1 /*
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 #include <common.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <edid.h>
12 #include <video_bridge.h>
13
video_bridge_set_backlight(struct udevice * dev,int percent)14 int video_bridge_set_backlight(struct udevice *dev, int percent)
15 {
16 struct video_bridge_ops *ops = video_bridge_get_ops(dev);
17
18 if (!ops->set_backlight)
19 return -ENOSYS;
20
21 return ops->set_backlight(dev, percent);
22 }
23
video_bridge_attach(struct udevice * dev)24 int video_bridge_attach(struct udevice *dev)
25 {
26 struct video_bridge_ops *ops = video_bridge_get_ops(dev);
27
28 if (!ops->attach)
29 return -ENOSYS;
30
31 return ops->attach(dev);
32 }
33
video_bridge_check_attached(struct udevice * dev)34 int video_bridge_check_attached(struct udevice *dev)
35 {
36 struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
37 struct video_bridge_ops *ops = video_bridge_get_ops(dev);
38 int ret;
39
40 if (!ops->check_attached) {
41 ret = dm_gpio_get_value(&uc_priv->hotplug);
42
43 return ret > 0 ? 0 : ret == 0 ? -ENOTCONN : ret;
44 }
45
46 return ops->check_attached(dev);
47 }
48
video_bridge_read_edid(struct udevice * dev,u8 * buf,int buf_size)49 int video_bridge_read_edid(struct udevice *dev, u8 *buf, int buf_size)
50 {
51 struct video_bridge_ops *ops = video_bridge_get_ops(dev);
52
53 if (!ops || !ops->read_edid)
54 return -ENOSYS;
55 return ops->read_edid(dev, buf, buf_size);
56 }
57
video_bridge_get_timing(struct udevice * dev)58 int video_bridge_get_timing(struct udevice *dev)
59 {
60 struct video_bridge_ops *ops = video_bridge_get_ops(dev);
61
62 if (!ops || !ops->get_timing)
63 return -ENOSYS;
64 return ops->get_timing(dev);
65 }
66
video_bridge_pre_probe(struct udevice * dev)67 static int video_bridge_pre_probe(struct udevice *dev)
68 {
69 struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
70 int ret;
71
72 debug("%s\n", __func__);
73 ret = gpio_request_by_name(dev, "sleep-gpios", 0,
74 &uc_priv->sleep, GPIOD_IS_OUT);
75 if (ret) {
76 debug("%s: Could not decode sleep-gpios (%d)\n", __func__, ret);
77 if (ret != -ENOENT)
78 return ret;
79 }
80 /*
81 * Drop this for now as we do not have driver model pinctrl support
82 *
83 * ret = dm_gpio_set_pull(&uc_priv->sleep, GPIO_PULL_NONE);
84 * if (ret) {
85 * debug("%s: Could not set sleep pull value\n", __func__);
86 * return ret;
87 * }
88 */
89 ret = gpio_request_by_name(dev, "reset-gpios", 0, &uc_priv->reset,
90 GPIOD_IS_OUT);
91 if (ret) {
92 debug("%s: Could not decode reset-gpios (%d)\n", __func__, ret);
93 if (ret != -ENOENT)
94 return ret;
95 }
96 /*
97 * Drop this for now as we do not have driver model pinctrl support
98 *
99 * ret = dm_gpio_set_pull(&uc_priv->reset, GPIO_PULL_NONE);
100 * if (ret) {
101 * debug("%s: Could not set reset pull value\n", __func__);
102 * return ret;
103 * }
104 */
105 ret = gpio_request_by_name(dev, "hotplug-gpios", 0, &uc_priv->hotplug,
106 GPIOD_IS_IN);
107 if (ret) {
108 debug("%s: Could not decode hotplug (%d)\n", __func__, ret);
109 if (ret != -ENOENT)
110 return ret;
111 }
112
113 return 0;
114 }
115
video_bridge_set_active(struct udevice * dev,bool active)116 int video_bridge_set_active(struct udevice *dev, bool active)
117 {
118 struct video_bridge_priv *uc_priv = dev_get_uclass_priv(dev);
119 int ret = 0;
120
121 debug("%s: %d\n", __func__, active);
122 if (uc_priv->sleep.dev) {
123 ret = dm_gpio_set_value(&uc_priv->sleep, !active);
124 if (ret)
125 return ret;
126 }
127
128 if (!active)
129 return 0;
130
131 if (uc_priv->reset.dev) {
132 ret = dm_gpio_set_value(&uc_priv->reset, true);
133 if (ret)
134 return ret;
135 udelay(10);
136 ret = dm_gpio_set_value(&uc_priv->reset, false);
137 }
138
139 return ret;
140 }
141
142 UCLASS_DRIVER(video_bridge) = {
143 .id = UCLASS_VIDEO_BRIDGE,
144 .name = "video_bridge",
145 .per_device_auto_alloc_size = sizeof(struct video_bridge_priv),
146 .pre_probe = video_bridge_pre_probe,
147 };
148