/* *  DIO Driver Services * *  Copyright (C) 2004 Jochen Friedrich * *  Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-driver.c * *  This file is subject to the terms and conditions of the GNU General Public *  License.  See the file COPYING in the main directory of this archive *  for more details. */ #include <linux/init.h>#include <linux/module.h>#include <linux/dio.h>  /** *  dio_match_device - Tell if a DIO device structure has a matching DIO device id structure *  @ids: array of DIO device id structures to search in *  @d: the DIO device structure to match against * *  Used by a driver to check whether a DIO device present in the *  system is in its list of supported devices. Returns the matching *  dio_device_id structure or %NULL if there is no match. */ static const struct dio_device_id *dio_match_device(const struct dio_device_id *ids,		   const struct dio_dev *d){	while (ids->id) {		if (ids->id == DIO_WILDCARD)			return ids;		if (DIO_NEEDSSECID(ids->id & 0xff)) {			if (ids->id == d->id)				return ids;		} else {			if ((ids->id & 0xff) == (d->id & 0xff))				return ids;		}		ids++;	}	return NULL;} static int dio_device_probe(struct device *dev){	int error = 0;	struct dio_driver *drv = to_dio_driver(dev->driver);	struct dio_dev *d = to_dio_dev(dev); 	if (!d->driver && drv->probe) {		const struct dio_device_id *id; 		id = dio_match_device(drv->id_table, d);		if (id)			error = drv->probe(d, id);		if (error >= 0) {			d->driver = drv;			error = 0;		}	}	return error;}  /** *  dio_register_driver - register a new DIO driver *  @drv: the driver structure to register * *  Adds the driver structure to the list of registered drivers *  Returns zero or a negative error value. */ int dio_register_driver(struct dio_driver *drv){	/* initialize common driver fields */	drv->driver.name = drv->name;	drv->driver.bus = &dio_bus_type; 	/* register with core */	return driver_register(&drv->driver);}  /** *  dio_unregister_driver - unregister a DIO driver *  @drv: the driver structure to unregister * *  Deletes the driver structure from the list of registered DIO drivers, *  gives it a chance to clean up by calling its remove() function for *  each device it was responsible for, and marks those devices as *  driverless. */ void dio_unregister_driver(struct dio_driver *drv){	driver_unregister(&drv->driver);}  /** *  dio_bus_match - Tell if a DIO device structure has a matching DIO device id structure *  @dev: the DIO device structure to match against *  @drv: the &device_driver that points to the array of DIO device id structures to search * *  Used by the driver core to check whether a DIO device present in the *  system is in a driver's list of supported devices. Returns 1 if supported, *  and 0 if there is no match. */ static int dio_bus_match(struct device *dev, const struct device_driver *drv){	struct dio_dev *d = to_dio_dev(dev);	const struct dio_driver *dio_drv = to_dio_driver(drv);	const struct dio_device_id *ids = dio_drv->id_table; 	if (!ids)		return 0; 	return dio_match_device(ids, d) ? 1 : 0;}  const struct bus_type dio_bus_type = {	.name	= "dio",	.match	= dio_bus_match,	.probe	= dio_device_probe,};  static int __init dio_driver_init(void){	return bus_register(&dio_bus_type);} postcore_initcall(dio_driver_init); EXPORT_SYMBOL(dio_register_driver);EXPORT_SYMBOL(dio_unregister_driver);EXPORT_SYMBOL(dio_bus_type);