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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
|
/*
* soundbus
*
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
*
* GPL v2, can be found in COPYING.
*/
#include <linux/module.h>
#include "soundbus.h"
MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Apple Soundbus");
struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
{
struct device *tmp;
if (!dev)
return NULL;
tmp = get_device(&dev->ofdev.dev);
if (tmp)
return to_soundbus_device(tmp);
else
return NULL;
}
EXPORT_SYMBOL_GPL(soundbus_dev_get);
void soundbus_dev_put(struct soundbus_dev *dev)
{
if (dev)
put_device(&dev->ofdev.dev);
}
EXPORT_SYMBOL_GPL(soundbus_dev_put);
static int soundbus_probe(struct device *dev)
{
int error = -ENODEV;
struct soundbus_driver *drv;
struct soundbus_dev *soundbus_dev;
drv = to_soundbus_driver(dev->driver);
soundbus_dev = to_soundbus_device(dev);
if (!drv->probe)
return error;
soundbus_dev_get(soundbus_dev);
error = drv->probe(soundbus_dev);
if (error)
soundbus_dev_put(soundbus_dev);
return error;
}
static int soundbus_uevent(struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
{
struct soundbus_dev * soundbus_dev;
struct of_device * of;
char *scratch, *compat, *compat2;
int i = 0;
int length, cplen, cplen2, seen = 0;
if (!dev)
return -ENODEV;
soundbus_dev = to_soundbus_device(dev);
if (!soundbus_dev)
return -ENODEV;
of = &soundbus_dev->ofdev;
/* stuff we want to pass to /sbin/hotplug */
envp[i++] = scratch = buffer;
length = scnprintf (scratch, buffer_size, "OF_NAME=%s", of->node->name);
++length;
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
scratch += length;
envp[i++] = scratch;
length = scnprintf (scratch, buffer_size, "OF_TYPE=%s", of->node->type);
++length;
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
scratch += length;
/* Since the compatible field can contain pretty much anything
* it's not really legal to split it out with commas. We split it
* up using a number of environment variables instead. */
compat = (char *) get_property(of->node, "compatible", &cplen);
compat2 = compat;
cplen2= cplen;
while (compat && cplen > 0) {
envp[i++] = scratch;
length = scnprintf (scratch, buffer_size,
"OF_COMPATIBLE_%d=%s", seen, compat);
++length;
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
scratch += length;
length = strlen (compat) + 1;
compat += length;
cplen -= length;
seen++;
}
envp[i++] = scratch;
length = scnprintf (scratch, buffer_size, "OF_COMPATIBLE_N=%d", seen);
++length;
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
scratch += length;
envp[i++] = scratch;
length = scnprintf (scratch, buffer_size, "MODALIAS=%s",
soundbus_dev->modalias);
buffer_size -= length;
if ((buffer_size <= 0) || (i >= num_envp))
return -ENOMEM;
envp[i] = NULL;
return 0;
}
static int soundbus_device_remove(struct device *dev)
{
struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
if (dev->driver && drv->remove)
drv->remove(soundbus_dev);
soundbus_dev_put(soundbus_dev);
return 0;
}
static void soundbus_device_shutdown(struct device *dev)
{
struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
if (dev->driver && drv->shutdown)
drv->shutdown(soundbus_dev);
}
#ifdef CONFIG_PM
static int soundbus_device_suspend(struct device *dev, pm_message_t state)
{
struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
if (dev->driver && drv->suspend)
return drv->suspend(soundbus_dev, state);
return 0;
}
static int soundbus_device_resume(struct device * dev)
{
struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
if (dev->driver && drv->resume)
return drv->resume(soundbus_dev);
return 0;
}
#endif /* CONFIG_PM */
extern struct device_attribute soundbus_dev_attrs[];
static struct bus_type soundbus_bus_type = {
.name = "aoa-soundbus",
.probe = soundbus_probe,
.uevent = soundbus_uevent,
.remove = soundbus_device_remove,
.shutdown = soundbus_device_shutdown,
#ifdef CONFIG_PM
.suspend = soundbus_device_suspend,
.resume = soundbus_device_resume,
#endif
.dev_attrs = soundbus_dev_attrs,
};
static int __init soundbus_init(void)
{
return bus_register(&soundbus_bus_type);
}
static void __exit soundbus_exit(void)
{
bus_unregister(&soundbus_bus_type);
}
int soundbus_add_one(struct soundbus_dev *dev)
{
static int devcount;
/* sanity checks */
if (!dev->attach_codec ||
!dev->ofdev.node ||
dev->pcmname ||
dev->pcmid != -1) {
printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
return -EINVAL;
}
snprintf(dev->ofdev.dev.bus_id, BUS_ID_SIZE, "soundbus:%x", ++devcount);
dev->ofdev.dev.bus = &soundbus_bus_type;
return of_device_register(&dev->ofdev);
}
EXPORT_SYMBOL_GPL(soundbus_add_one);
void soundbus_remove_one(struct soundbus_dev *dev)
{
of_device_unregister(&dev->ofdev);
}
EXPORT_SYMBOL_GPL(soundbus_remove_one);
int soundbus_register_driver(struct soundbus_driver *drv)
{
/* initialize common driver fields */
drv->driver.name = drv->name;
drv->driver.bus = &soundbus_bus_type;
/* register with core */
return driver_register(&drv->driver);
}
EXPORT_SYMBOL_GPL(soundbus_register_driver);
void soundbus_unregister_driver(struct soundbus_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL_GPL(soundbus_unregister_driver);
module_init(soundbus_init);
module_exit(soundbus_exit);
|
