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