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
video_bridge_set_backlight(struct udevice * dev,int percent)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
video_bridge_attach(struct udevice * dev)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
video_bridge_check_attached(struct udevice * dev)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
video_bridge_read_edid(struct udevice * dev,u8 * buf,int buf_size)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
video_bridge_pre_probe(struct udevice * dev)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
video_bridge_set_active(struct udevice * dev,bool active)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 = 0;
110
111 debug("%s: %d\n", __func__, active);
112 if (uc_priv->sleep.dev) {
113 ret = dm_gpio_set_value(&uc_priv->sleep, !active);
114 if (ret)
115 return ret;
116 }
117
118 if (!active)
119 return 0;
120
121 if (uc_priv->reset.dev) {
122 ret = dm_gpio_set_value(&uc_priv->reset, true);
123 if (ret)
124 return ret;
125 udelay(10);
126 ret = dm_gpio_set_value(&uc_priv->reset, false);
127 }
128
129 return ret;
130 }
131
132 UCLASS_DRIVER(video_bridge) = {
133 .id = UCLASS_VIDEO_BRIDGE,
134 .name = "video_bridge",
135 .per_device_auto_alloc_size = sizeof(struct video_bridge_priv),
136 .pre_probe = video_bridge_pre_probe,
137 };
138