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/drmP.h> 28 #include <drm/drm_crtc.h> 29 #include <drm/drm_panel.h> 30 31 static DEFINE_MUTEX(panel_lock); 32 static LINUX_LIST_HEAD(panel_list); 33 34 void drm_panel_init(struct drm_panel *panel) 35 { 36 INIT_LIST_HEAD(&panel->list); 37 } 38 EXPORT_SYMBOL(drm_panel_init); 39 40 int drm_panel_add(struct drm_panel *panel) 41 { 42 mutex_lock(&panel_lock); 43 list_add_tail(&panel->list, &panel_list); 44 mutex_unlock(&panel_lock); 45 46 return 0; 47 } 48 EXPORT_SYMBOL(drm_panel_add); 49 50 void drm_panel_remove(struct drm_panel *panel) 51 { 52 mutex_lock(&panel_lock); 53 list_del_init(&panel->list); 54 mutex_unlock(&panel_lock); 55 } 56 EXPORT_SYMBOL(drm_panel_remove); 57 58 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector) 59 { 60 if (panel->connector) 61 return -EBUSY; 62 63 panel->connector = connector; 64 panel->drm = connector->dev; 65 66 return 0; 67 } 68 EXPORT_SYMBOL(drm_panel_attach); 69 70 int drm_panel_detach(struct drm_panel *panel) 71 { 72 panel->connector = NULL; 73 panel->drm = NULL; 74 75 return 0; 76 } 77 EXPORT_SYMBOL(drm_panel_detach); 78 79 #ifdef CONFIG_OF 80 struct drm_panel *of_drm_find_panel(struct device_node *np) 81 { 82 struct drm_panel *panel; 83 84 mutex_lock(&panel_lock); 85 86 list_for_each_entry(panel, &panel_list, list) { 87 if (panel->dev->of_node == np) { 88 mutex_unlock(&panel_lock); 89 return panel; 90 } 91 } 92 93 mutex_unlock(&panel_lock); 94 return NULL; 95 } 96 EXPORT_SYMBOL(of_drm_find_panel); 97 #endif 98 99 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); 100 MODULE_DESCRIPTION("DRM panel infrastructure"); 101