4 * Copyright (C) 2004 Jochen Friedrich
6 * Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-driver.c
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/dio.h>
19 * dio_match_device - Tell if a DIO device structure has a matching DIO device id structure
20 * @ids: array of DIO device id structures to search in
21 * @d: the DIO device structure to match against
23 * Used by a driver to check whether a DIO device present in the
24 * system is in its list of supported devices. Returns the matching
25 * dio_device_id structure or %NULL if there is no match.
28 static const struct dio_device_id *
29 dio_match_device(const struct dio_device_id *ids,
30 const struct dio_dev *d)
33 if (ids->id == DIO_WILDCARD)
35 if (DIO_NEEDSSECID(ids->id & 0xff)) {
39 if ((ids->id & 0xff) == (d->id & 0xff))
47 static int dio_device_probe(struct device *dev)
50 struct dio_driver *drv = to_dio_driver(dev->driver);
51 struct dio_dev *d = to_dio_dev(dev);
53 if (!d->driver && drv->probe) {
54 const struct dio_device_id *id;
56 id = dio_match_device(drv->id_table, d);
58 error = drv->probe(d, id);
69 * dio_register_driver - register a new DIO driver
70 * @drv: the driver structure to register
72 * Adds the driver structure to the list of registered drivers
73 * Returns zero or a negative error value.
76 int dio_register_driver(struct dio_driver *drv)
78 /* initialize common driver fields */
79 drv->driver.name = drv->name;
80 drv->driver.bus = &dio_bus_type;
82 /* register with core */
83 return driver_register(&drv->driver);
88 * dio_unregister_driver - unregister a DIO driver
89 * @drv: the driver structure to unregister
91 * Deletes the driver structure from the list of registered DIO drivers,
92 * gives it a chance to clean up by calling its remove() function for
93 * each device it was responsible for, and marks those devices as
97 void dio_unregister_driver(struct dio_driver *drv)
99 driver_unregister(&drv->driver);
104 * dio_bus_match - Tell if a DIO device structure has a matching DIO device id structure
105 * @dev: the DIO device structure to match against
106 * @drv: the &device_driver that points to the array of DIO device id structures to search
108 * Used by the driver core to check whether a DIO device present in the
109 * system is in a driver's list of supported devices. Returns 1 if supported,
110 * and 0 if there is no match.
113 static int dio_bus_match(struct device *dev, struct device_driver *drv)
115 struct dio_dev *d = to_dio_dev(dev);
116 struct dio_driver *dio_drv = to_dio_driver(drv);
117 const struct dio_device_id *ids = dio_drv->id_table;
122 return dio_match_device(ids, d) ? 1 : 0;
126 struct bus_type dio_bus_type = {
128 .match = dio_bus_match,
129 .probe = dio_device_probe,
133 static int __init dio_driver_init(void)
135 return bus_register(&dio_bus_type);
138 postcore_initcall(dio_driver_init);
140 EXPORT_SYMBOL(dio_register_driver);
141 EXPORT_SYMBOL(dio_unregister_driver);
142 EXPORT_SYMBOL(dio_bus_type);