zorro-driver.c
4.39 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
/*
* Zorro Driver Services
*
* Copyright (C) 2003 Geert Uytterhoeven
*
* Loosely based on drivers/pci/pci-driver.c
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/zorro.h>
/**
* zorro_match_device - Tell if a Zorro device structure has a matching
* Zorro device id structure
* @ids: array of Zorro device id structures to search in
* @dev: the Zorro device structure to match against
*
* Used by a driver to check whether a Zorro device present in the
* system is in its list of supported devices. Returns the matching
* zorro_device_id structure or %NULL if there is no match.
*/
const struct zorro_device_id *
zorro_match_device(const struct zorro_device_id *ids,
const struct zorro_dev *z)
{
while (ids->id) {
if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
return ids;
ids++;
}
return NULL;
}
EXPORT_SYMBOL(zorro_match_device);
static int zorro_device_probe(struct device *dev)
{
int error = 0;
struct zorro_driver *drv = to_zorro_driver(dev->driver);
struct zorro_dev *z = to_zorro_dev(dev);
if (!z->driver && drv->probe) {
const struct zorro_device_id *id;
id = zorro_match_device(drv->id_table, z);
if (id)
error = drv->probe(z, id);
if (error >= 0) {
z->driver = drv;
error = 0;
}
}
return error;
}
static int zorro_device_remove(struct device *dev)
{
struct zorro_dev *z = to_zorro_dev(dev);
struct zorro_driver *drv = to_zorro_driver(dev->driver);
if (drv) {
if (drv->remove)
drv->remove(z);
z->driver = NULL;
}
return 0;
}
/**
* zorro_register_driver - register a new Zorro driver
* @drv: the driver structure to register
*
* Adds the driver structure to the list of registered drivers
* Returns zero or a negative error value.
*/
int zorro_register_driver(struct zorro_driver *drv)
{
/* initialize common driver fields */
drv->driver.name = drv->name;
drv->driver.bus = &zorro_bus_type;
/* register with core */
return driver_register(&drv->driver);
}
EXPORT_SYMBOL(zorro_register_driver);
/**
* zorro_unregister_driver - unregister a zorro driver
* @drv: the driver structure to unregister
*
* Deletes the driver structure from the list of registered Zorro drivers,
* gives it a chance to clean up by calling its remove() function for
* each device it was responsible for, and marks those devices as
* driverless.
*/
void zorro_unregister_driver(struct zorro_driver *drv)
{
driver_unregister(&drv->driver);
}
EXPORT_SYMBOL(zorro_unregister_driver);
/**
* zorro_bus_match - Tell if a Zorro device structure has a matching Zorro
* device id structure
* @ids: array of Zorro device id structures to search in
* @dev: the Zorro device structure to match against
*
* Used by a driver to check whether a Zorro device present in the
* system is in its list of supported devices.Returns the matching
* zorro_device_id structure or %NULL if there is no match.
*/
static int zorro_bus_match(struct device *dev, struct device_driver *drv)
{
struct zorro_dev *z = to_zorro_dev(dev);
struct zorro_driver *zorro_drv = to_zorro_driver(drv);
const struct zorro_device_id *ids = zorro_drv->id_table;
if (!ids)
return 0;
while (ids->id) {
if (ids->id == ZORRO_WILDCARD || ids->id == z->id)
return 1;
ids++;
}
return 0;
}
static int zorro_uevent(struct device *dev, struct kobj_uevent_env *env)
{
struct zorro_dev *z;
if (!dev)
return -ENODEV;
z = to_zorro_dev(dev);
if (!z)
return -ENODEV;
if (add_uevent_var(env, "ZORRO_ID=%08X", z->id) ||
add_uevent_var(env, "ZORRO_SLOT_NAME=%s", dev_name(dev)) ||
add_uevent_var(env, "ZORRO_SLOT_ADDR=%04X", z->slotaddr) ||
add_uevent_var(env, "MODALIAS=" ZORRO_DEVICE_MODALIAS_FMT, z->id))
return -ENOMEM;
return 0;
}
struct bus_type zorro_bus_type = {
.name = "zorro",
.dev_name = "zorro",
.match = zorro_bus_match,
.uevent = zorro_uevent,
.probe = zorro_device_probe,
.remove = zorro_device_remove,
};
EXPORT_SYMBOL(zorro_bus_type);
static int __init zorro_driver_init(void)
{
return bus_register(&zorro_bus_type);
}
postcore_initcall(zorro_driver_init);