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/* |
* Copyright (C) 2013, NVIDIA Corporation. All rights reserved. |
* |
* Permission is hereby granted, free of charge, to any person obtaining a |
* copy of this software and associated documentation files (the "Software"), |
* to deal in the Software without restriction, including without limitation |
* the rights to use, copy, modify, merge, publish, distribute, sub license, |
* and/or sell copies of the Software, and to permit persons to whom the |
* Software is furnished to do so, subject to the following conditions: |
* |
* The above copyright notice and this permission notice (including the |
* next paragraph) shall be included in all copies or substantial portions |
* of the Software. |
* |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
* DEALINGS IN THE SOFTWARE. |
*/ |
|
#ifndef __DRM_PANEL_H__ |
#define __DRM_PANEL_H__ |
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#include <linux/list.h> |
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struct drm_connector; |
struct drm_device; |
struct drm_panel; |
struct display_timing; |
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/** |
* struct drm_panel_funcs - perform operations on a given panel |
* @disable: disable panel (turn off back light, etc.) |
* @unprepare: turn off panel |
* @prepare: turn on panel and perform set up |
* @enable: enable panel (turn on back light, etc.) |
* @get_modes: add modes to the connector that the panel is attached to and |
* return the number of modes added |
* @get_timings: copy display timings into the provided array and return |
* the number of display timings available |
* |
* The .prepare() function is typically called before the display controller |
* starts to transmit video data. Panel drivers can use this to turn the panel |
* on and wait for it to become ready. If additional configuration is required |
* (via a control bus such as I2C, SPI or DSI for example) this is a good time |
* to do that. |
* |
* After the display controller has started transmitting video data, it's safe |
* to call the .enable() function. This will typically enable the backlight to |
* make the image on screen visible. Some panels require a certain amount of |
* time or frames before the image is displayed. This function is responsible |
* for taking this into account before enabling the backlight to avoid visual |
* glitches. |
* |
* Before stopping video transmission from the display controller it can be |
* necessary to turn off the panel to avoid visual glitches. This is done in |
* the .disable() function. Analogously to .enable() this typically involves |
* turning off the backlight and waiting for some time to make sure no image |
* is visible on the panel. It is then safe for the display controller to |
* cease transmission of video data. |
* |
* To save power when no video data is transmitted, a driver can power down |
* the panel. This is the job of the .unprepare() function. |
*/ |
struct drm_panel_funcs { |
int (*disable)(struct drm_panel *panel); |
int (*unprepare)(struct drm_panel *panel); |
int (*prepare)(struct drm_panel *panel); |
int (*enable)(struct drm_panel *panel); |
int (*get_modes)(struct drm_panel *panel); |
int (*get_timings)(struct drm_panel *panel, unsigned int num_timings, |
struct display_timing *timings); |
}; |
|
struct drm_panel { |
struct drm_device *drm; |
struct drm_connector *connector; |
struct device *dev; |
|
const struct drm_panel_funcs *funcs; |
|
struct list_head list; |
}; |
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static inline int drm_panel_unprepare(struct drm_panel *panel) |
{ |
if (panel && panel->funcs && panel->funcs->unprepare) |
return panel->funcs->unprepare(panel); |
|
return panel ? -ENOSYS : -EINVAL; |
} |
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static inline int drm_panel_disable(struct drm_panel *panel) |
{ |
if (panel && panel->funcs && panel->funcs->disable) |
return panel->funcs->disable(panel); |
|
return panel ? -ENOSYS : -EINVAL; |
} |
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static inline int drm_panel_prepare(struct drm_panel *panel) |
{ |
if (panel && panel->funcs && panel->funcs->prepare) |
return panel->funcs->prepare(panel); |
|
return panel ? -ENOSYS : -EINVAL; |
} |
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static inline int drm_panel_enable(struct drm_panel *panel) |
{ |
if (panel && panel->funcs && panel->funcs->enable) |
return panel->funcs->enable(panel); |
|
return panel ? -ENOSYS : -EINVAL; |
} |
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static inline int drm_panel_get_modes(struct drm_panel *panel) |
{ |
if (panel && panel->funcs && panel->funcs->get_modes) |
return panel->funcs->get_modes(panel); |
|
return panel ? -ENOSYS : -EINVAL; |
} |
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void drm_panel_init(struct drm_panel *panel); |
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int drm_panel_add(struct drm_panel *panel); |
void drm_panel_remove(struct drm_panel *panel); |
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int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector); |
int drm_panel_detach(struct drm_panel *panel); |
|
#ifdef CONFIG_OF |
struct drm_panel *of_drm_find_panel(struct device_node *np); |
#else |
static inline struct drm_panel *of_drm_find_panel(struct device_node *np) |
{ |
return NULL; |
} |
#endif |
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#endif |