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 #ifdef __linux__ 25 #include <linux/err.h> 26 #include <linux/module.h> 27 #endif 28 29 #include <dev/pci/drm/drmP.h> 30 #include <dev/pci/drm/drm_crtc.h> 31 #include <dev/pci/drm/drm_panel.h> 32 33 static DEFINE_MUTEX(panel_lock); 34 static DRM_LIST_HEAD(panel_list); 35 36 void drm_panel_init(struct drm_panel *panel) 37 { 38 INIT_LIST_HEAD(&panel->list); 39 } 40 EXPORT_SYMBOL(drm_panel_init); 41 42 int drm_panel_add(struct drm_panel *panel) 43 { 44 mutex_lock(&panel_lock); 45 list_add_tail(&panel->list, &panel_list); 46 mutex_unlock(&panel_lock); 47 48 return 0; 49 } 50 EXPORT_SYMBOL(drm_panel_add); 51 52 void drm_panel_remove(struct drm_panel *panel) 53 { 54 mutex_lock(&panel_lock); 55 list_del_init(&panel->list); 56 mutex_unlock(&panel_lock); 57 } 58 EXPORT_SYMBOL(drm_panel_remove); 59 60 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector) 61 { 62 if (panel->connector) 63 return -EBUSY; 64 65 panel->connector = connector; 66 panel->drm = connector->dev; 67 68 return 0; 69 } 70 EXPORT_SYMBOL(drm_panel_attach); 71 72 int drm_panel_detach(struct drm_panel *panel) 73 { 74 panel->connector = NULL; 75 panel->drm = NULL; 76 77 return 0; 78 } 79 EXPORT_SYMBOL(drm_panel_detach); 80 81 #ifdef CONFIG_OF 82 struct drm_panel *of_drm_find_panel(struct device_node *np) 83 { 84 struct drm_panel *panel; 85 86 mutex_lock(&panel_lock); 87 88 list_for_each_entry(panel, &panel_list, list) { 89 if (panel->dev->of_node == np) { 90 mutex_unlock(&panel_lock); 91 return panel; 92 } 93 } 94 95 mutex_unlock(&panel_lock); 96 return NULL; 97 } 98 EXPORT_SYMBOL(of_drm_find_panel); 99 #endif 100 101 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); 102 MODULE_DESCRIPTION("DRM panel infrastructure"); 103 MODULE_LICENSE("GPL and additional rights"); 104