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@@ -0,0 +1,268 @@
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+#include <linux/config.h>
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+#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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+
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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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+/**
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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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+ 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 &= dev->node->name
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+ && !strcmp(matches->name, dev->node->name);
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+ if (matches->type[0])
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+ match &= dev->node->type
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+ && !strcmp(matches->type, dev->node->type);
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+ if (matches->compatible[0])
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+ match &= of_device_is_compatible(dev->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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+static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
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+{
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+ struct of_device * of_dev = to_of_device(dev);
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+ struct of_platform_driver * of_drv = to_of_platform_driver(drv);
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+ const struct of_device_id * matches = of_drv->match_table;
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+
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+ if (!matches)
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+ return 0;
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+
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+ return of_match_device(matches, of_dev) != NULL;
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+}
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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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+
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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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+
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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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+
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+
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+static int of_device_probe(struct device *dev)
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+{
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+ int error = -ENODEV;
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+ struct of_platform_driver *drv;
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+ struct of_device *of_dev;
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+ const struct of_device_id *match;
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+
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+ drv = to_of_platform_driver(dev->driver);
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+ of_dev = to_of_device(dev);
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+
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+ if (!drv->probe)
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+ return error;
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+
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+ of_dev_get(of_dev);
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+
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+ match = of_match_device(drv->match_table, of_dev);
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+ if (match)
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+ error = drv->probe(of_dev, match);
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+ if (error)
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+ of_dev_put(of_dev);
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+
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+ return error;
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+}
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+
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+static int of_device_remove(struct device *dev)
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+{
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+ struct of_device * of_dev = to_of_device(dev);
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+ struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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+
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+ if (dev->driver && drv->remove)
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+ drv->remove(of_dev);
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+ return 0;
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+}
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+
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+static int of_device_suspend(struct device *dev, pm_message_t state)
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+{
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+ struct of_device * of_dev = to_of_device(dev);
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+ struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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+ int error = 0;
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+
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+ if (dev->driver && drv->suspend)
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+ error = drv->suspend(of_dev, state);
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+ return error;
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+}
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+
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+static int of_device_resume(struct device * dev)
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+{
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+ struct of_device * of_dev = to_of_device(dev);
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+ struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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+ int error = 0;
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+
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+ if (dev->driver && drv->resume)
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+ error = drv->resume(of_dev);
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+ return error;
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+}
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+
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+#ifdef CONFIG_PCI
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+struct bus_type ebus_bus_type = {
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+ .name = "ebus",
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+ .match = of_platform_bus_match,
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+ .probe = of_device_probe,
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+ .remove = of_device_remove,
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+ .suspend = of_device_suspend,
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+ .resume = of_device_resume,
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+};
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+#endif
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+
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+#ifdef CONFIG_SBUS
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+struct bus_type sbus_bus_type = {
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+ .name = "sbus",
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+ .match = of_platform_bus_match,
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+ .probe = of_device_probe,
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+ .remove = of_device_remove,
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+ .suspend = of_device_suspend,
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+ .resume = of_device_resume,
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+};
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+#endif
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+
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+static int __init of_bus_driver_init(void)
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+{
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+ int err = 0;
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+
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+#ifdef CONFIG_PCI
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+ if (!err)
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+ err = bus_register(&ebus_bus_type);
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+#endif
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+#ifdef CONFIG_SBUS
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+ if (!err)
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+ err = bus_register(&sbus_bus_type);
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+#endif
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+ return 0;
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+}
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+
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+postcore_initcall(of_bus_driver_init);
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+
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+int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus)
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+{
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+ /* initialize common driver fields */
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+ drv->driver.name = drv->name;
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+ drv->driver.bus = bus;
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+
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+ /* register with core */
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+ return driver_register(&drv->driver);
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+}
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+
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+void of_unregister_driver(struct of_platform_driver *drv)
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+{
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+ driver_unregister(&drv->driver);
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+}
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+
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+
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+static ssize_t dev_show_devspec(struct device *dev, struct device_attribute *attr, char *buf)
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+{
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+ struct of_device *ofdev;
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+
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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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+
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+static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
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+
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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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+
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+ ofdev = to_of_device(dev);
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+
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+ kfree(ofdev);
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+}
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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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+
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+ BUG_ON(ofdev->node == NULL);
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+
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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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+
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+ device_create_file(&ofdev->dev, &dev_attr_devspec);
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+
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+ return 0;
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+}
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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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+
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+struct of_device* of_platform_device_create(struct device_node *np,
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+ const char *bus_id,
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+ struct device *parent,
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+ struct bus_type *bus)
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+{
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+ struct of_device *dev;
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+
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+ dev = kmalloc(sizeof(*dev), GFP_KERNEL);
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+ if (!dev)
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+ return NULL;
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+ memset(dev, 0, sizeof(*dev));
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+
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+ dev->dev.parent = parent;
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+ dev->dev.bus = bus;
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+ dev->dev.release = of_release_dev;
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+
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+ strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
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+
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+ if (of_device_register(dev) != 0) {
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+ kfree(dev);
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+ return NULL;
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+ }
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+
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+ return dev;
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+}
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+
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+EXPORT_SYMBOL(of_match_device);
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+EXPORT_SYMBOL(of_register_driver);
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+EXPORT_SYMBOL(of_unregister_driver);
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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_platform_device_create);
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+EXPORT_SYMBOL(of_release_dev);
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David S. Miller