1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* Derived from drm_pci.c
*
* Copyright 2003 José Fonseca.
* Copyright 2003 Leif Delgass.
* Copyright (c) 2009, Code Aurora Forum.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <linux/export.h>
#include <drm/drmP.h>
/*
* Register.
*
* \param platdev - Platform device struture
* \return zero on success or a negative number on failure.
*
* Attempt to gets inter module "drm" information. If we are first
* then register the character device and inter module information.
* Try and register, if we fail to register, backout previous work.
*/
static int drm_get_platform_dev(struct platform_device *platdev,
struct drm_driver *driver)
{
struct drm_device *dev;
int ret;
DRM_DEBUG("\n");
dev = drm_dev_alloc(driver, &platdev->dev);
if (!dev)
return -ENOMEM;
dev->platformdev = platdev;
ret = drm_dev_register(dev, 0);
if (ret)
goto err_free;
DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
driver->name, driver->major, driver->minor, driver->patchlevel,
driver->date, dev->primary->index);
return 0;
err_free:
drm_dev_unref(dev);
return ret;
}
static const char *drm_platform_get_name(struct drm_device *dev)
{
return dev->platformdev->name;
}
static int drm_platform_set_busid(struct drm_device *dev, struct drm_master *master)
{
int len, ret, id;
master->unique_len = 13 + strlen(dev->platformdev->name);
master->unique_size = master->unique_len;
master->unique = kmalloc(master->unique_len + 1, GFP_KERNEL);
if (master->unique == NULL)
return -ENOMEM;
id = dev->platformdev->id;
/* if only a single instance of the platform device, id will be
* set to -1.. use 0 instead to avoid a funny looking bus-id:
*/
if (id == -1)
id = 0;
len = snprintf(master->unique, master->unique_len,
"platform:%s:%02d", dev->platformdev->name, id);
if (len > master->unique_len) {
DRM_ERROR("Unique buffer overflowed\n");
ret = -EINVAL;
goto err;
}
dev->devname =
kmalloc(strlen(dev->platformdev->name) +
master->unique_len + 2, GFP_KERNEL);
if (dev->devname == NULL) {
ret = -ENOMEM;
goto err;
}
sprintf(dev->devname, "%s@%s", dev->platformdev->name,
master->unique);
return 0;
err:
return ret;
}
static struct drm_bus drm_platform_bus = {
.get_name = drm_platform_get_name,
.set_busid = drm_platform_set_busid,
};
/**
* Platform device initialization. Called direct from modules.
*
* \return zero on success or a negative number on failure.
*
* Initializes a drm_device structures,registering the
* stubs
*
* Expands the \c DRIVER_PREINIT and \c DRIVER_POST_INIT macros before and
* after the initialization for driver customization.
*/
int drm_platform_init(struct drm_driver *driver, struct platform_device *platform_device)
{
DRM_DEBUG("\n");
driver->kdriver.platform_device = platform_device;
driver->bus = &drm_platform_bus;
return drm_get_platform_dev(platform_device, driver);
}
EXPORT_SYMBOL(drm_platform_init);
|
