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE);
74 	 * if (ret) {
75 	 *	debug("%s: Could not set sleep pull value\n", __func__);
76 	 *	return ret;
77 	 * }
78 	 */
79 	ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset,
80 				   GPIOD_IS_OUT);
81 	if (ret) {
82 		debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret);
83 		if (ret != -ENOENT)
84 			return ret;
85 	}
86 	/*
87 	 * Drop this for now as we do not have driver model pinctrl support
88 	 *
89 	 * ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE);
90 	 * if (ret) {
91 	 *	debug("%s: Could not set reset pull value\n", __func__);
92 	 *	return ret;
93 	 * }
94 	 */
95 	ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug,
96 				   GPIOD_IS_IN);
97 	if (ret) {
98 		debug("%s: Could not decode hotplug (%d)\n", __func__, ret);
99 		if (ret != -ENOENT)
100 			return ret;
101 	}
102 
103 	return 0;
104 }
105 
106 int video_bridge_set_active(struct udevice *dev, bool active)
107 {
108 	struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
109 	int ret;
110 
111 	debug("%s: %d\n", __func__, active);
112 	ret = dm_gpio_set_value(&uc_priv->sleep, !active);
113 	if (ret)
114 		return ret;
115 	if (active) {
116 		ret = dm_gpio_set_value(&uc_priv->reset, true);
117 		if (ret)
118 			return ret;
119 		udelay(10);
120 		ret = dm_gpio_set_value(&uc_priv->reset, false);
121 	}
122 
123 	return ret;
124 }
125 
126 UCLASS_DRIVER(video_bridge) = {
127 	.id		= UCLASS_VIDEO_BRIDGE,
128 	.name		= "video_bridge",
129 	.per_device_auto_alloc_size	= sizeof(struct video_bridge_priv),
130 	.pre_probe	= video_bridge_pre_probe,
131 };
132