diff options
Diffstat (limited to 'drivers/gpu/drm/drm_bridge.c')
-rw-r--r-- | drivers/gpu/drm/drm_bridge.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c new file mode 100644 index 000000000000..d1187e571c6d --- /dev/null +++ b/drivers/gpu/drm/drm_bridge.c | |||
@@ -0,0 +1,91 @@ | |||
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"); | ||