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drm_panel.c revision 1.4 
      1 /*	$NetBSD: drm_panel.c,v 1.4 2020/01/03 21:01:16 jmcneill Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 2013, NVIDIA Corporation.  All rights reserved.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a
      7  * copy of this software and associated documentation files (the "Software"),
      8  * to deal in the Software without restriction, including without limitation
      9  * the rights to use, copy, modify, merge, publish, distribute, sub license,
     10  * and/or sell copies of the Software, and to permit persons to whom the
     11  * Software is furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the
     14  * next paragraph) shall be included in all copies or substantial portions
     15  * of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     23  * DEALINGS IN THE SOFTWARE.
     24  */
     25 
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: drm_panel.c,v 1.4 2020/01/03 21:01:16 jmcneill Exp $");
     28 
     29 #include <linux/err.h>
     30 #include <linux/module.h>
     31 
     32 #include <drm/drm_crtc.h>
     33 #include <drm/drm_panel.h>
     34 
     35 #ifdef __NetBSD__
     36 static struct mutex panel_lock;
     37 static struct list_head panel_list = LIST_HEAD_INIT(panel_list);
     38 #else
     39 static DEFINE_MUTEX(panel_lock);
     40 static LIST_HEAD(panel_list);
     41 #endif
     42 
     43 #ifdef __NetBSD__
     44 void drm_panel_init_lock(void)
     45 {
     46 	linux_mutex_init(&panel_lock);
     47 }
     48 void drm_panel_fini_lock(void)
     49 {
     50 	linux_mutex_destroy(&panel_lock);
     51 }
     52 #endif
     53 
     54 void drm_panel_init(struct drm_panel *panel)
     55 {
     56 	INIT_LIST_HEAD(&panel->list);
     57 }
     58 EXPORT_SYMBOL(drm_panel_init);
     59 
     60 int drm_panel_add(struct drm_panel *panel)
     61 {
     62 	mutex_lock(&panel_lock);
     63 	list_add_tail(&panel->list, &panel_list);
     64 	mutex_unlock(&panel_lock);
     65 
     66 	return 0;
     67 }
     68 EXPORT_SYMBOL(drm_panel_add);
     69 
     70 void drm_panel_remove(struct drm_panel *panel)
     71 {
     72 	mutex_lock(&panel_lock);
     73 	list_del_init(&panel->list);
     74 	mutex_unlock(&panel_lock);
     75 }
     76 EXPORT_SYMBOL(drm_panel_remove);
     77 
     78 int drm_panel_attach(struct drm_panel *panel, struct drm_connector *connector)
     79 {
     80 	if (panel->connector)
     81 		return -EBUSY;
     82 
     83 	panel->connector = connector;
     84 	panel->drm = connector->dev;
     85 
     86 	return 0;
     87 }
     88 EXPORT_SYMBOL(drm_panel_attach);
     89 
     90 int drm_panel_detach(struct drm_panel *panel)
     91 {
     92 	panel->connector = NULL;
     93 	panel->drm = NULL;
     94 
     95 	return 0;
     96 }
     97 EXPORT_SYMBOL(drm_panel_detach);
     98 
     99 #ifdef CONFIG_OF
    100 struct drm_panel *of_drm_find_panel(struct device_node *np)
    101 {
    102 	struct drm_panel *panel;
    103 
    104 	mutex_lock(&panel_lock);
    105 
    106 	list_for_each_entry(panel, &panel_list, list) {
    107 		if (panel->dev->of_node == np) {
    108 			mutex_unlock(&panel_lock);
    109 			return panel;
    110 		}
    111 	}
    112 
    113 	mutex_unlock(&panel_lock);
    114 	return NULL;
    115 }
    116 EXPORT_SYMBOL(of_drm_find_panel);
    117 #endif
    118 
    119 MODULE_AUTHOR("Thierry Reding <treding (at) nvidia.com>");
    120 MODULE_DESCRIPTION("DRM panel infrastructure");
    121 MODULE_LICENSE("GPL and additional rights");
    122