LXR linux/drivers/gpu/drm/drm

   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
  30static DEFINE_MUTEX(panel_lock);
  31static LIST_HEAD(panel_list);
  32
  33void drm_panel_init(struct drm_panel *panel)
  34{
  35        INIT_LIST_HEAD(&panel->list);
  36}
  37EXPORT_SYMBOL(drm_panel_init);
  38
  39int 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}
  47EXPORT_SYMBOL(drm_panel_add);
  48
  49void 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}
  55EXPORT_SYMBOL(drm_panel_remove);
  56
  57int 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}
  67EXPORT_SYMBOL(drm_panel_attach);
  68
  69int drm_panel_detach(struct drm_panel *panel)
  70{
  71        panel->connector = NULL;
  72        panel->drm = NULL;
  73
  74        return 0;
  75}
  76EXPORT_SYMBOL(drm_panel_detach);
  77
  78#ifdef CONFIG_OF
  79struct 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}
  95EXPORT_SYMBOL(of_drm_find_panel);
  96#endif
  97
  98MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
  99MODULE_DESCRIPTION("DRM panel infrastructure");
 100MODULE_LICENSE("GPL and additional rights");
 101