[PATCH] swsusp: switch pm_message_t to struct
[linux-2.6.git] / arch / ppc / syslib / of_device.c
1 #include <linux/config.h>
2 #include <linux/string.h>
3 #include <linux/kernel.h>
4 #include <linux/init.h>
5 #include <linux/module.h>
6 #include <linux/mod_devicetable.h>
7 #include <asm/errno.h>
8 #include <asm/of_device.h>
9
10 /**
11  * of_match_device - Tell if an of_device structure has a matching
12  * of_match structure
13  * @ids: array of of device match structures to search in
14  * @dev: the of device structure to match against
15  *
16  * Used by a driver to check whether an of_device present in the
17  * system is in its list of supported devices.
18  */
19 const struct of_device_id * of_match_device(const struct of_device_id *matches,
20                                         const struct of_device *dev)
21 {
22         if (!dev->node)
23                 return NULL;
24         while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
25                 int match = 1;
26                 if (matches->name[0])
27                         match &= dev->node->name
28                                 && !strcmp(matches->name, dev->node->name);
29                 if (matches->type[0])
30                         match &= dev->node->type
31                                 && !strcmp(matches->type, dev->node->type);
32                 if (matches->compatible[0])
33                         match &= device_is_compatible(dev->node,
34                                 matches->compatible);
35                 if (match)
36                         return matches;
37                 matches++;
38         }
39         return NULL;
40 }
41
42 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
43 {
44         struct of_device * of_dev = to_of_device(dev);
45         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
46         const struct of_device_id * matches = of_drv->match_table;
47
48         if (!matches)
49                 return 0;
50
51         return of_match_device(matches, of_dev) != NULL;
52 }
53
54 struct of_device *of_dev_get(struct of_device *dev)
55 {
56         struct device *tmp;
57
58         if (!dev)
59                 return NULL;
60         tmp = get_device(&dev->dev);
61         if (tmp)
62                 return to_of_device(tmp);
63         else
64                 return NULL;
65 }
66
67 void of_dev_put(struct of_device *dev)
68 {
69         if (dev)
70                 put_device(&dev->dev);
71 }
72
73
74 static int of_device_probe(struct device *dev)
75 {
76         int error = -ENODEV;
77         struct of_platform_driver *drv;
78         struct of_device *of_dev;
79         const struct of_device_id *match;
80
81         drv = to_of_platform_driver(dev->driver);
82         of_dev = to_of_device(dev);
83
84         if (!drv->probe)
85                 return error;
86
87         of_dev_get(of_dev);
88
89         match = of_match_device(drv->match_table, of_dev);
90         if (match)
91                 error = drv->probe(of_dev, match);
92         if (error)
93                 of_dev_put(of_dev);
94
95         return error;
96 }
97
98 static int of_device_remove(struct device *dev)
99 {
100         struct of_device * of_dev = to_of_device(dev);
101         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
102
103         if (dev->driver && drv->remove)
104                 drv->remove(of_dev);
105         return 0;
106 }
107
108 static int of_device_suspend(struct device *dev, pm_message_t state)
109 {
110         struct of_device * of_dev = to_of_device(dev);
111         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
112         int error = 0;
113
114         if (dev->driver && drv->suspend)
115                 error = drv->suspend(of_dev, state);
116         return error;
117 }
118
119 static int of_device_resume(struct device * dev)
120 {
121         struct of_device * of_dev = to_of_device(dev);
122         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
123         int error = 0;
124
125         if (dev->driver && drv->resume)
126                 error = drv->resume(of_dev);
127         return error;
128 }
129
130 struct bus_type of_platform_bus_type = {
131        .name    = "of_platform",
132        .match   = of_platform_bus_match,
133        .suspend = of_device_suspend,
134        .resume  = of_device_resume,
135 };
136
137 static int __init of_bus_driver_init(void)
138 {
139         return bus_register(&of_platform_bus_type);
140 }
141
142 postcore_initcall(of_bus_driver_init);
143
144 int of_register_driver(struct of_platform_driver *drv)
145 {
146         int count = 0;
147
148         /* initialize common driver fields */
149         drv->driver.name = drv->name;
150         drv->driver.bus = &of_platform_bus_type;
151         drv->driver.probe = of_device_probe;
152         drv->driver.remove = of_device_remove;
153
154         /* register with core */
155         count = driver_register(&drv->driver);
156         return count ? count : 1;
157 }
158
159 void of_unregister_driver(struct of_platform_driver *drv)
160 {
161         driver_unregister(&drv->driver);
162 }
163
164
165 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
166 {
167         struct of_device *ofdev;
168
169         ofdev = to_of_device(dev);
170         return sprintf(buf, "%s", ofdev->node->full_name);
171 }
172
173 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
174
175 /**
176  * of_release_dev - free an of device structure when all users of it are finished.
177  * @dev: device that's been disconnected
178  *
179  * Will be called only by the device core when all users of this of device are
180  * done.
181  */
182 void of_release_dev(struct device *dev)
183 {
184         struct of_device *ofdev;
185
186         ofdev = to_of_device(dev);
187         of_node_put(ofdev->node);
188         kfree(ofdev);
189 }
190
191 int of_device_register(struct of_device *ofdev)
192 {
193         int rc;
194         struct of_device **odprop;
195
196         BUG_ON(ofdev->node == NULL);
197
198         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
199         if (!odprop) {
200                 struct property *new_prop;
201         
202                 new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *),
203                         GFP_KERNEL);
204                 if (new_prop == NULL)
205                         return -ENOMEM;
206                 new_prop->name = "linux,device";
207                 new_prop->length = sizeof(sizeof(struct of_device *));
208                 new_prop->value = (unsigned char *)&new_prop[1];
209                 odprop = (struct of_device **)new_prop->value;
210                 *odprop = NULL;
211                 prom_add_property(ofdev->node, new_prop);
212         }
213         *odprop = ofdev;
214
215         rc = device_register(&ofdev->dev);
216         if (rc)
217                 return rc;
218
219         device_create_file(&ofdev->dev, &dev_attr_devspec);
220
221         return 0;
222 }
223
224 void of_device_unregister(struct of_device *ofdev)
225 {
226         struct of_device **odprop;
227
228         device_remove_file(&ofdev->dev, &dev_attr_devspec);
229
230         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
231         if (odprop)
232                 *odprop = NULL;
233
234         device_unregister(&ofdev->dev);
235 }
236
237 struct of_device* of_platform_device_create(struct device_node *np, const char *bus_id)
238 {
239         struct of_device *dev;
240         u32 *reg;
241
242         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
243         if (!dev)
244                 return NULL;
245         memset(dev, 0, sizeof(*dev));
246
247         dev->node = of_node_get(np);
248         dev->dma_mask = 0xffffffffUL;
249         dev->dev.dma_mask = &dev->dma_mask;
250         dev->dev.parent = NULL;
251         dev->dev.bus = &of_platform_bus_type;
252         dev->dev.release = of_release_dev;
253
254         reg = (u32 *)get_property(np, "reg", NULL);
255         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
256
257         if (of_device_register(dev) != 0) {
258                 kfree(dev);
259                 return NULL;
260         }
261
262         return dev;
263 }
264
265 EXPORT_SYMBOL(of_match_device);
266 EXPORT_SYMBOL(of_platform_bus_type);
267 EXPORT_SYMBOL(of_register_driver);
268 EXPORT_SYMBOL(of_unregister_driver);
269 EXPORT_SYMBOL(of_device_register);
270 EXPORT_SYMBOL(of_device_unregister);
271 EXPORT_SYMBOL(of_dev_get);
272 EXPORT_SYMBOL(of_dev_put);
273 EXPORT_SYMBOL(of_platform_device_create);
274 EXPORT_SYMBOL(of_release_dev);