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
drm_panel_init(struct drm_panel * panel)33 void drm_panel_init(struct drm_panel *panel)
34 {
35 INIT_LIST_HEAD(&panel->list);
36 }
37 EXPORT_SYMBOL(drm_panel_init);
38
drm_panel_add(struct drm_panel * panel)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
drm_panel_remove(struct drm_panel * panel)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
drm_panel_attach(struct drm_panel * panel,struct drm_connector * connector)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
drm_panel_detach(struct drm_panel * panel)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
of_drm_find_panel(struct device_node * np)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");
101