Pull bugzilla-5653 into release branch
[linux-2.6] / arch / powerpc / kernel / 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 <linux/slab.h>
8
9 #include <asm/errno.h>
10 #include <asm/of_device.h>
11
12 /**
13  * of_match_device - Tell if an of_device structure has a matching
14  * of_match structure
15  * @ids: array of of device match structures to search in
16  * @dev: the of device structure to match against
17  *
18  * Used by a driver to check whether an of_device present in the
19  * system is in its list of supported devices.
20  */
21 const struct of_device_id *of_match_device(const struct of_device_id *matches,
22                                         const struct of_device *dev)
23 {
24         if (!dev->node)
25                 return NULL;
26         while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
27                 int match = 1;
28                 if (matches->name[0])
29                         match &= dev->node->name
30                                 && !strcmp(matches->name, dev->node->name);
31                 if (matches->type[0])
32                         match &= dev->node->type
33                                 && !strcmp(matches->type, dev->node->type);
34                 if (matches->compatible[0])
35                         match &= device_is_compatible(dev->node,
36                                 matches->compatible);
37                 if (match)
38                         return matches;
39                 matches++;
40         }
41         return NULL;
42 }
43
44 static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
45 {
46         struct of_device * of_dev = to_of_device(dev);
47         struct of_platform_driver * of_drv = to_of_platform_driver(drv);
48         const struct of_device_id * matches = of_drv->match_table;
49
50         if (!matches)
51                 return 0;
52
53         return of_match_device(matches, of_dev) != NULL;
54 }
55
56 struct of_device *of_dev_get(struct of_device *dev)
57 {
58         struct device *tmp;
59
60         if (!dev)
61                 return NULL;
62         tmp = get_device(&dev->dev);
63         if (tmp)
64                 return to_of_device(tmp);
65         else
66                 return NULL;
67 }
68
69 void of_dev_put(struct of_device *dev)
70 {
71         if (dev)
72                 put_device(&dev->dev);
73 }
74
75
76 static int of_device_probe(struct device *dev)
77 {
78         int error = -ENODEV;
79         struct of_platform_driver *drv;
80         struct of_device *of_dev;
81         const struct of_device_id *match;
82
83         drv = to_of_platform_driver(dev->driver);
84         of_dev = to_of_device(dev);
85
86         if (!drv->probe)
87                 return error;
88
89         of_dev_get(of_dev);
90
91         match = of_match_device(drv->match_table, of_dev);
92         if (match)
93                 error = drv->probe(of_dev, match);
94         if (error)
95                 of_dev_put(of_dev);
96
97         return error;
98 }
99
100 static int of_device_remove(struct device *dev)
101 {
102         struct of_device * of_dev = to_of_device(dev);
103         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
104
105         if (dev->driver && drv->remove)
106                 drv->remove(of_dev);
107         return 0;
108 }
109
110 static int of_device_suspend(struct device *dev, pm_message_t state)
111 {
112         struct of_device * of_dev = to_of_device(dev);
113         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
114         int error = 0;
115
116         if (dev->driver && drv->suspend)
117                 error = drv->suspend(of_dev, state);
118         return error;
119 }
120
121 static int of_device_resume(struct device * dev)
122 {
123         struct of_device * of_dev = to_of_device(dev);
124         struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
125         int error = 0;
126
127         if (dev->driver && drv->resume)
128                 error = drv->resume(of_dev);
129         return error;
130 }
131
132 struct bus_type of_platform_bus_type = {
133        .name    = "of_platform",
134        .match   = of_platform_bus_match,
135        .probe   = of_device_probe,
136        .remove  = of_device_remove,
137        .suspend = of_device_suspend,
138        .resume  = of_device_resume,
139 };
140
141 static int __init of_bus_driver_init(void)
142 {
143         return bus_register(&of_platform_bus_type);
144 }
145
146 postcore_initcall(of_bus_driver_init);
147
148 int of_register_driver(struct of_platform_driver *drv)
149 {
150         /* initialize common driver fields */
151         drv->driver.name = drv->name;
152         drv->driver.bus = &of_platform_bus_type;
153
154         /* register with core */
155         return driver_register(&drv->driver);
156 }
157
158 void of_unregister_driver(struct of_platform_driver *drv)
159 {
160         driver_unregister(&drv->driver);
161 }
162
163
164 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
165 {
166         struct of_device *ofdev;
167
168         ofdev = to_of_device(dev);
169         return sprintf(buf, "%s", ofdev->node->full_name);
170 }
171
172 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
173
174 /**
175  * of_release_dev - free an of device structure when all users of it are finished.
176  * @dev: device that's been disconnected
177  *
178  * Will be called only by the device core when all users of this of device are
179  * done.
180  */
181 void of_release_dev(struct device *dev)
182 {
183         struct of_device *ofdev;
184
185         ofdev = to_of_device(dev);
186         of_node_put(ofdev->node);
187         kfree(ofdev);
188 }
189
190 int of_device_register(struct of_device *ofdev)
191 {
192         int rc;
193         struct of_device **odprop;
194
195         BUG_ON(ofdev->node == NULL);
196
197         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
198         if (!odprop) {
199                 struct property *new_prop;
200         
201                 new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *),
202                         GFP_KERNEL);
203                 if (new_prop == NULL)
204                         return -ENOMEM;
205                 new_prop->name = "linux,device";
206                 new_prop->length = sizeof(sizeof(struct of_device *));
207                 new_prop->value = (unsigned char *)&new_prop[1];
208                 odprop = (struct of_device **)new_prop->value;
209                 *odprop = NULL;
210                 prom_add_property(ofdev->node, new_prop);
211         }
212         *odprop = ofdev;
213
214         rc = device_register(&ofdev->dev);
215         if (rc)
216                 return rc;
217
218         device_create_file(&ofdev->dev, &dev_attr_devspec);
219
220         return 0;
221 }
222
223 void of_device_unregister(struct of_device *ofdev)
224 {
225         struct of_device **odprop;
226
227         device_remove_file(&ofdev->dev, &dev_attr_devspec);
228
229         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
230         if (odprop)
231                 *odprop = NULL;
232
233         device_unregister(&ofdev->dev);
234 }
235
236 struct of_device* of_platform_device_create(struct device_node *np,
237                                             const char *bus_id,
238                                             struct device *parent)
239 {
240         struct of_device *dev;
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 = parent;
251         dev->dev.bus = &of_platform_bus_type;
252         dev->dev.release = of_release_dev;
253
254         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
255
256         if (of_device_register(dev) != 0) {
257                 kfree(dev);
258                 return NULL;
259         }
260
261         return dev;
262 }
263
264 EXPORT_SYMBOL(of_match_device);
265 EXPORT_SYMBOL(of_platform_bus_type);
266 EXPORT_SYMBOL(of_register_driver);
267 EXPORT_SYMBOL(of_unregister_driver);
268 EXPORT_SYMBOL(of_device_register);
269 EXPORT_SYMBOL(of_device_unregister);
270 EXPORT_SYMBOL(of_dev_get);
271 EXPORT_SYMBOL(of_dev_put);
272 EXPORT_SYMBOL(of_platform_device_create);
273 EXPORT_SYMBOL(of_release_dev);