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[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>
hifive-unleashed-5.1
Russell King 2005-11-09 17:23:39 +00:00 committed by Russell King
parent 330d57fb98
commit 00d3dcdd96
2 changed files with 88 additions and 0 deletions
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73
drivers/base/platform.c
View File

@ -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.

15
include/linux/platform_device.h
View File

@ -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_ */