Begin to consolidate of_device.c

This moves all the common parts for the Sparc, Sparc64 and PowerPC
of_device.c files into drivers/of/device.c.

Apart from the simple move, Sparc gains of_match_node() and a call to
of_node_put in of_release_dev().  PowerPC gains better recovery if
device_create_file() fails in of_device_register().

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Acked-by: Paul Mackerras <paulus@samba.org>
Acked-by: David S. Miller <davem@davemloft.net>

3 files changed, 135 insertions, 0 deletions

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
new file mode 100644
index 000000000000..c03072b12f42
--- /dev/null
+++ b/drivers/of/Kconfig
@@ -0,0 +1,3 @@
+config OF_DEVICE
+        def_bool y
+        depends on OF && (SPARC || PPC_OF)
diff --git a/drivers/of/Makefile b/drivers/of/Makefile
index cddbe840e30a..c46d998e367b 100644
--- a/drivers/of/Makefile
+++ b/drivers/of/Makefile
@@ -1 +1,2 @@
 obj-y = base.o
+obj-$(CONFIG_OF_DEVICE) += device.o
diff --git a/drivers/of/device.c b/drivers/of/device.c
new file mode 100644
index 000000000000..7f233d77d62f
--- /dev/null
+++ b/drivers/of/device.c
@@ -0,0 +1,131 @@
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/slab.h>
+
+#include <asm/errno.h>
+#include <asm/of_device.h>
+
+/**
+ * of_match_node - Tell if an device_node has a matching of_match structure
+ * @ids: array of of device match structures to search in
+ * @node: the of device structure to match against
+ *
+ * Low level utility function used by device matching.
+ */
+const struct of_device_id *of_match_node(const struct of_device_id *matches,
+                                         const struct device_node *node)
+{
+        while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
+                int match = 1;
+                if (matches->name[0])
+                        match &= node->name
+                                && !strcmp(matches->name, node->name);
+                if (matches->type[0])
+                        match &= node->type
+                                && !strcmp(matches->type, node->type);
+                if (matches->compatible[0])
+                        match &= of_device_is_compatible(node,
+                                                matches->compatible);
+                if (match)
+                        return matches;
+                matches++;
+        }
+        return NULL;
+}
+EXPORT_SYMBOL(of_match_node);
+
+/**
+ * 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);