Root/drivers/dio/dio-driver.c

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 DIO device id structure
20 * @ids: array of DIO device id structures to search in
21 * @d: the DIO device structure to match against
22 *
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.
26 */
27
28const struct dio_device_id *
29dio_match_device(const struct dio_device_id *ids,
30           const struct dio_dev *d)
31{
32    while (ids->id) {
33        if (ids->id == DIO_WILDCARD)
34            return ids;
35        if (DIO_NEEDSSECID(ids->id & 0xff)) {
36            if (ids->id == d->id)
37                return ids;
38        } else {
39            if ((ids->id & 0xff) == (d->id & 0xff))
40                return ids;
41        }
42        ids++;
43    }
44    return NULL;
45}
46
47static int dio_device_probe(struct device *dev)
48{
49    int error = 0;
50    struct dio_driver *drv = to_dio_driver(dev->driver);
51    struct dio_dev *d = to_dio_dev(dev);
52
53    if (!d->driver && drv->probe) {
54        const struct dio_device_id *id;
55
56        id = dio_match_device(drv->id_table, d);
57        if (id)
58            error = drv->probe(d, id);
59        if (error >= 0) {
60            d->driver = drv;
61            error = 0;
62        }
63    }
64    return error;
65}
66
67
68/**
69 * dio_register_driver - register a new DIO driver
70 * @drv: the driver structure to register
71 *
72 * Adds the driver structure to the list of registered drivers
73 * Returns zero or a negative error value.
74 */
75
76int dio_register_driver(struct dio_driver *drv)
77{
78    /* initialize common driver fields */
79    drv->driver.name = drv->name;
80    drv->driver.bus = &dio_bus_type;
81
82    /* register with core */
83    return driver_register(&drv->driver);
84}
85
86
87/**
88 * dio_unregister_driver - unregister a DIO driver
89 * @drv: the driver structure to unregister
90 *
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
94 * driverless.
95 */
96
97void dio_unregister_driver(struct dio_driver *drv)
98{
99    driver_unregister(&drv->driver);
100}
101
102
103/**
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
107 *
108 * Used by a driver to check whether a DIO device present in the
109 * system is in its list of supported devices. Returns the matching
110 * dio_device_id structure or %NULL if there is no match.
111 */
112
113static int dio_bus_match(struct device *dev, struct device_driver *drv)
114{
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;
118
119    if (!ids)
120        return 0;
121
122    return dio_match_device(ids, d) ? 1 : 0;
123}
124
125
126struct bus_type dio_bus_type = {
127    .name = "dio",
128    .match = dio_bus_match,
129    .probe = dio_device_probe,
130};
131
132
133static int __init dio_driver_init(void)
134{
135    return bus_register(&dio_bus_type);
136}
137
138postcore_initcall(dio_driver_init);
139
140EXPORT_SYMBOL(dio_match_device);
141EXPORT_SYMBOL(dio_register_driver);
142EXPORT_SYMBOL(dio_unregister_driver);
143EXPORT_SYMBOL(dio_bus_type);
144

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