1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <drm/drmP.h>
#include <drm/drm_bridge.h>
#include <drm/drm_panel.h>
#include <linux/gpio/consumer.h>
#include <linux/of_graph.h>
struct lvds_encoder {
struct drm_bridge bridge;
struct drm_bridge *panel_bridge;
struct gpio_desc *powerdown_gpio;
};
static int lvds_encoder_attach(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds_encoder = container_of(bridge,
struct lvds_encoder,
bridge);
return drm_bridge_attach(bridge->encoder, lvds_encoder->panel_bridge,
bridge);
}
static void lvds_encoder_enable(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds_encoder = container_of(bridge,
struct lvds_encoder,
bridge);
if (lvds_encoder->powerdown_gpio)
gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 0);
}
static void lvds_encoder_disable(struct drm_bridge *bridge)
{
struct lvds_encoder *lvds_encoder = container_of(bridge,
struct lvds_encoder,
bridge);
if (lvds_encoder->powerdown_gpio)
gpiod_set_value_cansleep(lvds_encoder->powerdown_gpio, 1);
}
static struct drm_bridge_funcs funcs = {
.attach = lvds_encoder_attach,
.enable = lvds_encoder_enable,
.disable = lvds_encoder_disable,
};
static int lvds_encoder_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *port;
struct device_node *endpoint;
struct device_node *panel_node;
struct drm_panel *panel;
struct lvds_encoder *lvds_encoder;
lvds_encoder = devm_kzalloc(dev, sizeof(*lvds_encoder), GFP_KERNEL);
if (!lvds_encoder)
return -ENOMEM;
lvds_encoder->powerdown_gpio = devm_gpiod_get_optional(dev, "powerdown",
GPIOD_OUT_HIGH);
if (IS_ERR(lvds_encoder->powerdown_gpio)) {
int err = PTR_ERR(lvds_encoder->powerdown_gpio);
if (err != -EPROBE_DEFER)
dev_err(dev, "powerdown GPIO failure: %d\n", err);
return err;
}
/* Locate the panel DT node. */
port = of_graph_get_port_by_id(dev->of_node, 1);
if (!port) {
dev_dbg(dev, "port 1 not found\n");
return -ENXIO;
}
endpoint = of_get_child_by_name(port, "endpoint");
of_node_put(port);
if (!endpoint) {
dev_dbg(dev, "no endpoint for port 1\n");
return -ENXIO;
}
panel_node = of_graph_get_remote_port_parent(endpoint);
of_node_put(endpoint);
if (!panel_node) {
dev_dbg(dev, "no remote endpoint for port 1\n");
return -ENXIO;
}
panel = of_drm_find_panel(panel_node);
of_node_put(panel_node);
if (IS_ERR(panel)) {
dev_dbg(dev, "panel not found, deferring probe\n");
return PTR_ERR(panel);
}
lvds_encoder->panel_bridge =
devm_drm_panel_bridge_add(dev, panel, DRM_MODE_CONNECTOR_LVDS);
if (IS_ERR(lvds_encoder->panel_bridge))
return PTR_ERR(lvds_encoder->panel_bridge);
/* The panel_bridge bridge is attached to the panel's of_node,
* but we need a bridge attached to our of_node for our user
* to look up.
*/
lvds_encoder->bridge.of_node = dev->of_node;
lvds_encoder->bridge.funcs = &funcs;
drm_bridge_add(&lvds_encoder->bridge);
platform_set_drvdata(pdev, lvds_encoder);
return 0;
}
static int lvds_encoder_remove(struct platform_device *pdev)
{
struct lvds_encoder *lvds_encoder = platform_get_drvdata(pdev);
drm_bridge_remove(&lvds_encoder->bridge);
return 0;
}
static const struct of_device_id lvds_encoder_match[] = {
{ .compatible = "lvds-encoder" },
{ .compatible = "thine,thc63lvdm83d" },
{},
};
MODULE_DEVICE_TABLE(of, lvds_encoder_match);
static struct platform_driver lvds_encoder_driver = {
.probe = lvds_encoder_probe,
.remove = lvds_encoder_remove,
.driver = {
.name = "lvds-encoder",
.of_match_table = lvds_encoder_match,
},
};
module_platform_driver(lvds_encoder_driver);
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_DESCRIPTION("Transparent parallel to LVDS encoder");
MODULE_LICENSE("GPL");
|
