?? dio-driver.c
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/* * 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 * @dev: 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. */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 * @ids: array of DIO device id structures to search in * @dev: 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 int dio_bus_match(struct device *dev, struct device_driver *drv){ struct dio_dev *d = to_dio_dev(dev); struct dio_driver *dio_drv = to_dio_driver(drv); const struct dio_device_id *ids = dio_drv->id_table; if (!ids) return 0; while (ids->id) { if (ids->id == DIO_WILDCARD) return 1; if (DIO_NEEDSSECID(ids->id & 0xff)) { if (ids->id == d->id) return 1; } else { if ((ids->id & 0xff) == (d->id & 0xff)) return 1; } ids++; } return 0;}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_match_device);EXPORT_SYMBOL(dio_register_driver);EXPORT_SYMBOL(dio_unregister_driver);EXPORT_SYMBOL(dio_dev_driver);EXPORT_SYMBOL(dio_bus_type);
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