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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 | ||
0c08754b | 27 | #include <drm/drm_device.h> |
aead40ea TR |
28 | #include <drm/drm_crtc.h> |
29 | #include <drm/drm_panel.h> | |
30 | ||
31 | static DEFINE_MUTEX(panel_lock); | |
32 | static LIST_HEAD(panel_list); | |
33 | ||
83127f67 TR |
34 | /** |
35 | * DOC: drm panel | |
36 | * | |
37 | * The DRM panel helpers allow drivers to register panel objects with a | |
38 | * central registry and provide functions to retrieve those panels in display | |
39 | * drivers. | |
40 | */ | |
41 | ||
42 | /** | |
43 | * drm_panel_init - initialize a panel | |
44 | * @panel: DRM panel | |
45 | * | |
46 | * Sets up internal fields of the panel so that it can subsequently be added | |
47 | * to the registry. | |
48 | */ | |
aead40ea TR |
49 | void drm_panel_init(struct drm_panel *panel) |
50 | { | |
51 | INIT_LIST_HEAD(&panel->list); | |
52 | } | |
53 | EXPORT_SYMBOL(drm_panel_init); | |
54 | ||
83127f67 TR |
55 | /** |
56 | * drm_panel_add - add a panel to the global registry | |
57 | * @panel: panel to add | |
58 | * | |
59 | * Add a panel to the global registry so that it can be looked up by display | |
60 | * drivers. | |
61 | * | |
62 | * Return: 0 on success or a negative error code on failure. | |
63 | */ | |
aead40ea TR |
64 | int drm_panel_add(struct drm_panel *panel) |
65 | { | |
66 | mutex_lock(&panel_lock); | |
67 | list_add_tail(&panel->list, &panel_list); | |
68 | mutex_unlock(&panel_lock); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | EXPORT_SYMBOL(drm_panel_add); | |
73 | ||
83127f67 TR |
74 | /** |
75 | * drm_panel_remove - remove a panel from the global registry | |
76 | * @panel: DRM panel | |
77 | * | |
78 | * Removes a panel from the global registry. | |
79 | */ | |
aead40ea TR |
80 | void drm_panel_remove(struct drm_panel *panel) |
81 | { | |
82 | mutex_lock(&panel_lock); | |
83 | list_del_init(&panel->list); | |
84 | mutex_unlock(&panel_lock); | |
85 | } | |
86 | EXPORT_SYMBOL(drm_panel_remove); | |
87 | ||
83127f67 TR |
88 | /** |
89 | * drm_panel_attach - attach a panel to a connector | |
90 | * @panel: DRM panel | |
91 | * @connector: DRM connector | |
92 | * | |
93 | * After obtaining a pointer to a DRM panel a display driver calls this | |
94 | * function to attach a panel to a connector. | |
95 | * | |
96 | * An error is returned if the panel is already attached to another connector. | |
97 | * | |
38992c57 JS |
98 | * When unloading, the driver should detach from the panel by calling |
99 | * drm_panel_detach(). | |
100 | * | |
83127f67 TR |
101 | * Return: 0 on success or a negative error code on failure. |
102 | */ | |
aead40ea TR |
103 | int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector) |
104 | { | |
105 | if (panel->connector) | |
106 | return -EBUSY; | |
107 | ||
0c08754b JS |
108 | panel->link = device_link_add(connector->dev->dev, panel->dev, 0); |
109 | if (!panel->link) { | |
110 | dev_err(panel->dev, "failed to link panel to %s\n", | |
111 | dev_name(connector->dev->dev)); | |
112 | return -EINVAL; | |
113 | } | |
114 | ||
aead40ea TR |
115 | panel->connector = connector; |
116 | panel->drm = connector->dev; | |
117 | ||
118 | return 0; | |
119 | } | |
120 | EXPORT_SYMBOL(drm_panel_attach); | |
121 | ||
83127f67 TR |
122 | /** |
123 | * drm_panel_detach - detach a panel from a connector | |
124 | * @panel: DRM panel | |
125 | * | |
126 | * Detaches a panel from the connector it is attached to. If a panel is not | |
127 | * attached to any connector this is effectively a no-op. | |
128 | * | |
38992c57 JS |
129 | * This function should not be called by the panel device itself. It |
130 | * is only for the drm device that called drm_panel_attach(). | |
131 | * | |
83127f67 TR |
132 | * Return: 0 on success or a negative error code on failure. |
133 | */ | |
aead40ea TR |
134 | int drm_panel_detach(struct drm_panel *panel) |
135 | { | |
0c08754b JS |
136 | device_link_del(panel->link); |
137 | ||
aead40ea TR |
138 | panel->connector = NULL; |
139 | panel->drm = NULL; | |
140 | ||
141 | return 0; | |
142 | } | |
143 | EXPORT_SYMBOL(drm_panel_detach); | |
144 | ||
145 | #ifdef CONFIG_OF | |
83127f67 TR |
146 | /** |
147 | * of_drm_find_panel - look up a panel using a device tree node | |
148 | * @np: device tree node of the panel | |
149 | * | |
150 | * Searches the set of registered panels for one that matches the given device | |
151 | * tree node. If a matching panel is found, return a pointer to it. | |
152 | * | |
153 | * Return: A pointer to the panel registered for the specified device tree | |
154 | * node or NULL if no panel matching the device tree node can be found. | |
155 | */ | |
327bc443 | 156 | struct drm_panel *of_drm_find_panel(const struct device_node *np) |
aead40ea TR |
157 | { |
158 | struct drm_panel *panel; | |
159 | ||
160 | mutex_lock(&panel_lock); | |
161 | ||
162 | list_for_each_entry(panel, &panel_list, list) { | |
163 | if (panel->dev->of_node == np) { | |
164 | mutex_unlock(&panel_lock); | |
165 | return panel; | |
166 | } | |
167 | } | |
168 | ||
169 | mutex_unlock(&panel_lock); | |
170 | return NULL; | |
171 | } | |
172 | EXPORT_SYMBOL(of_drm_find_panel); | |
173 | #endif | |
174 | ||
175 | MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); | |
176 | MODULE_DESCRIPTION("DRM panel infrastructure"); | |
177 | MODULE_LICENSE("GPL and additional rights"); |