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aead40ea TR |
1 | /* |
2 | * Copyright (C) 2013, NVIDIA Corporation. All rights reserved. | |
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 | #include <drm/drm_panel.h> | |
29 | ||
30 | static DEFINE_MUTEX(panel_lock); | |
31 | static LIST_HEAD(panel_list); | |
32 | ||
33 | void drm_panel_init(struct drm_panel *panel) | |
34 | { | |
35 | INIT_LIST_HEAD(&panel->list); | |
36 | } | |
37 | EXPORT_SYMBOL(drm_panel_init); | |
38 | ||
39 | int drm_panel_add(struct drm_panel *panel) | |
40 | { | |
41 | mutex_lock(&panel_lock); | |
42 | list_add_tail(&panel->list, &panel_list); | |
43 | mutex_unlock(&panel_lock); | |
44 | ||
45 | return 0; | |
46 | } | |
47 | EXPORT_SYMBOL(drm_panel_add); | |
48 | ||
49 | void drm_panel_remove(struct drm_panel *panel) | |
50 | { | |
51 | mutex_lock(&panel_lock); | |
52 | list_del_init(&panel->list); | |
53 | mutex_unlock(&panel_lock); | |
54 | } | |
55 | EXPORT_SYMBOL(drm_panel_remove); | |
56 | ||
57 | int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector) | |
58 | { | |
59 | if (panel->connector) | |
60 | return -EBUSY; | |
61 | ||
62 | panel->connector = connector; | |
63 | panel->drm = connector->dev; | |
64 | ||
65 | return 0; | |
66 | } | |
67 | EXPORT_SYMBOL(drm_panel_attach); | |
68 | ||
69 | int drm_panel_detach(struct drm_panel *panel) | |
70 | { | |
71 | panel->connector = NULL; | |
72 | panel->drm = NULL; | |
73 | ||
74 | return 0; | |
75 | } | |
76 | EXPORT_SYMBOL(drm_panel_detach); | |
77 | ||
78 | #ifdef CONFIG_OF | |
79 | struct drm_panel *of_drm_find_panel(struct device_node *np) | |
80 | { | |
81 | struct drm_panel *panel; | |
82 | ||
83 | mutex_lock(&panel_lock); | |
84 | ||
85 | list_for_each_entry(panel, &panel_list, list) { | |
86 | if (panel->dev->of_node == np) { | |
87 | mutex_unlock(&panel_lock); | |
88 | return panel; | |
89 | } | |
90 | } | |
91 | ||
92 | mutex_unlock(&panel_lock); | |
93 | return NULL; | |
94 | } | |
95 | EXPORT_SYMBOL(of_drm_find_panel); | |
96 | #endif | |
97 | ||
98 | MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); | |
99 | MODULE_DESCRIPTION("DRM panel infrastructure"); | |
100 | MODULE_LICENSE("GPL and additional rights"); |