Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ttm_module.c
Go to the documentation of this file.
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>
32 #include <linux/device.h>
33 #include <linux/sched.h>
34 #include <drm/ttm/ttm_module.h>
35 #include <drm/drm_sysfs.h>
36 
37 static DECLARE_WAIT_QUEUE_HEAD(exit_q);
39 
40 static struct device_type ttm_drm_class_type = {
41  .name = "ttm",
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 }
64 
65 static int __init ttm_init(void)
66 {
67  int ret;
68 
69  ret = dev_set_name(&ttm_drm_class_device, "ttm");
70  if (unlikely(ret != 0))
71  return ret;
72 
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 
78  return 0;
79 out_no_dev_reg:
80  atomic_set(&device_released, 1);
81  wake_up_all(&exit_q);
82  return ret;
83 }
84 
85 static void __exit ttm_exit(void)
86 {
87  drm_class_device_unregister(&ttm_drm_class_device);
88 
94  wait_event(exit_q, atomic_read(&device_released) == 1);
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");