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1 | /************************************************************************** |
2 | * | |
3 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA | |
4 | * 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 | |
8 | * "Software"), to deal in the Software without restriction, including | |
9 | * without limitation the rights to use, copy, modify, merge, publish, | |
10 | * distribute, sub license, and/or sell copies of the Software, and to | |
11 | * permit persons to whom the Software is furnished to do so, subject to | |
12 | * the following conditions: | |
13 | * | |
14 | * The above copyright notice and this permission notice (including the | |
15 | * next paragraph) shall be included in all copies or substantial portions | |
16 | * of the Software. | |
17 | * | |
18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL | |
21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, | |
22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | |
23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | |
24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. | |
25 | * | |
26 | **************************************************************************/ | |
27 | /* | |
28 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> | |
29 | * Jerome Glisse | |
30 | */ | |
31 | #include <linux/module.h> | |
e9840be8 TH |
32 | #include <linux/device.h> |
33 | #include <linux/sched.h> | |
760285e7 DH |
34 | #include <drm/ttm/ttm_module.h> |
35 | #include <drm/drm_sysfs.h> | |
e9840be8 TH |
36 | |
37 | static DECLARE_WAIT_QUEUE_HEAD(exit_q); | |
38 | atomic_t device_released; | |
39 | ||
40 | static struct device_type ttm_drm_class_type = { | |
41 | .name = "ttm", | |
42 | /** | |
43 | * Add pm ops here. | |
44 | */ | |
45 | }; | |
46 | ||
47 | static void ttm_drm_class_device_release(struct device *dev) | |
48 | { | |
49 | atomic_set(&device_released, 1); | |
50 | wake_up_all(&exit_q); | |
51 | } | |
52 | ||
53 | static struct device ttm_drm_class_device = { | |
54 | .type = &ttm_drm_class_type, | |
55 | .release = &ttm_drm_class_device_release | |
56 | }; | |
57 | ||
58 | struct kobject *ttm_get_kobj(void) | |
59 | { | |
60 | struct kobject *kobj = &ttm_drm_class_device.kobj; | |
61 | BUG_ON(kobj == NULL); | |
62 | return kobj; | |
63 | } | |
ba4e7d97 TH |
64 | |
65 | static int __init ttm_init(void) | |
66 | { | |
e9840be8 TH |
67 | int ret; |
68 | ||
69 | ret = dev_set_name(&ttm_drm_class_device, "ttm"); | |
70 | if (unlikely(ret != 0)) | |
71 | return ret; | |
72 | ||
e9840be8 TH |
73 | atomic_set(&device_released, 0); |
74 | ret = drm_class_device_register(&ttm_drm_class_device); | |
75 | if (unlikely(ret != 0)) | |
76 | goto out_no_dev_reg; | |
77 | ||
ba4e7d97 | 78 | return 0; |
e9840be8 TH |
79 | out_no_dev_reg: |
80 | atomic_set(&device_released, 1); | |
81 | wake_up_all(&exit_q); | |
e9840be8 | 82 | return ret; |
ba4e7d97 TH |
83 | } |
84 | ||
85 | static void __exit ttm_exit(void) | |
86 | { | |
e9840be8 TH |
87 | drm_class_device_unregister(&ttm_drm_class_device); |
88 | ||
89 | /** | |
90 | * Refuse to unload until the TTM device is released. | |
91 | * Not sure this is 100% needed. | |
92 | */ | |
93 | ||
94 | wait_event(exit_q, atomic_read(&device_released) == 1); | |
ba4e7d97 TH |
95 | } |
96 | ||
97 | module_init(ttm_init); | |
98 | module_exit(ttm_exit); | |
99 | ||
100 | MODULE_AUTHOR("Thomas Hellstrom, Jerome Glisse"); | |
101 | MODULE_DESCRIPTION("TTM memory manager subsystem (for DRM device)"); | |
102 | MODULE_LICENSE("GPL and additional rights"); |