drivers/gpu/drm/exynos/exynos_drm_core.c

   1 /* exynos_drm_core.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Author:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include "exynos_drm_drv.h"
  17 #include "exynos_drm_crtc.h"
  18 #include "exynos_drm_encoder.h"
  19 #include "exynos_drm_fbdev.h"
  20
  21 static LIST_HEAD(exynos_drm_subdrv_list);
  22
  23 int exynos_drm_subdrv_register(struct exynos_drm_subdrv *subdrv)
  24 {
  25         if (!subdrv)
  26                 return -EINVAL;
  27
  28         list_add_tail(&subdrv->list, &exynos_drm_subdrv_list);
  29
  30         return 0;
  31 }
  32 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_register);
  33
  34 int exynos_drm_subdrv_unregister(struct exynos_drm_subdrv *subdrv)
  35 {
  36         if (!subdrv)
  37                 return -EINVAL;
  38
  39         list_del(&subdrv->list);
  40
  41         return 0;
  42 }
  43 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_unregister);
  44
  45 int exynos_drm_device_subdrv_probe(struct drm_device *dev)
  46 {
  47         struct exynos_drm_subdrv *subdrv, *n;
  48         int err;
  49
  50         if (!dev)
  51                 return -EINVAL;
  52
  53         list_for_each_entry_safe(subdrv, n, &exynos_drm_subdrv_list, list) {
  54                 if (subdrv->probe) {
  55                         subdrv->drm_dev = dev;
  56
  57                         /*
  58                          * this probe callback would be called by sub driver
  59                          * after setting of all resources to this sub driver,
  60                          * such as clock, irq and register map are done.
  61                          */
  62                         err = subdrv->probe(dev, subdrv->dev);
  63                         if (err) {
  64                                 DRM_DEBUG("exynos drm subdrv probe failed.\n");
  65                                 list_del(&subdrv->list);
  66                                 continue;
  67                         }
  68                 }
  69         }
  70
  71         return 0;
  72 }
  73 EXPORT_SYMBOL_GPL(exynos_drm_device_subdrv_probe);
  74
  75 int exynos_drm_device_subdrv_remove(struct drm_device *dev)
  76 {
  77         struct exynos_drm_subdrv *subdrv;
  78
  79         if (!dev) {
  80                 WARN(1, "Unexpected drm device unregister!\n");
  81                 return -EINVAL;
  82         }
  83
  84         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
  85                 if (subdrv->remove)
  86                         subdrv->remove(dev, subdrv->dev);
  87         }
  88
  89         return 0;
  90 }
  91 EXPORT_SYMBOL_GPL(exynos_drm_device_subdrv_remove);
  92
  93 int exynos_drm_subdrv_open(struct drm_device *dev, struct drm_file *file)
  94 {
  95         struct exynos_drm_subdrv *subdrv;
  96         int ret;
  97
  98         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
  99                 if (subdrv->open) {
 100                         ret = subdrv->open(dev, subdrv->dev, file);
 101                         if (ret)
 102                                 goto err;
 103                 }
 104         }
 105
 106         return 0;
 107
 108 err:
 109         list_for_each_entry_reverse(subdrv, &subdrv->list, list) {
 110                 if (subdrv->close)
 111                         subdrv->close(dev, subdrv->dev, file);
 112         }
 113         return ret;
 114 }
 115 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_open);
 116
 117 void exynos_drm_subdrv_close(struct drm_device *dev, struct drm_file *file)
 118 {
 119         struct exynos_drm_subdrv *subdrv;
 120
 121         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 122                 if (subdrv->close)
 123                         subdrv->close(dev, subdrv->dev, file);
 124         }
 125 }
 126 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_close);