forked from Minki/linux
283029d16a
Similar to of_find_compatible_node(), of_find_matching_node() and for_each_matching_node() allow you to iterate over the device tree looking for specific nodes, except that they take of_device_id tables instead of strings. This also moves of_match_node() from driver/of/device.c to driver/of/base.c to colocate it with the of_find_matching_node which depends on it. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Paul Mackerras <paulus@samba.org>
103 lines
2.2 KiB
C
103 lines
2.2 KiB
C
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/errno.h>
|
|
|
|
/**
|
|
* of_match_device - Tell if an of_device structure has a matching
|
|
* of_match structure
|
|
* @ids: array of of device match structures to search in
|
|
* @dev: the of device structure to match against
|
|
*
|
|
* Used by a driver to check whether an of_device present in the
|
|
* system is in its list of supported devices.
|
|
*/
|
|
const struct of_device_id *of_match_device(const struct of_device_id *matches,
|
|
const struct of_device *dev)
|
|
{
|
|
if (!dev->node)
|
|
return NULL;
|
|
return of_match_node(matches, dev->node);
|
|
}
|
|
EXPORT_SYMBOL(of_match_device);
|
|
|
|
struct of_device *of_dev_get(struct of_device *dev)
|
|
{
|
|
struct device *tmp;
|
|
|
|
if (!dev)
|
|
return NULL;
|
|
tmp = get_device(&dev->dev);
|
|
if (tmp)
|
|
return to_of_device(tmp);
|
|
else
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(of_dev_get);
|
|
|
|
void of_dev_put(struct of_device *dev)
|
|
{
|
|
if (dev)
|
|
put_device(&dev->dev);
|
|
}
|
|
EXPORT_SYMBOL(of_dev_put);
|
|
|
|
static ssize_t dev_show_devspec(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct of_device *ofdev;
|
|
|
|
ofdev = to_of_device(dev);
|
|
return sprintf(buf, "%s", ofdev->node->full_name);
|
|
}
|
|
|
|
static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
|
|
|
|
/**
|
|
* of_release_dev - free an of device structure when all users of it are finished.
|
|
* @dev: device that's been disconnected
|
|
*
|
|
* Will be called only by the device core when all users of this of device are
|
|
* done.
|
|
*/
|
|
void of_release_dev(struct device *dev)
|
|
{
|
|
struct of_device *ofdev;
|
|
|
|
ofdev = to_of_device(dev);
|
|
of_node_put(ofdev->node);
|
|
kfree(ofdev);
|
|
}
|
|
EXPORT_SYMBOL(of_release_dev);
|
|
|
|
int of_device_register(struct of_device *ofdev)
|
|
{
|
|
int rc;
|
|
|
|
BUG_ON(ofdev->node == NULL);
|
|
|
|
rc = device_register(&ofdev->dev);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = device_create_file(&ofdev->dev, &dev_attr_devspec);
|
|
if (rc)
|
|
device_unregister(&ofdev->dev);
|
|
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(of_device_register);
|
|
|
|
void of_device_unregister(struct of_device *ofdev)
|
|
{
|
|
device_remove_file(&ofdev->dev, &dev_attr_devspec);
|
|
device_unregister(&ofdev->dev);
|
|
}
|
|
EXPORT_SYMBOL(of_device_unregister);
|