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1da177e4 LT |
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 | ||
29 | const struct dio_device_id * | |
30 | dio_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 | ||
48 | static 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 | |
e51c01b0 | 74 | * Returns zero or a negative error value. |
1da177e4 LT |
75 | */ |
76 | ||
77 | int dio_register_driver(struct dio_driver *drv) | |
78 | { | |
1da177e4 LT |
79 | /* initialize common driver fields */ |
80 | drv->driver.name = drv->name; | |
81 | drv->driver.bus = &dio_bus_type; | |
1da177e4 LT |
82 | |
83 | /* register with core */ | |
e51c01b0 | 84 | return driver_register(&drv->driver); |
1da177e4 LT |
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 | ||
98 | void 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 | ||
115 | static 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 | ||
140 | struct bus_type dio_bus_type = { | |
141 | .name = "dio", | |
5b34bf88 RK |
142 | .match = dio_bus_match, |
143 | .probe = dio_device_probe, | |
1da177e4 LT |
144 | }; |
145 | ||
146 | ||
147 | static int __init dio_driver_init(void) | |
148 | { | |
149 | return bus_register(&dio_bus_type); | |
150 | } | |
151 | ||
152 | postcore_initcall(dio_driver_init); | |
153 | ||
154 | EXPORT_SYMBOL(dio_match_device); | |
155 | EXPORT_SYMBOL(dio_register_driver); | |
156 | EXPORT_SYMBOL(dio_unregister_driver); | |
157 | EXPORT_SYMBOL(dio_dev_driver); | |
158 | EXPORT_SYMBOL(dio_bus_type); |