2 * Copyright (C) 2013, NVIDIA Corporation. All rights reserved.
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:
11 * The above copyright notice and this permission notice (including the
12 * next paragraph) shall be included in all copies or substantial portions
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
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20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
24 #ifndef __DRM_PANEL_H__
25 #define __DRM_PANEL_H__
27 #include <linux/list.h>
32 struct display_timing;
35 * struct drm_panel_funcs - perform operations on a given panel
36 * @loader_protect: protect loader logo panel's power
37 * @disable: disable panel (turn off back light, etc.)
38 * @unprepare: turn off panel
39 * @prepare: turn on panel and perform set up
40 * @enable: enable panel (turn on back light, etc.)
41 * @get_modes: add modes to the connector that the panel is attached to and
42 * return the number of modes added
43 * @get_timings: copy display timings into the provided array and return
44 * the number of display timings available
46 * The .prepare() function is typically called before the display controller
47 * starts to transmit video data. Panel drivers can use this to turn the panel
48 * on and wait for it to become ready. If additional configuration is required
49 * (via a control bus such as I2C, SPI or DSI for example) this is a good time
52 * After the display controller has started transmitting video data, it's safe
53 * to call the .enable() function. This will typically enable the backlight to
54 * make the image on screen visible. Some panels require a certain amount of
55 * time or frames before the image is displayed. This function is responsible
56 * for taking this into account before enabling the backlight to avoid visual
59 * Before stopping video transmission from the display controller it can be
60 * necessary to turn off the panel to avoid visual glitches. This is done in
61 * the .disable() function. Analogously to .enable() this typically involves
62 * turning off the backlight and waiting for some time to make sure no image
63 * is visible on the panel. It is then safe for the display controller to
64 * cease transmission of video data.
66 * To save power when no video data is transmitted, a driver can power down
67 * the panel. This is the job of the .unprepare() function.
69 struct drm_panel_funcs {
70 int (*loader_protect)(struct drm_panel *panel, bool on);
71 int (*disable)(struct drm_panel *panel);
72 int (*unprepare)(struct drm_panel *panel);
73 int (*prepare)(struct drm_panel *panel);
74 int (*enable)(struct drm_panel *panel);
75 int (*get_modes)(struct drm_panel *panel);
76 int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
77 struct display_timing *timings);
81 struct drm_device *drm;
82 struct drm_connector *connector;
85 const struct drm_panel_funcs *funcs;
87 struct list_head list;
90 static inline int drm_panel_unprepare(struct drm_panel *panel)
92 if (panel && panel->funcs && panel->funcs->unprepare)
93 return panel->funcs->unprepare(panel);
95 return panel ? -ENOSYS : -EINVAL;
98 static inline int drm_panel_disable(struct drm_panel *panel)
100 if (panel && panel->funcs && panel->funcs->disable)
101 return panel->funcs->disable(panel);
103 return panel ? -ENOSYS : -EINVAL;
106 static inline int drm_panel_loader_protect(struct drm_panel *panel, bool on)
108 if (panel && panel->funcs && panel->funcs->loader_protect)
109 return panel->funcs->loader_protect(panel, on);
111 return panel ? -ENOSYS : -EINVAL;
114 static inline int drm_panel_prepare(struct drm_panel *panel)
116 if (panel && panel->funcs && panel->funcs->prepare)
117 return panel->funcs->prepare(panel);
119 return panel ? -ENOSYS : -EINVAL;
122 static inline int drm_panel_enable(struct drm_panel *panel)
124 if (panel && panel->funcs && panel->funcs->enable)
125 return panel->funcs->enable(panel);
127 return panel ? -ENOSYS : -EINVAL;
130 static inline int drm_panel_get_modes(struct drm_panel *panel)
132 if (panel && panel->funcs && panel->funcs->get_modes)
133 return panel->funcs->get_modes(panel);
135 return panel ? -ENOSYS : -EINVAL;
138 void drm_panel_init(struct drm_panel *panel);
140 int drm_panel_add(struct drm_panel *panel);
141 void drm_panel_remove(struct drm_panel *panel);
143 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);
144 int drm_panel_detach(struct drm_panel *panel);
147 struct drm_panel *of_drm_find_panel(struct device_node *np);
149 static inline struct drm_panel *of_drm_find_panel(struct device_node *np)