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Subject[PATCH 37/46] platform: add new device registration helper
Date
From: Dmitry Baryshkov <dbaryshkov@gmail.com>

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>
---
drivers/base/platform.c | 47 +++++++++++++++++++++++++++++++++++++++
include/linux/platform_device.h | 2 +
2 files changed, 49 insertions(+), 0 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index e621dad..9e60f7c 100644
--- 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 95ac21a..4b8cc6a 100644
--- 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);
--
1.6.0.2


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