Merge branch 'intx' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/misc-2.6
[linux-2.6] / arch / powerpc / kernel / of_device.c
1 #include <linux/string.h>
2 #include <linux/kernel.h>
3 #include <linux/init.h>
4 #include <linux/module.h>
5 #include <linux/mod_devicetable.h>
6 #include <linux/slab.h>
7
8 #include <asm/errno.h>
9 #include <asm/of_device.h>
10
11 /**
12  * of_match_node - Tell if an device_node has a matching of_match structure
13  * @ids: array of of device match structures to search in
14  * @node: the of device structure to match against
15  *
16  * Low level utility function used by device matching.
17  */
18 const struct of_device_id *of_match_node(const struct of_device_id *matches,
19                                          const struct device_node *node)
20 {
21         while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
22                 int match = 1;
23                 if (matches->name[0])
24                         match &= node->name
25                                 && !strcmp(matches->name, node->name);
26                 if (matches->type[0])
27                         match &= node->type
28                                 && !strcmp(matches->type, node->type);
29                 if (matches->compatible[0])
30                         match &= device_is_compatible(node,
31                                                       matches->compatible);
32                 if (match)
33                         return matches;
34                 matches++;
35         }
36         return NULL;
37 }
38
39 /**
40  * of_match_device - Tell if an of_device structure has a matching
41  * of_match structure
42  * @ids: array of of device match structures to search in
43  * @dev: the of device structure to match against
44  *
45  * Used by a driver to check whether an of_device present in the
46  * system is in its list of supported devices.
47  */
48 const struct of_device_id *of_match_device(const struct of_device_id *matches,
49                                         const struct of_device *dev)
50 {
51         if (!dev->node)
52                 return NULL;
53         return of_match_node(matches, dev->node);
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 static ssize_t dev_show_devspec(struct device *dev,
76                                 struct device_attribute *attr, char *buf)
77 {
78         struct of_device *ofdev;
79
80         ofdev = to_of_device(dev);
81         return sprintf(buf, "%s", ofdev->node->full_name);
82 }
83
84 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
85
86 /**
87  * of_release_dev - free an of device structure when all users of it are finished.
88  * @dev: device that's been disconnected
89  *
90  * Will be called only by the device core when all users of this of device are
91  * done.
92  */
93 void of_release_dev(struct device *dev)
94 {
95         struct of_device *ofdev;
96
97         ofdev = to_of_device(dev);
98         of_node_put(ofdev->node);
99         kfree(ofdev);
100 }
101
102 int of_device_register(struct of_device *ofdev)
103 {
104         int rc;
105
106         BUG_ON(ofdev->node == NULL);
107
108         rc = device_register(&ofdev->dev);
109         if (rc)
110                 return rc;
111
112         device_create_file(&ofdev->dev, &dev_attr_devspec);
113
114         return 0;
115 }
116
117 void of_device_unregister(struct of_device *ofdev)
118 {
119         device_remove_file(&ofdev->dev, &dev_attr_devspec);
120
121         device_unregister(&ofdev->dev);
122 }
123
124
125 EXPORT_SYMBOL(of_match_node);
126 EXPORT_SYMBOL(of_match_device);
127 EXPORT_SYMBOL(of_device_register);
128 EXPORT_SYMBOL(of_device_unregister);
129 EXPORT_SYMBOL(of_dev_get);
130 EXPORT_SYMBOL(of_dev_put);
131 EXPORT_SYMBOL(of_release_dev);