162 строки
4.4 KiB
C
162 строки
4.4 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/module.h>
|
|
|
|
#include <drm/drm_crtc.h>
|
|
#include <drm/drm_panel.h>
|
|
|
|
static DEFINE_MUTEX(panel_lock);
|
|
static LIST_HEAD(panel_list);
|
|
|
|
/**
|
|
* DOC: drm panel
|
|
*
|
|
* The DRM panel helpers allow drivers to register panel objects with a
|
|
* central registry and provide functions to retrieve those panels in display
|
|
* drivers.
|
|
*/
|
|
|
|
/**
|
|
* drm_panel_init - initialize a panel
|
|
* @panel: DRM panel
|
|
*
|
|
* Sets up internal fields of the panel so that it can subsequently be added
|
|
* to the registry.
|
|
*/
|
|
void drm_panel_init(struct drm_panel *panel)
|
|
{
|
|
INIT_LIST_HEAD(&panel->list);
|
|
}
|
|
EXPORT_SYMBOL(drm_panel_init);
|
|
|
|
/**
|
|
* drm_panel_add - add a panel to the global registry
|
|
* @panel: panel to add
|
|
*
|
|
* Add a panel to the global registry so that it can be looked up by display
|
|
* drivers.
|
|
*
|
|
* Return: 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_panel_add(struct drm_panel *panel)
|
|
{
|
|
mutex_lock(&panel_lock);
|
|
list_add_tail(&panel->list, &panel_list);
|
|
mutex_unlock(&panel_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_panel_add);
|
|
|
|
/**
|
|
* drm_panel_remove - remove a panel from the global registry
|
|
* @panel: DRM panel
|
|
*
|
|
* Removes a panel from the global registry.
|
|
*/
|
|
void drm_panel_remove(struct drm_panel *panel)
|
|
{
|
|
mutex_lock(&panel_lock);
|
|
list_del_init(&panel->list);
|
|
mutex_unlock(&panel_lock);
|
|
}
|
|
EXPORT_SYMBOL(drm_panel_remove);
|
|
|
|
/**
|
|
* drm_panel_attach - attach a panel to a connector
|
|
* @panel: DRM panel
|
|
* @connector: DRM connector
|
|
*
|
|
* After obtaining a pointer to a DRM panel a display driver calls this
|
|
* function to attach a panel to a connector.
|
|
*
|
|
* An error is returned if the panel is already attached to another connector.
|
|
*
|
|
* Return: 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector)
|
|
{
|
|
if (panel->connector)
|
|
return -EBUSY;
|
|
|
|
panel->connector = connector;
|
|
panel->drm = connector->dev;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_panel_attach);
|
|
|
|
/**
|
|
* drm_panel_detach - detach a panel from a connector
|
|
* @panel: DRM panel
|
|
*
|
|
* Detaches a panel from the connector it is attached to. If a panel is not
|
|
* attached to any connector this is effectively a no-op.
|
|
*
|
|
* Return: 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_panel_detach(struct drm_panel *panel)
|
|
{
|
|
panel->connector = NULL;
|
|
panel->drm = NULL;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(drm_panel_detach);
|
|
|
|
#ifdef CONFIG_OF
|
|
/**
|
|
* of_drm_find_panel - look up a panel using a device tree node
|
|
* @np: device tree node of the panel
|
|
*
|
|
* Searches the set of registered panels for one that matches the given device
|
|
* tree node. If a matching panel is found, return a pointer to it.
|
|
*
|
|
* Return: A pointer to the panel registered for the specified device tree
|
|
* node or NULL if no panel matching the device tree node can be found.
|
|
*/
|
|
struct drm_panel *of_drm_find_panel(struct device_node *np)
|
|
{
|
|
struct drm_panel *panel;
|
|
|
|
mutex_lock(&panel_lock);
|
|
|
|
list_for_each_entry(panel, &panel_list, list) {
|
|
if (panel->dev->of_node == np) {
|
|
mutex_unlock(&panel_lock);
|
|
return panel;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&panel_lock);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(of_drm_find_panel);
|
|
#endif
|
|
|
|
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
|
|
MODULE_DESCRIPTION("DRM panel infrastructure");
|
|
MODULE_LICENSE("GPL and additional rights");
|