130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/slab.h>
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#include <asm/errno.h>
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#include <asm/of_device.h>
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/**
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* of_match_node - Tell if an device_node has a matching of_match structure
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* @ids: array of of device match structures to search in
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* @node: the of device structure to match against
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*
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* Low level utility function used by device matching.
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*/
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const struct of_device_id *of_match_node(const struct of_device_id *matches,
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const struct device_node *node)
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{
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while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
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int match = 1;
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if (matches->name[0])
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match &= node->name
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&& !strcmp(matches->name, node->name);
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if (matches->type[0])
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match &= node->type
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&& !strcmp(matches->type, node->type);
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if (matches->compatible[0])
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match &= device_is_compatible(node,
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matches->compatible);
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if (match)
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return matches;
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matches++;
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}
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return NULL;
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}
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/**
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* of_match_device - Tell if an of_device structure has a matching
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* of_match structure
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* @ids: array of of device match structures to search in
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* @dev: the of device structure to match against
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*
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* Used by a driver to check whether an of_device present in the
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* system is in its list of supported devices.
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*/
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const struct of_device_id *of_match_device(const struct of_device_id *matches,
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const struct of_device *dev)
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{
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if (!dev->node)
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return NULL;
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return of_match_node(matches, dev->node);
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}
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struct of_device *of_dev_get(struct of_device *dev)
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{
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struct device *tmp;
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if (!dev)
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return NULL;
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tmp = get_device(&dev->dev);
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if (tmp)
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return to_of_device(tmp);
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else
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return NULL;
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}
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void of_dev_put(struct of_device *dev)
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{
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if (dev)
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put_device(&dev->dev);
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}
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static ssize_t dev_show_devspec(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct of_device *ofdev;
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ofdev = to_of_device(dev);
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return sprintf(buf, "%s", ofdev->node->full_name);
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}
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static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
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/**
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* of_release_dev - free an of device structure when all users of it are finished.
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* @dev: device that's been disconnected
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*
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* Will be called only by the device core when all users of this of device are
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* done.
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*/
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void of_release_dev(struct device *dev)
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{
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struct of_device *ofdev;
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ofdev = to_of_device(dev);
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of_node_put(ofdev->node);
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kfree(ofdev);
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}
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int of_device_register(struct of_device *ofdev)
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{
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int rc;
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BUG_ON(ofdev->node == NULL);
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rc = device_register(&ofdev->dev);
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if (rc)
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return rc;
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return device_create_file(&ofdev->dev, &dev_attr_devspec);
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}
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void of_device_unregister(struct of_device *ofdev)
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{
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device_remove_file(&ofdev->dev, &dev_attr_devspec);
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device_unregister(&ofdev->dev);
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}
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EXPORT_SYMBOL(of_match_node);
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EXPORT_SYMBOL(of_match_device);
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EXPORT_SYMBOL(of_device_register);
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EXPORT_SYMBOL(of_device_unregister);
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EXPORT_SYMBOL(of_dev_get);
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EXPORT_SYMBOL(of_dev_put);
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EXPORT_SYMBOL(of_release_dev);
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