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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
7eebde700f
This patch first splits of_device.c and of_platform.c, the later containing the bits relative to of_platform_device's. On the "breaks" side of things, drivers uisng of_platform_device(s) need to include asm/of_platform.h now and of_(un)register_driver is now of_(un)register_platform_driver. In addition to a few utility functions to locate of_platform_device(s), the main new addition is of_platform_bus_probe() which allows the platform code to trigger an automatic creation of of_platform_devices for a whole tree of devices. The function acts based on the type of the various "parent" devices encountered from a provided root, using either a default known list of bus types that can be "probed" or a passed-in list. It will only register devices on busses matching that list, which mean that typically, it will not register PCI devices, as expected (since they will be picked up by the PCI layer). This will be used by Cell platforms using 4xx-type IOs in the Axon bridge and can be used by any embedded-type device as well. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
131 lines
2.9 KiB
C
131 lines
2.9 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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device_create_file(&ofdev->dev, &dev_attr_devspec);
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return 0;
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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_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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