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-rw-r--r--drivers/of/device.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/of/device.c b/drivers/of/device.c
new file mode 100644
index 000000000000..7f233d77d62f
--- /dev/null
+++ b/drivers/of/device.c
@@ -0,0 +1,131 @@
1#include <linux/string.h>
2#include <linux/kernel.h>
3#include <linux/of.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_node - Tell if an device_node has a matching of_match structure
14 * @ids: array of of device match structures to search in
15 * @node: the of device structure to match against
16 *
17 * Low level utility function used by device matching.
18 */
19const struct of_device_id *of_match_node(const struct of_device_id *matches,
20 const struct device_node *node)
21{
22 while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
23 int match = 1;
24 if (matches->name[0])
25 match &= node->name
26 && !strcmp(matches->name, node->name);
27 if (matches->type[0])
28 match &= node->type
29 && !strcmp(matches->type, node->type);
30 if (matches->compatible[0])
31 match &= of_device_is_compatible(node,
32 matches->compatible);
33 if (match)
34 return matches;
35 matches++;
36 }
37 return NULL;
38}
39EXPORT_SYMBOL(of_match_node);
40
41/**
42 * of_match_device - Tell if an of_device structure has a matching
43 * of_match structure
44 * @ids: array of of device match structures to search in
45 * @dev: the of device structure to match against
46 *
47 * Used by a driver to check whether an of_device present in the
48 * system is in its list of supported devices.
49 */
50const struct of_device_id *of_match_device(const struct of_device_id *matches,
51 const struct of_device *dev)
52{
53 if (!dev->node)
54 return NULL;
55 return of_match_node(matches, dev->node);
56}
57EXPORT_SYMBOL(of_match_device);
58
59struct of_device *of_dev_get(struct of_device *dev)
60{
61 struct device *tmp;
62
63 if (!dev)
64 return NULL;
65 tmp = get_device(&dev->dev);
66 if (tmp)
67 return to_of_device(tmp);
68 else
69 return NULL;
70}
71EXPORT_SYMBOL(of_dev_get);
72
73void of_dev_put(struct of_device *dev)
74{
75 if (dev)
76 put_device(&dev->dev);
77}
78EXPORT_SYMBOL(of_dev_put);
79
80static ssize_t dev_show_devspec(struct device *dev,
81 struct device_attribute *attr, char *buf)
82{
83 struct of_device *ofdev;
84
85 ofdev = to_of_device(dev);
86 return sprintf(buf, "%s", ofdev->node->full_name);
87}
88
89static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
90
91/**
92 * of_release_dev - free an of device structure when all users of it are finished.
93 * @dev: device that's been disconnected
94 *
95 * Will be called only by the device core when all users of this of device are
96 * done.
97 */
98void of_release_dev(struct device *dev)
99{
100 struct of_device *ofdev;
101
102 ofdev = to_of_device(dev);
103 of_node_put(ofdev->node);
104 kfree(ofdev);
105}
106EXPORT_SYMBOL(of_release_dev);
107
108int of_device_register(struct of_device *ofdev)
109{
110 int rc;
111
112 BUG_ON(ofdev->node == NULL);
113
114 rc = device_register(&ofdev->dev);
115 if (rc)
116 return rc;
117
118 rc = device_create_file(&ofdev->dev, &dev_attr_devspec);
119 if (rc)
120 device_unregister(&ofdev->dev);
121
122 return rc;
123}
124EXPORT_SYMBOL(of_device_register);
125
126void of_device_unregister(struct of_device *ofdev)
127{
128 device_remove_file(&ofdev->dev, &dev_attr_devspec);
129 device_unregister(&ofdev->dev);
130}
131EXPORT_SYMBOL(of_device_unregister);