sys/dev/drm/drm_panel.c

   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");