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drm_panel.c revision 1.1 
      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 
     30 static DEFINE_MUTEX(panel_lock);
     31 static LIST_HEAD(panel_list);
     32 
     33 void drm_panel_init(struct drm_panel *panel)
     34 {
     35 	INIT_LIST_HEAD(&panel->list);
     36 }
     37 EXPORT_SYMBOL(drm_panel_init);
     38 
     39 int 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 }
     47 EXPORT_SYMBOL(drm_panel_add);
     48 
     49 void 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 }
     55 EXPORT_SYMBOL(drm_panel_remove);
     56 
     57 int 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 }
     67 EXPORT_SYMBOL(drm_panel_attach);
     68 
     69 int drm_panel_detach(struct drm_panel *panel)
     70 {
     71 	panel->connector = NULL;
     72 	panel->drm = NULL;
     73 
     74 	return 0;
     75 }
     76 EXPORT_SYMBOL(drm_panel_detach);
     77 
     78 #ifdef CONFIG_OF
     79 struct 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 }
     95 EXPORT_SYMBOL(of_drm_find_panel);
     96 #endif
     97 
     98 MODULE_AUTHOR("Thierry Reding <treding (at) nvidia.com>");
     99 MODULE_DESCRIPTION("DRM panel infrastructure");
    100 MODULE_LICENSE("GPL and additional rights");
    101