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
30static DEFINE_MUTEX(panel_lock);
31static LIST_HEAD(panel_list);
32
33void drm_panel_init(struct drm_panel *panel)
34{
35	INIT_LIST_HEAD(&panel->list);
36}
37EXPORT_SYMBOL(drm_panel_init);
38
39int 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}
47EXPORT_SYMBOL(drm_panel_add);
48
49void 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}
55EXPORT_SYMBOL(drm_panel_remove);
56
57int 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}
67EXPORT_SYMBOL(drm_panel_attach);
68
69int drm_panel_detach(struct drm_panel *panel)
70{
71	panel->connector = NULL;
72	panel->drm = NULL;
73
74	return 0;
75}
76EXPORT_SYMBOL(drm_panel_detach);
77
78#ifdef CONFIG_OF
79struct 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}
95EXPORT_SYMBOL(of_drm_find_panel);
96#endif
97
98MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
99MODULE_DESCRIPTION("DRM panel infrastructure");
100MODULE_LICENSE("GPL and additional rights");
101