Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
[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        .suspend = of_device_suspend,
136        .resume  = of_device_resume,
137 };
138
139 static int __init of_bus_driver_init(void)
140 {
141         return bus_register(&of_platform_bus_type);
142 }
143
144 postcore_initcall(of_bus_driver_init);
145
146 int of_register_driver(struct of_platform_driver *drv)
147 {
148         int count = 0;
149
150         /* initialize common driver fields */
151         drv->driver.name = drv->name;
152         drv->driver.bus = &of_platform_bus_type;
153         drv->driver.probe = of_device_probe;
154         drv->driver.remove = of_device_remove;
155
156         /* register with core */
157         count = driver_register(&drv->driver);
158         return count ? count : 1;
159 }
160
161 void of_unregister_driver(struct of_platform_driver *drv)
162 {
163         driver_unregister(&drv->driver);
164 }
165
166
167 static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
168 {
169         struct of_device *ofdev;
170
171         ofdev = to_of_device(dev);
172         return sprintf(buf, "%s", ofdev->node->full_name);
173 }
174
175 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
176
177 /**
178  * of_release_dev - free an of device structure when all users of it are finished.
179  * @dev: device that's been disconnected
180  *
181  * Will be called only by the device core when all users of this of device are
182  * done.
183  */
184 void of_release_dev(struct device *dev)
185 {
186         struct of_device *ofdev;
187
188         ofdev = to_of_device(dev);
189         of_node_put(ofdev->node);
190         kfree(ofdev);
191 }
192
193 int of_device_register(struct of_device *ofdev)
194 {
195         int rc;
196         struct of_device **odprop;
197
198         BUG_ON(ofdev->node == NULL);
199
200         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
201         if (!odprop) {
202                 struct property *new_prop;
203         
204                 new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *),
205                         GFP_KERNEL);
206                 if (new_prop == NULL)
207                         return -ENOMEM;
208                 new_prop->name = "linux,device";
209                 new_prop->length = sizeof(sizeof(struct of_device *));
210                 new_prop->value = (unsigned char *)&new_prop[1];
211                 odprop = (struct of_device **)new_prop->value;
212                 *odprop = NULL;
213                 prom_add_property(ofdev->node, new_prop);
214         }
215         *odprop = ofdev;
216
217         rc = device_register(&ofdev->dev);
218         if (rc)
219                 return rc;
220
221         device_create_file(&ofdev->dev, &dev_attr_devspec);
222
223         return 0;
224 }
225
226 void of_device_unregister(struct of_device *ofdev)
227 {
228         struct of_device **odprop;
229
230         device_remove_file(&ofdev->dev, &dev_attr_devspec);
231
232         odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
233         if (odprop)
234                 *odprop = NULL;
235
236         device_unregister(&ofdev->dev);
237 }
238
239 struct of_device* of_platform_device_create(struct device_node *np,
240                                             const char *bus_id,
241                                             struct device *parent)
242 {
243         struct of_device *dev;
244
245         dev = kmalloc(sizeof(*dev), GFP_KERNEL);
246         if (!dev)
247                 return NULL;
248         memset(dev, 0, sizeof(*dev));
249
250         dev->node = of_node_get(np);
251         dev->dma_mask = 0xffffffffUL;
252         dev->dev.dma_mask = &dev->dma_mask;
253         dev->dev.parent = parent;
254         dev->dev.bus = &of_platform_bus_type;
255         dev->dev.release = of_release_dev;
256
257         strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
258
259         if (of_device_register(dev) != 0) {
260                 kfree(dev);
261                 return NULL;
262         }
263
264         return dev;
265 }
266
267 EXPORT_SYMBOL(of_match_device);
268 EXPORT_SYMBOL(of_platform_bus_type);
269 EXPORT_SYMBOL(of_register_driver);
270 EXPORT_SYMBOL(of_unregister_driver);
271 EXPORT_SYMBOL(of_device_register);
272 EXPORT_SYMBOL(of_device_unregister);
273 EXPORT_SYMBOL(of_dev_get);
274 EXPORT_SYMBOL(of_dev_put);
275 EXPORT_SYMBOL(of_platform_device_create);
276 EXPORT_SYMBOL(of_release_dev);