[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>

2 files changed, 88 insertions, 0 deletions

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 6d4736e89f1a..8827dafba945 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 @@ error:
         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.
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index 1a165b7ae01b..17e336f40b47 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -43,4 +43,19 @@ extern int platform_device_add_data(struct platform_device *pdev, void *data, si
 extern int platform_device_add(struct platform_device *pdev);
 extern void platform_device_put(struct platform_device *pdev);
 
+struct platform_driver {
+        int (*probe)(struct platform_device *);
+        int (*remove)(struct platform_device *);
+        void (*shutdown)(struct platform_device *);
+        int (*suspend)(struct platform_device *, pm_message_t state);
+        int (*resume)(struct platform_device *);
+        struct device_driver driver;
+};
+
+extern int platform_driver_register(struct platform_driver *);
+extern void platform_driver_unregister(struct platform_driver *);
+
+#define platform_get_drvdata(_dev)      dev_get_drvdata(&(_dev)->dev)
+#define platform_set_drvdata(_dev,data) dev_set_drvdata(&(_dev)->dev, (data))
+
 #endif /* _PLATFORM_DEVICE_H_ */