mirror of https://gitee.com/openkylin/linux.git
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
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/*
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* Copyright (c) 2014 Samsung Electronics Co., Ltd
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sub license,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/err.h>
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#include <linux/module.h>
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#include <drm/drm_crtc.h>
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#include "drm/drmP.h"
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static DEFINE_MUTEX(bridge_lock);
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static LIST_HEAD(bridge_list);
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int drm_bridge_add(struct drm_bridge *bridge)
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{
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mutex_lock(&bridge_lock);
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list_add_tail(&bridge->list, &bridge_list);
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mutex_unlock(&bridge_lock);
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return 0;
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}
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EXPORT_SYMBOL(drm_bridge_add);
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void drm_bridge_remove(struct drm_bridge *bridge)
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{
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mutex_lock(&bridge_lock);
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list_del_init(&bridge->list);
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mutex_unlock(&bridge_lock);
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}
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EXPORT_SYMBOL(drm_bridge_remove);
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extern int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge)
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{
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if (!dev || !bridge)
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return -EINVAL;
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if (bridge->dev)
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return -EBUSY;
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bridge->dev = dev;
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if (bridge->funcs->attach)
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return bridge->funcs->attach(bridge);
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return 0;
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}
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EXPORT_SYMBOL(drm_bridge_attach);
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#ifdef CONFIG_OF
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struct drm_bridge *of_drm_find_bridge(struct device_node *np)
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{
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struct drm_bridge *bridge;
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mutex_lock(&bridge_lock);
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list_for_each_entry(bridge, &bridge_list, list) {
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if (bridge->of_node == np) {
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mutex_unlock(&bridge_lock);
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return bridge;
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}
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}
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mutex_unlock(&bridge_lock);
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return NULL;
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}
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EXPORT_SYMBOL(of_drm_find_bridge);
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#endif
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MODULE_AUTHOR("Ajay Kumar <ajaykumar.rs@samsung.com>");
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MODULE_DESCRIPTION("DRM bridge infrastructure");
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MODULE_LICENSE("GPL and additional rights");
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