Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <linux/string.h>
2#include <linux/kernel.h>
3#include <linux/of.h>
4#include <linux/of_device.h>
5#include <linux/init.h>
6#include <linux/module.h>
7#include <linux/mod_devicetable.h>
8#include <linux/slab.h>
9
10#include <asm/errno.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 */
21const 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 return of_match_node(matches, dev->node);
27}
28EXPORT_SYMBOL(of_match_device);
29
30struct of_device *of_dev_get(struct of_device *dev)
31{
32 struct device *tmp;
33
34 if (!dev)
35 return NULL;
36 tmp = get_device(&dev->dev);
37 if (tmp)
38 return to_of_device(tmp);
39 else
40 return NULL;
41}
42EXPORT_SYMBOL(of_dev_get);
43
44void of_dev_put(struct of_device *dev)
45{
46 if (dev)
47 put_device(&dev->dev);
48}
49EXPORT_SYMBOL(of_dev_put);
50
51static ssize_t dev_show_devspec(struct device *dev,
52 struct device_attribute *attr, char *buf)
53{
54 struct of_device *ofdev;
55
56 ofdev = to_of_device(dev);
57 return sprintf(buf, "%s", ofdev->node->full_name);
58}
59
60static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
61
62/**
63 * of_release_dev - free an of device structure when all users of it are finished.
64 * @dev: device that's been disconnected
65 *
66 * Will be called only by the device core when all users of this of device are
67 * done.
68 */
69void of_release_dev(struct device *dev)
70{
71 struct of_device *ofdev;
72
73 ofdev = to_of_device(dev);
74 of_node_put(ofdev->node);
75 kfree(ofdev);
76}
77EXPORT_SYMBOL(of_release_dev);
78
79int of_device_register(struct of_device *ofdev)
80{
81 int rc;
82
83 BUG_ON(ofdev->node == NULL);
84
85 rc = device_register(&ofdev->dev);
86 if (rc)
87 return rc;
88
89 rc = device_create_file(&ofdev->dev, &dev_attr_devspec);
90 if (rc)
91 device_unregister(&ofdev->dev);
92
93 return rc;
94}
95EXPORT_SYMBOL(of_device_register);
96
97void of_device_unregister(struct of_device *ofdev)
98{
99 device_remove_file(&ofdev->dev, &dev_attr_devspec);
100 device_unregister(&ofdev->dev);
101}
102EXPORT_SYMBOL(of_device_unregister);