bdf97a004b
Create the framework to support external dp aux bridge device which can handle DPCD/I2C/HPD from external. Change-Id: Iabd0998efc8bf7134d186b1751d219c00217385c Signed-off-by: Xiaowen Wu <wxiaowen@codeaurora.org> Signed-off-by: Karim Henain <khenain@codeaurora.org> Signed-off-by: Sudarsan Ramesh <sudarame@codeaurora.org>
71 lines
2.3 KiB
C
71 lines
2.3 KiB
C
/*
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* Copyright (c) 2019-2021, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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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 "dp_aux_bridge.h"
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static DEFINE_MUTEX(dp_aux_bridge_lock);
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static LIST_HEAD(du_aux_bridge_list);
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int dp_aux_add_bridge(struct dp_aux_bridge *bridge)
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{
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mutex_lock(&dp_aux_bridge_lock);
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list_add_tail(&bridge->head, &du_aux_bridge_list);
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mutex_unlock(&dp_aux_bridge_lock);
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return 0;
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}
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#ifdef CONFIG_OF
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struct dp_aux_bridge *of_dp_aux_find_bridge(struct device_node *np)
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{
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struct dp_aux_bridge *bridge;
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mutex_lock(&dp_aux_bridge_lock);
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list_for_each_entry(bridge, &du_aux_bridge_list, head) {
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if (bridge->of_node == np) {
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mutex_unlock(&dp_aux_bridge_lock);
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return bridge;
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}
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}
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mutex_unlock(&dp_aux_bridge_lock);
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return NULL;
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}
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#endif
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