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