1 /* 2 * Copyright (c) 2014 Samsung Electronics Co., Ltd 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sub license, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the 12 * next paragraph) shall be included in all copies or substantial portions 13 * of the Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 21 * DEALINGS IN THE SOFTWARE. 22 */ 23 24 #include <linux/err.h> 25 #include <linux/module.h> 26 27 #include <drm/drm_crtc.h> 28 29 #include "drm/drmP.h" 30 31 static DEFINE_MUTEX(bridge_lock); 32 static LIST_HEAD(bridge_list); 33 34 int drm_bridge_add(struct drm_bridge *bridge) 35 { 36 mutex_lock(&bridge_lock); 37 list_add_tail(&bridge->list, &bridge_list); 38 mutex_unlock(&bridge_lock); 39 40 return 0; 41 } 42 EXPORT_SYMBOL(drm_bridge_add); 43 44 void drm_bridge_remove(struct drm_bridge *bridge) 45 { 46 mutex_lock(&bridge_lock); 47 list_del_init(&bridge->list); 48 mutex_unlock(&bridge_lock); 49 } 50 EXPORT_SYMBOL(drm_bridge_remove); 51 52 extern int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge) 53 { 54 if (!dev || !bridge) 55 return -EINVAL; 56 57 if (bridge->dev) 58 return -EBUSY; 59 60 bridge->dev = dev; 61 62 if (bridge->funcs->attach) 63 return bridge->funcs->attach(bridge); 64 65 return 0; 66 } 67 EXPORT_SYMBOL(drm_bridge_attach); 68 69 #ifdef CONFIG_OF 70 struct drm_bridge *of_drm_find_bridge(struct device_node *np) 71 { 72 struct drm_bridge *bridge; 73 74 mutex_lock(&bridge_lock); 75 76 list_for_each_entry(bridge, &bridge_list, list) { 77 if (bridge->of_node == np) { 78 mutex_unlock(&bridge_lock); 79 return bridge; 80 } 81 } 82 83 mutex_unlock(&bridge_lock); 84 return NULL; 85 } 86 EXPORT_SYMBOL(of_drm_find_bridge); 87 #endif 88 89 MODULE_AUTHOR("Ajay Kumar <ajaykumar.rs@samsung.com>"); 90 MODULE_DESCRIPTION("DRM bridge infrastructure"); 91 MODULE_LICENSE("GPL and additional rights"); 92