From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/gpu/drm/drm_bridge.c | 91 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 91 insertions(+) create mode 100644 drivers/gpu/drm/drm_bridge.c (limited to 'drivers/gpu/drm/drm_bridge.c') diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c new file mode 100644 index 000000000..eaa5790c2 --- /dev/null +++ b/drivers/gpu/drm/drm_bridge.c @@ -0,0 +1,91 @@ +/* + * Copyright (c) 2014 Samsung Electronics Co., Ltd + * + * 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 +#include + +#include + +#include "drm/drmP.h" + +static DEFINE_MUTEX(bridge_lock); +static LIST_HEAD(bridge_list); + +int drm_bridge_add(struct drm_bridge *bridge) +{ + mutex_lock(&bridge_lock); + list_add_tail(&bridge->list, &bridge_list); + mutex_unlock(&bridge_lock); + + return 0; +} +EXPORT_SYMBOL(drm_bridge_add); + +void drm_bridge_remove(struct drm_bridge *bridge) +{ + mutex_lock(&bridge_lock); + list_del_init(&bridge->list); + mutex_unlock(&bridge_lock); +} +EXPORT_SYMBOL(drm_bridge_remove); + +int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge) +{ + if (!dev || !bridge) + return -EINVAL; + + if (bridge->dev) + return -EBUSY; + + bridge->dev = dev; + + if (bridge->funcs->attach) + return bridge->funcs->attach(bridge); + + return 0; +} +EXPORT_SYMBOL(drm_bridge_attach); + +#ifdef CONFIG_OF +struct drm_bridge *of_drm_find_bridge(struct device_node *np) +{ + struct drm_bridge *bridge; + + mutex_lock(&bridge_lock); + + list_for_each_entry(bridge, &bridge_list, list) { + if (bridge->of_node == np) { + mutex_unlock(&bridge_lock); + return bridge; + } + } + + mutex_unlock(&bridge_lock); + return NULL; +} +EXPORT_SYMBOL(of_drm_find_bridge); +#endif + +MODULE_AUTHOR("Ajay Kumar "); +MODULE_DESCRIPTION("DRM bridge infrastructure"); +MODULE_LICENSE("GPL and additional rights"); -- cgit v1.2.3-54-g00ecf