1 /*
2 * Zorro Driver Services
3 *
4 * Copyright (C) 2003 Geert Uytterhoeven
5 *
6 * Loosely based on drivers/pci/pci-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/zorro.h>
16
17
18 /**
19 * zorro_match_device - Tell if a Zorro device structure has a matching
20 * Zorro device id structure
21 * @ids: array of Zorro device id structures to search in
22 * @dev: the Zorro device structure to match against
23 *
24 * Used by a driver to check whether a Zorro device present in the
25 * system is in its list of supported devices. Returns the matching
26 * zorro_device_id structure or %NULL if there is no match.
27 */
28
29 const struct zorro_device_id *
30 zorro_match_device(const struct zorro_device_id *ids,
31 const struct zorro_dev *z)
32 {
33 while (ids->id) {
34 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
35 return ids;
36 ids++;
37 }
38 return NULL;
39 }
40
41
42 static int zorro_device_probe(struct device *dev)
43 {
44 int error = 0;
45 struct zorro_driver *drv = to_zorro_driver(dev->driver);
46 struct zorro_dev *z = to_zorro_dev(dev);
47
48 if (!z->driver && drv->probe) {
49 const struct zorro_device_id *id;
50
51 id = zorro_match_device(drv->id_table, z);
52 if (id)
53 error = drv->probe(z, id);
54 if (error >= 0) {
55 z->driver = drv;
56 error = 0;
57 }
58 }
59 return error;
60 }
61
62
63 /**
64 * zorro_register_driver - register a new Zorro driver
65 * @drv: the driver structure to register
66 *
67 * Adds the driver structure to the list of registered drivers
68 * Returns the number of Zorro devices which were claimed by the driver
69 * during registration. The driver remains registered even if the
70 * return value is zero.
71 */
72
73 int zorro_register_driver(struct zorro_driver *drv)
74 {
75 int count = 0;
76
77 /* initialize common driver fields */
78 drv->driver.name = drv->name;
79 drv->driver.bus = &zorro_bus_type;
80 drv->driver.probe = zorro_device_probe;
81
82 /* register with core */
83 count = driver_register(&drv->driver);
84 return count ? count : 1;
85 }
86
87
88 /**
89 * zorro_unregister_driver - unregister a zorro driver
90 * @drv: the driver structure to unregister
91 *
92 * Deletes the driver structure from the list of registered Zorro 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
98 void zorro_unregister_driver(struct zorro_driver *drv)
99 {
100 driver_unregister(&drv->driver);
101 }
102
103
104 /**
105 * zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
106 * device id structure
107 * @ids: array of Zorro device id structures to search in
108 * @dev: the Zorro device structure to match against
109 *
110 * Used by a driver to check whether a Zorro device present in the
111 * system is in its list of supported devices.Returns the matching
112 * zorro_device_id structure or %NULL if there is no match.
113 */
114
115 static int zorro_bus_match(struct device *dev, struct device_driver *drv)
116 {
117 struct zorro_dev *z = to_zorro_dev(dev);
118 struct zorro_driver *zorro_drv = to_zorro_driver(drv);
119 const struct zorro_device_id *ids = zorro_drv->id_table;
120
121 if (!ids)
122 return 0;
123
124 while (ids->id) {
125 if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
126 return 1;
127 ids++;
128 }
129 return 0;
130 }
131
132
133 struct bus_type zorro_bus_type = {
134 .name = "zorro",
135 .match = zorro_bus_match
136 };
137
138
139 static int __init zorro_driver_init(void)
140 {
141 return bus_register(&zorro_bus_type);
142 }
143
144 postcore_initcall(zorro_driver_init);
145
146 EXPORT_SYMBOL(zorro_match_device);
147 EXPORT_SYMBOL(zorro_register_driver);
148 EXPORT_SYMBOL(zorro_unregister_driver);
149 EXPORT_SYMBOL(zorro_dev_driver);
150 EXPORT_SYMBOL(zorro_bus_type);
151
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