Loading...
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#ifndef __DRM_PANEL_H__
25#define __DRM_PANEL_H__
26
27#include <linux/err.h>
28#include <linux/errno.h>
29#include <linux/list.h>
30
31struct device_node;
32struct drm_connector;
33struct drm_device;
34struct drm_panel;
35struct display_timing;
36
37/**
38 * struct drm_panel_funcs - perform operations on a given panel
39 *
40 * The .prepare() function is typically called before the display controller
41 * starts to transmit video data. Panel drivers can use this to turn the panel
42 * on and wait for it to become ready. If additional configuration is required
43 * (via a control bus such as I2C, SPI or DSI for example) this is a good time
44 * to do that.
45 *
46 * After the display controller has started transmitting video data, it's safe
47 * to call the .enable() function. This will typically enable the backlight to
48 * make the image on screen visible. Some panels require a certain amount of
49 * time or frames before the image is displayed. This function is responsible
50 * for taking this into account before enabling the backlight to avoid visual
51 * glitches.
52 *
53 * Before stopping video transmission from the display controller it can be
54 * necessary to turn off the panel to avoid visual glitches. This is done in
55 * the .disable() function. Analogously to .enable() this typically involves
56 * turning off the backlight and waiting for some time to make sure no image
57 * is visible on the panel. It is then safe for the display controller to
58 * cease transmission of video data.
59 *
60 * To save power when no video data is transmitted, a driver can power down
61 * the panel. This is the job of the .unprepare() function.
62 */
63struct drm_panel_funcs {
64 /**
65 * @prepare:
66 *
67 * Turn on panel and perform set up.
68 */
69 int (*prepare)(struct drm_panel *panel);
70
71 /**
72 * @enable:
73 *
74 * Enable panel (turn on back light, etc.).
75 */
76 int (*enable)(struct drm_panel *panel);
77
78 /**
79 * @disable:
80 *
81 * Disable panel (turn off back light, etc.).
82 */
83 int (*disable)(struct drm_panel *panel);
84
85 /**
86 * @unprepare:
87 *
88 * Turn off panel.
89 */
90 int (*unprepare)(struct drm_panel *panel);
91
92 /**
93 * @get_modes:
94 *
95 * Add modes to the connector that the panel is attached to and
96 * return the number of modes added.
97 */
98 int (*get_modes)(struct drm_panel *panel);
99
100 /**
101 * @get_timings:
102 *
103 * Copy display timings into the provided array and return
104 * the number of display timings available.
105 */
106 int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
107 struct display_timing *timings);
108};
109
110/**
111 * struct drm_panel - DRM panel object
112 */
113struct drm_panel {
114 /**
115 * @drm:
116 *
117 * DRM device owning the panel.
118 */
119 struct drm_device *drm;
120
121 /**
122 * @connector:
123 *
124 * DRM connector that the panel is attached to.
125 */
126 struct drm_connector *connector;
127
128 /**
129 * @dev:
130 *
131 * Parent device of the panel.
132 */
133 struct device *dev;
134
135 /**
136 * @funcs:
137 *
138 * Operations that can be performed on the panel.
139 */
140 const struct drm_panel_funcs *funcs;
141
142 /**
143 * @list:
144 *
145 * Panel entry in registry.
146 */
147 struct list_head list;
148};
149
150void drm_panel_init(struct drm_panel *panel);
151
152int drm_panel_add(struct drm_panel *panel);
153void drm_panel_remove(struct drm_panel *panel);
154
155int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector);
156void drm_panel_detach(struct drm_panel *panel);
157
158int drm_panel_prepare(struct drm_panel *panel);
159int drm_panel_unprepare(struct drm_panel *panel);
160
161int drm_panel_enable(struct drm_panel *panel);
162int drm_panel_disable(struct drm_panel *panel);
163
164int drm_panel_get_modes(struct drm_panel *panel);
165
166#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
167struct drm_panel *of_drm_find_panel(const struct device_node *np);
168#else
169static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
170{
171 return ERR_PTR(-ENODEV);
172}
173#endif
174
175#endif
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#ifndef __DRM_PANEL_H__
25#define __DRM_PANEL_H__
26
27#include <linux/err.h>
28#include <linux/errno.h>
29#include <linux/list.h>
30
31struct backlight_device;
32struct device_node;
33struct drm_connector;
34struct drm_device;
35struct drm_panel;
36struct display_timing;
37
38enum drm_panel_orientation;
39
40/**
41 * struct drm_panel_funcs - perform operations on a given panel
42 *
43 * The .prepare() function is typically called before the display controller
44 * starts to transmit video data. Panel drivers can use this to turn the panel
45 * on and wait for it to become ready. If additional configuration is required
46 * (via a control bus such as I2C, SPI or DSI for example) this is a good time
47 * to do that.
48 *
49 * After the display controller has started transmitting video data, it's safe
50 * to call the .enable() function. This will typically enable the backlight to
51 * make the image on screen visible. Some panels require a certain amount of
52 * time or frames before the image is displayed. This function is responsible
53 * for taking this into account before enabling the backlight to avoid visual
54 * glitches.
55 *
56 * Before stopping video transmission from the display controller it can be
57 * necessary to turn off the panel to avoid visual glitches. This is done in
58 * the .disable() function. Analogously to .enable() this typically involves
59 * turning off the backlight and waiting for some time to make sure no image
60 * is visible on the panel. It is then safe for the display controller to
61 * cease transmission of video data.
62 *
63 * To save power when no video data is transmitted, a driver can power down
64 * the panel. This is the job of the .unprepare() function.
65 *
66 * Backlight can be handled automatically if configured using
67 * drm_panel_of_backlight(). Then the driver does not need to implement the
68 * functionality to enable/disable backlight.
69 */
70struct drm_panel_funcs {
71 /**
72 * @prepare:
73 *
74 * Turn on panel and perform set up.
75 *
76 * This function is optional.
77 */
78 int (*prepare)(struct drm_panel *panel);
79
80 /**
81 * @enable:
82 *
83 * Enable panel (turn on back light, etc.).
84 *
85 * This function is optional.
86 */
87 int (*enable)(struct drm_panel *panel);
88
89 /**
90 * @disable:
91 *
92 * Disable panel (turn off back light, etc.).
93 *
94 * This function is optional.
95 */
96 int (*disable)(struct drm_panel *panel);
97
98 /**
99 * @unprepare:
100 *
101 * Turn off panel.
102 *
103 * This function is optional.
104 */
105 int (*unprepare)(struct drm_panel *panel);
106
107 /**
108 * @get_modes:
109 *
110 * Add modes to the connector that the panel is attached to
111 * and returns the number of modes added.
112 *
113 * This function is mandatory.
114 */
115 int (*get_modes)(struct drm_panel *panel,
116 struct drm_connector *connector);
117
118 /**
119 * @get_timings:
120 *
121 * Copy display timings into the provided array and return
122 * the number of display timings available.
123 *
124 * This function is optional.
125 */
126 int (*get_timings)(struct drm_panel *panel, unsigned int num_timings,
127 struct display_timing *timings);
128};
129
130/**
131 * struct drm_panel - DRM panel object
132 */
133struct drm_panel {
134 /**
135 * @dev:
136 *
137 * Parent device of the panel.
138 */
139 struct device *dev;
140
141 /**
142 * @backlight:
143 *
144 * Backlight device, used to turn on backlight after the call
145 * to enable(), and to turn off backlight before the call to
146 * disable().
147 * backlight is set by drm_panel_of_backlight() and drivers
148 * shall not assign it.
149 */
150 struct backlight_device *backlight;
151
152 /**
153 * @funcs:
154 *
155 * Operations that can be performed on the panel.
156 */
157 const struct drm_panel_funcs *funcs;
158
159 /**
160 * @connector_type:
161 *
162 * Type of the panel as a DRM_MODE_CONNECTOR_* value. This is used to
163 * initialise the drm_connector corresponding to the panel with the
164 * correct connector type.
165 */
166 int connector_type;
167
168 /**
169 * @list:
170 *
171 * Panel entry in registry.
172 */
173 struct list_head list;
174};
175
176void drm_panel_init(struct drm_panel *panel, struct device *dev,
177 const struct drm_panel_funcs *funcs,
178 int connector_type);
179
180void drm_panel_add(struct drm_panel *panel);
181void drm_panel_remove(struct drm_panel *panel);
182
183int drm_panel_prepare(struct drm_panel *panel);
184int drm_panel_unprepare(struct drm_panel *panel);
185
186int drm_panel_enable(struct drm_panel *panel);
187int drm_panel_disable(struct drm_panel *panel);
188
189int drm_panel_get_modes(struct drm_panel *panel, struct drm_connector *connector);
190
191#if defined(CONFIG_OF) && defined(CONFIG_DRM_PANEL)
192struct drm_panel *of_drm_find_panel(const struct device_node *np);
193int of_drm_get_panel_orientation(const struct device_node *np,
194 enum drm_panel_orientation *orientation);
195#else
196static inline struct drm_panel *of_drm_find_panel(const struct device_node *np)
197{
198 return ERR_PTR(-ENODEV);
199}
200
201static inline int of_drm_get_panel_orientation(const struct device_node *np,
202 enum drm_panel_orientation *orientation)
203{
204 return -ENODEV;
205}
206#endif
207
208#if IS_ENABLED(CONFIG_DRM_PANEL) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
209 (IS_MODULE(CONFIG_DRM) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE)))
210int drm_panel_of_backlight(struct drm_panel *panel);
211#else
212static inline int drm_panel_of_backlight(struct drm_panel *panel)
213{
214 return 0;
215}
216#endif
217
218#endif