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
17 #include "exynos_drm_drv.h"
18 #include "exynos_drm_crtc.h"
19
20 static LIST_HEAD(exynos_drm_subdrv_list);
21
exynos_drm_subdrv_register(struct exynos_drm_subdrv * subdrv)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
exynos_drm_subdrv_unregister(struct exynos_drm_subdrv * subdrv)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
exynos_drm_device_subdrv_probe(struct drm_device * dev)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
exynos_drm_device_subdrv_remove(struct drm_device * dev)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
exynos_drm_subdrv_open(struct drm_device * dev,struct drm_file * file)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_continue_reverse(subdrv, &exynos_drm_subdrv_list, list) {
105 if (subdrv->close)
106 subdrv->close(dev, subdrv->dev, file);
107 }
108 return ret;
109 }
110
exynos_drm_subdrv_close(struct drm_device * dev,struct drm_file * file)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 }
120