[POWERPC] remove kernel module option for booke wdt
[linux-2.6.git] / sound / aoa / soundbus / core.c
1 /*
2  * soundbus
3  *
4  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
5  *
6  * GPL v2, can be found in COPYING.
7  */
8
9 #include <linux/module.h>
10 #include "soundbus.h"
11
12 MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
13 MODULE_LICENSE("GPL");
14 MODULE_DESCRIPTION("Apple Soundbus");
15
16 struct soundbus_dev *soundbus_dev_get(struct soundbus_dev *dev)
17 {
18         struct device *tmp;
19
20         if (!dev)
21                 return NULL;
22         tmp = get_device(&dev->ofdev.dev);
23         if (tmp)
24                 return to_soundbus_device(tmp);
25         else
26                 return NULL;
27 }
28 EXPORT_SYMBOL_GPL(soundbus_dev_get);
29
30 void soundbus_dev_put(struct soundbus_dev *dev)
31 {
32         if (dev)
33                 put_device(&dev->ofdev.dev);
34 }
35 EXPORT_SYMBOL_GPL(soundbus_dev_put);
36
37 static int soundbus_probe(struct device *dev)
38 {
39         int error = -ENODEV;
40         struct soundbus_driver *drv;
41         struct soundbus_dev *soundbus_dev;
42
43         drv = to_soundbus_driver(dev->driver);
44         soundbus_dev = to_soundbus_device(dev);
45
46         if (!drv->probe)
47                 return error;
48
49         soundbus_dev_get(soundbus_dev);
50
51         error = drv->probe(soundbus_dev);
52         if (error)
53                 soundbus_dev_put(soundbus_dev);
54
55         return error;
56 }
57
58
59 static int soundbus_uevent(struct device *dev, char **envp, int num_envp,
60                            char *buffer, int buffer_size)
61 {
62         struct soundbus_dev * soundbus_dev;
63         struct of_device * of;
64         char *scratch;
65         const char *compat;
66         int i = 0;
67         int length, cplen, seen = 0;
68
69         if (!dev)
70                 return -ENODEV;
71
72         soundbus_dev = to_soundbus_device(dev);
73         if (!soundbus_dev)
74                 return -ENODEV;
75
76         of = &soundbus_dev->ofdev;
77
78         /* stuff we want to pass to /sbin/hotplug */
79         envp[i++] = scratch = buffer;
80         length = scnprintf (scratch, buffer_size, "OF_NAME=%s", of->node->name);
81         ++length;
82         buffer_size -= length;
83         if ((buffer_size <= 0) || (i >= num_envp))
84                 return -ENOMEM;
85         scratch += length;
86
87         envp[i++] = scratch;
88         length = scnprintf (scratch, buffer_size, "OF_TYPE=%s", of->node->type);
89         ++length;
90         buffer_size -= length;
91         if ((buffer_size <= 0) || (i >= num_envp))
92                 return -ENOMEM;
93         scratch += length;
94
95         /* Since the compatible field can contain pretty much anything
96          * it's not really legal to split it out with commas. We split it
97          * up using a number of environment variables instead. */
98
99         compat = of_get_property(of->node, "compatible", &cplen);
100         while (compat && cplen > 0) {
101                 envp[i++] = scratch;
102                 length = scnprintf (scratch, buffer_size,
103                                      "OF_COMPATIBLE_%d=%s", seen, compat);
104                 ++length;
105                 buffer_size -= length;
106                 if ((buffer_size <= 0) || (i >= num_envp))
107                         return -ENOMEM;
108                 scratch += length;
109                 length = strlen (compat) + 1;
110                 compat += length;
111                 cplen -= length;
112                 seen++;
113         }
114
115         envp[i++] = scratch;
116         length = scnprintf (scratch, buffer_size, "OF_COMPATIBLE_N=%d", seen);
117         ++length;
118         buffer_size -= length;
119         if ((buffer_size <= 0) || (i >= num_envp))
120                 return -ENOMEM;
121         scratch += length;
122
123         envp[i++] = scratch;
124         length = scnprintf (scratch, buffer_size, "MODALIAS=%s",
125                         soundbus_dev->modalias);
126
127         buffer_size -= length;
128         if ((buffer_size <= 0) || (i >= num_envp))
129                 return -ENOMEM;
130
131         envp[i] = NULL;
132
133         return 0;
134 }
135
136 static int soundbus_device_remove(struct device *dev)
137 {
138         struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
139         struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
140
141         if (dev->driver && drv->remove)
142                 drv->remove(soundbus_dev);
143         soundbus_dev_put(soundbus_dev);
144
145         return 0;
146 }
147
148 static void soundbus_device_shutdown(struct device *dev)
149 {
150         struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
151         struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
152
153         if (dev->driver && drv->shutdown)
154                 drv->shutdown(soundbus_dev);
155 }
156
157 #ifdef CONFIG_PM
158
159 static int soundbus_device_suspend(struct device *dev, pm_message_t state)
160 {
161         struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
162         struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
163
164         if (dev->driver && drv->suspend)
165                 return drv->suspend(soundbus_dev, state);
166         return 0;
167 }
168
169 static int soundbus_device_resume(struct device * dev)
170 {
171         struct soundbus_dev * soundbus_dev = to_soundbus_device(dev);
172         struct soundbus_driver * drv = to_soundbus_driver(dev->driver);
173
174         if (dev->driver && drv->resume)
175                 return drv->resume(soundbus_dev);
176         return 0;
177 }
178
179 #endif /* CONFIG_PM */
180
181 extern struct device_attribute soundbus_dev_attrs[];
182
183 static struct bus_type soundbus_bus_type = {
184         .name           = "aoa-soundbus",
185         .probe          = soundbus_probe,
186         .uevent         = soundbus_uevent,
187         .remove         = soundbus_device_remove,
188         .shutdown       = soundbus_device_shutdown,
189 #ifdef CONFIG_PM
190         .suspend        = soundbus_device_suspend,
191         .resume         = soundbus_device_resume,
192 #endif
193         .dev_attrs      = soundbus_dev_attrs,
194 };
195
196 int soundbus_add_one(struct soundbus_dev *dev)
197 {
198         static int devcount;
199
200         /* sanity checks */
201         if (!dev->attach_codec ||
202             !dev->ofdev.node ||
203             dev->pcmname ||
204             dev->pcmid != -1) {
205                 printk(KERN_ERR "soundbus: adding device failed sanity check!\n");
206                 return -EINVAL;
207         }
208
209         snprintf(dev->ofdev.dev.bus_id, BUS_ID_SIZE, "soundbus:%x", ++devcount);
210         dev->ofdev.dev.bus = &soundbus_bus_type;
211         return of_device_register(&dev->ofdev);
212 }
213 EXPORT_SYMBOL_GPL(soundbus_add_one);
214
215 void soundbus_remove_one(struct soundbus_dev *dev)
216 {
217         of_device_unregister(&dev->ofdev);
218 }
219 EXPORT_SYMBOL_GPL(soundbus_remove_one);
220
221 int soundbus_register_driver(struct soundbus_driver *drv)
222 {
223         /* initialize common driver fields */
224         drv->driver.name = drv->name;
225         drv->driver.bus = &soundbus_bus_type;
226
227         /* register with core */
228         return driver_register(&drv->driver);
229 }
230 EXPORT_SYMBOL_GPL(soundbus_register_driver);
231
232 void soundbus_unregister_driver(struct soundbus_driver *drv)
233 {
234         driver_unregister(&drv->driver);
235 }
236 EXPORT_SYMBOL_GPL(soundbus_unregister_driver);
237
238 static int __init soundbus_init(void)
239 {
240         return bus_register(&soundbus_bus_type);
241 }
242
243 static void __exit soundbus_exit(void)
244 {
245         bus_unregister(&soundbus_bus_type);
246 }
247
248 subsys_initcall(soundbus_init);
249 module_exit(soundbus_exit);