1/*
2 * Copyright (c) 2014 Samsung Electronics Co., Ltd
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sub license,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the
12 * next paragraph) shall be included in all copies or substantial portions
13 * of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 */
23
24#include <linux/err.h>
25#include <linux/module.h>
26
27#include <drm/drm_crtc.h>
28
29#include "drm/drmP.h"
30
31static DEFINE_MUTEX(bridge_lock);
32static LIST_HEAD(bridge_list);
33
34int drm_bridge_add(struct drm_bridge *bridge)
35{
36	mutex_lock(&bridge_lock);
37	list_add_tail(&bridge->list, &bridge_list);
38	mutex_unlock(&bridge_lock);
39
40	return 0;
41}
42EXPORT_SYMBOL(drm_bridge_add);
43
44void drm_bridge_remove(struct drm_bridge *bridge)
45{
46	mutex_lock(&bridge_lock);
47	list_del_init(&bridge->list);
48	mutex_unlock(&bridge_lock);
49}
50EXPORT_SYMBOL(drm_bridge_remove);
51
52int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge)
53{
54	if (!dev || !bridge)
55		return -EINVAL;
56
57	if (bridge->dev)
58		return -EBUSY;
59
60	bridge->dev = dev;
61
62	if (bridge->funcs->attach)
63		return bridge->funcs->attach(bridge);
64
65	return 0;
66}
67EXPORT_SYMBOL(drm_bridge_attach);
68
69#ifdef CONFIG_OF
70struct drm_bridge *of_drm_find_bridge(struct device_node *np)
71{
72	struct drm_bridge *bridge;
73
74	mutex_lock(&bridge_lock);
75
76	list_for_each_entry(bridge, &bridge_list, list) {
77		if (bridge->of_node == np) {
78			mutex_unlock(&bridge_lock);
79			return bridge;
80		}
81	}
82
83	mutex_unlock(&bridge_lock);
84	return NULL;
85}
86EXPORT_SYMBOL(of_drm_find_bridge);
87#endif
88
89MODULE_AUTHOR("Ajay Kumar <ajaykumar.rs@samsung.com>");
90MODULE_DESCRIPTION("DRM bridge infrastructure");
91MODULE_LICENSE("GPL and additional rights");
92