platform: add new device registration helper

Add a helper that registers simple platform_device w/o resources but with
parent and device data.

This is usefull to cleanup platform code from code that registers such
simple devices as leds-gpio, generic-bl, etc.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index e621dade7eaa1dae63fec357aaa94fe661573222..9e60f7c739c6689a03651f7974d11a8c6818b40c 100644 (file)
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -391,6 +391,53 @@ error:
 }
 EXPORT_SYMBOL_GPL(platform_device_register_simple);
 
+/**
+ * platform_device_register_data
+ * @parent: parent device for the device we're adding
+ * @name: base name of the device we're adding
+ * @id: instance id
+ * @data: platform specific data for this platform device
+ * @size: size of platform specific data
+ *
+ * This function creates a simple platform device that requires minimal
+ * resource and memory management. Canned release function freeing memory
+ * allocated for the device allows drivers using such devices to be
+ * unloaded without waiting for the last reference to the device to be
+ * dropped.
+ */
+struct platform_device *platform_device_register_data(
+               struct device *parent,
+               const char *name, int id,
+               const void *data, size_t size)
+{
+       struct platform_device *pdev;
+       int retval;
+
+       pdev = platform_device_alloc(name, id);
+       if (!pdev) {
+               retval = -ENOMEM;
+               goto error;
+       }
+
+       pdev->dev.parent = parent;
+
+       if (size) {
+               retval = platform_device_add_data(pdev, data, size);
+               if (retval)
+                       goto error;
+       }
+
+       retval = platform_device_add(pdev);
+       if (retval)
+               goto error;
+
+       return pdev;
+
+error:
+       platform_device_put(pdev);
+       return ERR_PTR(retval);
+}
+
 static int platform_drv_probe(struct device *_dev)
 {
        struct platform_driver *drv = to_platform_driver(_dev->driver);

diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 95ac21ab3a092369f5f41537614eb9890161d70e..4b8cc6a324797682d08e487d314cb4ce647e2d7c 100644 (file)
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -37,6 +37,8 @@ extern int platform_add_devices(struct platform_device **, int);
 
 extern struct platform_device *platform_device_register_simple(const char *, int id,
                                        struct resource *, unsigned int);
+extern struct platform_device *platform_device_register_data(struct device *,
+               const char *, int, const void *, size_t);
 
 extern struct platform_device *platform_device_alloc(const char *name, int id);
 extern int platform_device_add_resources(struct platform_device *pdev, struct resource *res, unsigned int num);