1 /* 2 * Copyright (C) 2013, NVIDIA Corporation. All rights reserved. 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 #include <drm/drm_panel.h> 29 30 static DEFINE_MUTEX(panel_lock); 31 static LIST_HEAD(panel_list); 32 33 void drm_panel_init(struct drm_panel *panel) 34 { 35 INIT_LIST_HEAD(&panel->list); 36 } 37 EXPORT_SYMBOL(drm_panel_init); 38 39 int drm_panel_add(struct drm_panel *panel) 40 { 41 mutex_lock(&panel_lock); 42 list_add_tail(&panel->list, &panel_list); 43 mutex_unlock(&panel_lock); 44 45 return 0; 46 } 47 EXPORT_SYMBOL(drm_panel_add); 48 49 void drm_panel_remove(struct drm_panel *panel) 50 { 51 mutex_lock(&panel_lock); 52 list_del_init(&panel->list); 53 mutex_unlock(&panel_lock); 54 } 55 EXPORT_SYMBOL(drm_panel_remove); 56 57 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector) 58 { 59 if (panel->connector) 60 return -EBUSY; 61 62 panel->connector = connector; 63 panel->drm = connector->dev; 64 65 return 0; 66 } 67 EXPORT_SYMBOL(drm_panel_attach); 68 69 int drm_panel_detach(struct drm_panel *panel) 70 { 71 panel->connector = NULL; 72 panel->drm = NULL; 73 74 return 0; 75 } 76 EXPORT_SYMBOL(drm_panel_detach); 77 78 #ifdef CONFIG_OF 79 struct drm_panel *of_drm_find_panel(struct device_node *np) 80 { 81 struct drm_panel *panel; 82 83 mutex_lock(&panel_lock); 84 85 list_for_each_entry(panel, &panel_list, list) { 86 if (panel->dev->of_node == np) { 87 mutex_unlock(&panel_lock); 88 return panel; 89 } 90 } 91 92 mutex_unlock(&panel_lock); 93 return NULL; 94 } 95 EXPORT_SYMBOL(of_drm_find_panel); 96 #endif 97 98 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); 99 MODULE_DESCRIPTION("DRM panel infrastructure"); 100 MODULE_LICENSE("GPL and additional rights"); 101