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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 | ||
31 | static DEFINE_MUTEX(bridge_lock); | |
32 | static LIST_HEAD(bridge_list); | |
33 | ||
34 | int 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 | } | |
42 | EXPORT_SYMBOL(drm_bridge_add); | |
43 | ||
44 | void 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 | } | |
50 | EXPORT_SYMBOL(drm_bridge_remove); | |
51 | ||
52 | extern int 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 | } | |
67 | EXPORT_SYMBOL(drm_bridge_attach); | |
68 | ||
69 | #ifdef CONFIG_OF | |
70 | struct 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 | } | |
86 | EXPORT_SYMBOL(of_drm_find_bridge); | |
87 | #endif | |
88 | ||
89 | MODULE_AUTHOR("Ajay Kumar <ajaykumar.rs@samsung.com>"); | |
90 | MODULE_DESCRIPTION("DRM bridge infrastructure"); | |
91 | MODULE_LICENSE("GPL and additional rights"); |