[DRIVER MODEL] Add platform_driver
Introduce struct platform_driver. This allows the platform device
driver methods to be passed a platform_device structure instead of
instead of a plain device structure, and therefore requiring casting
in every platform driver.
We introduce this in such a way that any existing platform drivers
registered directly via driver_register continue to work as before,
thereby allowing a gradual conversion to the new platform_driver
methods.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 6d4736e..8827daf 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -20,6 +20,8 @@
#include "base.h"
+#define to_platform_driver(drv) (container_of((drv), struct platform_driver, driver))
+
struct device platform_bus = {
.bus_id = "platform",
};
@@ -354,6 +356,77 @@
return ERR_PTR(retval);
}
+static int platform_drv_probe(struct device *_dev)
+{
+ struct platform_driver *drv = to_platform_driver(_dev->driver);
+ struct platform_device *dev = to_platform_device(_dev);
+
+ return drv->probe(dev);
+}
+
+static int platform_drv_remove(struct device *_dev)
+{
+ struct platform_driver *drv = to_platform_driver(_dev->driver);
+ struct platform_device *dev = to_platform_device(_dev);
+
+ return drv->remove(dev);
+}
+
+static void platform_drv_shutdown(struct device *_dev)
+{
+ struct platform_driver *drv = to_platform_driver(_dev->driver);
+ struct platform_device *dev = to_platform_device(_dev);
+
+ drv->shutdown(dev);
+}
+
+static int platform_drv_suspend(struct device *_dev, pm_message_t state)
+{
+ struct platform_driver *drv = to_platform_driver(_dev->driver);
+ struct platform_device *dev = to_platform_device(_dev);
+
+ return drv->suspend(dev, state);
+}
+
+static int platform_drv_resume(struct device *_dev)
+{
+ struct platform_driver *drv = to_platform_driver(_dev->driver);
+ struct platform_device *dev = to_platform_device(_dev);
+
+ return drv->resume(dev);
+}
+
+/**
+ * platform_driver_register
+ * @drv: platform driver structure
+ */
+int platform_driver_register(struct platform_driver *drv)
+{
+ drv->driver.bus = &platform_bus_type;
+ if (drv->probe)
+ drv->driver.probe = platform_drv_probe;
+ if (drv->remove)
+ drv->driver.remove = platform_drv_remove;
+ if (drv->shutdown)
+ drv->driver.shutdown = platform_drv_shutdown;
+ if (drv->suspend)
+ drv->driver.suspend = platform_drv_suspend;
+ if (drv->resume)
+ drv->driver.resume = platform_drv_resume;
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(platform_driver_register);
+
+/**
+ * platform_driver_unregister
+ * @drv: platform driver structure
+ */
+void platform_driver_unregister(struct platform_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL_GPL(platform_driver_unregister);
+
/**
* platform_match - bind platform device to platform driver.