1/*
2 *  DIO Driver Services
3 *
4 *  Copyright (C) 2004 Jochen Friedrich
5 *
6 *  Loosely based on drivers/pci/pci-driver.c and drivers/zorro/zorro-driver.c
7 *
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
10 *  for more details.
11 */
12
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/dio.h>
16
17
18	/**
19	 *  dio_match_device - Tell if a DIO device structure has a matching
20	 *                     DIO device id structure
21	 *  @ids: array of DIO device id structures to search in
22	 *  @dev: the DIO device structure to match against
23	 *
24	 *  Used by a driver to check whether a DIO device present in the
25	 *  system is in its list of supported devices. Returns the matching
26	 *  dio_device_id structure or %NULL if there is no match.
27	 */
28
29const struct dio_device_id *
30dio_match_device(const struct dio_device_id *ids,
31		   const struct dio_dev *d)
32{
33	while (ids->id) {
34		if (ids->id == DIO_WILDCARD)
35			return ids;
36		if (DIO_NEEDSSECID(ids->id & 0xff)) {
37			if (ids->id == d->id)
38				return ids;
39		} else {
40			if ((ids->id & 0xff) == (d->id & 0xff))
41				return ids;
42		}
43		ids++;
44	}
45	return NULL;
46}
47
48static int dio_device_probe(struct device *dev)
49{
50	int error = 0;
51	struct dio_driver *drv = to_dio_driver(dev->driver);
52	struct dio_dev *d = to_dio_dev(dev);
53
54	if (!d->driver && drv->probe) {
55		const struct dio_device_id *id;
56
57		id = dio_match_device(drv->id_table, d);
58		if (id)
59			error = drv->probe(d, id);
60		if (error >= 0) {
61			d->driver = drv;
62			error = 0;
63		}
64	}
65	return error;
66}
67
68
69	/**
70	 *  dio_register_driver - register a new DIO driver
71	 *  @drv: the driver structure to register
72	 *
73	 *  Adds the driver structure to the list of registered drivers
74	 *  Returns zero or a negative error value.
75	 */
76
77int dio_register_driver(struct dio_driver *drv)
78{
79	/* initialize common driver fields */
80	drv->driver.name = drv->name;
81	drv->driver.bus = &dio_bus_type;
82
83	/* register with core */
84	return driver_register(&drv->driver);
85}
86
87
88	/**
89	 *  dio_unregister_driver - unregister a DIO driver
90	 *  @drv: the driver structure to unregister
91	 *
92	 *  Deletes the driver structure from the list of registered DIO drivers,
93	 *  gives it a chance to clean up by calling its remove() function for
94	 *  each device it was responsible for, and marks those devices as
95	 *  driverless.
96	 */
97
98void dio_unregister_driver(struct dio_driver *drv)
99{
100	driver_unregister(&drv->driver);
101}
102
103
104	/**
105	 *  dio_bus_match - Tell if a DIO device structure has a matching DIO
106	 *                  device id structure
107	 *  @ids: array of DIO device id structures to search in
108	 *  @dev: the DIO device structure to match against
109	 *
110	 *  Used by a driver to check whether a DIO device present in the
111	 *  system is in its list of supported devices. Returns the matching
112	 *  dio_device_id structure or %NULL if there is no match.
113	 */
114
115static int dio_bus_match(struct device *dev, struct device_driver *drv)
116{
117	struct dio_dev *d = to_dio_dev(dev);
118	struct dio_driver *dio_drv = to_dio_driver(drv);
119	const struct dio_device_id *ids = dio_drv->id_table;
120
121	if (!ids)
122		return 0;
123
124	while (ids->id) {
125		if (ids->id == DIO_WILDCARD)
126			return 1;
127		if (DIO_NEEDSSECID(ids->id & 0xff)) {
128			if (ids->id == d->id)
129				return 1;
130		} else {
131			if ((ids->id & 0xff) == (d->id & 0xff))
132				return 1;
133		}
134		ids++;
135	}
136	return 0;
137}
138
139
140struct bus_type dio_bus_type = {
141	.name	= "dio",
142	.match	= dio_bus_match,
143	.probe	= dio_device_probe,
144};
145
146
147static int __init dio_driver_init(void)
148{
149	return bus_register(&dio_bus_type);
150}
151
152postcore_initcall(dio_driver_init);
153
154EXPORT_SYMBOL(dio_match_device);
155EXPORT_SYMBOL(dio_register_driver);
156EXPORT_SYMBOL(dio_unregister_driver);
157EXPORT_SYMBOL(dio_dev_driver);
158EXPORT_SYMBOL(dio_bus_type);
159