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");