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_fbdev.h"
  19
  20 static LIST_HEAD(exynos_drm_subdrv_list);
  21
  22 int exynos_drm_subdrv_register(struct exynos_drm_subdrv *subdrv)
  23 {
  24         if (!subdrv)
  25                 return -EINVAL;
  26
  27         list_add_tail(&subdrv->list, &exynos_drm_subdrv_list);
  28
  29         return 0;
  30 }
  31 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_register);
  32
  33 int exynos_drm_subdrv_unregister(struct exynos_drm_subdrv *subdrv)
  34 {
  35         if (!subdrv)
  36                 return -EINVAL;
  37
  38         list_del(&subdrv->list);
  39
  40         return 0;
  41 }
  42 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_unregister);
  43
  44 int exynos_drm_device_subdrv_probe(struct drm_device *dev)
  45 {
  46         struct exynos_drm_subdrv *subdrv, *n;
  47         int err;
  48
  49         if (!dev)
  50                 return -EINVAL;
  51
  52         list_for_each_entry_safe(subdrv, n, &exynos_drm_subdrv_list, list) {
  53                 if (subdrv->probe) {
  54                         subdrv->drm_dev = dev;
  55
  56                         /*
  57                          * this probe callback would be called by sub driver
  58                          * after setting of all resources to this sub driver,
  59                          * such as clock, irq and register map are done.
  60                          */
  61                         err = subdrv->probe(dev, subdrv->dev);
  62                         if (err) {
  63                                 DRM_DEBUG("exynos drm subdrv probe failed.\n");
  64                                 list_del(&subdrv->list);
  65                                 continue;
  66                         }
  67                 }
  68         }
  69
  70         return 0;
  71 }
  72 EXPORT_SYMBOL_GPL(exynos_drm_device_subdrv_probe);
  73
  74 int exynos_drm_device_subdrv_remove(struct drm_device *dev)
  75 {
  76         struct exynos_drm_subdrv *subdrv;
  77
  78         if (!dev) {
  79                 WARN(1, "Unexpected drm device unregister!\n");
  80                 return -EINVAL;
  81         }
  82
  83         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
  84                 if (subdrv->remove)
  85                         subdrv->remove(dev, subdrv->dev);
  86         }
  87
  88         return 0;
  89 }
  90 EXPORT_SYMBOL_GPL(exynos_drm_device_subdrv_remove);
  91
  92 int exynos_drm_subdrv_open(struct drm_device *dev, struct drm_file *file)
  93 {
  94         struct exynos_drm_subdrv *subdrv;
  95         int ret;
  96
  97         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
  98                 if (subdrv->open) {
  99                         ret = subdrv->open(dev, subdrv->dev, file);
 100                         if (ret)
 101                                 goto err;
 102                 }
 103         }
 104
 105         return 0;
 106
 107 err:
 108         list_for_each_entry_reverse(subdrv, &subdrv->list, list) {
 109                 if (subdrv->close)
 110                         subdrv->close(dev, subdrv->dev, file);
 111         }
 112         return ret;
 113 }
 114 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_open);
 115
 116 void exynos_drm_subdrv_close(struct drm_device *dev, struct drm_file *file)
 117 {
 118         struct exynos_drm_subdrv *subdrv;
 119
 120         list_for_each_entry(subdrv, &exynos_drm_subdrv_list, list) {
 121                 if (subdrv->close)
 122                         subdrv->close(dev, subdrv->dev, file);
 123         }
 124 }
 125 EXPORT_SYMBOL_GPL(exynos_drm_subdrv_close);