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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 | ||
771fcb58 RD |
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 | */ | |
1da177e4 | 27 | |
b3875759 | 28 | static const struct dio_device_id * |
1da177e4 LT |
29 | dio_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 | ||
47 | static 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 | ||
771fcb58 RD |
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 | */ | |
1da177e4 LT |
75 | |
76 | int dio_register_driver(struct dio_driver *drv) | |
77 | { | |
1da177e4 LT |
78 | /* initialize common driver fields */ |
79 | drv->driver.name = drv->name; | |
80 | drv->driver.bus = &dio_bus_type; | |
1da177e4 LT |
81 | |
82 | /* register with core */ | |
e51c01b0 | 83 | return driver_register(&drv->driver); |
1da177e4 LT |
84 | } |
85 | ||
86 | ||
771fcb58 RD |
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 | */ | |
1da177e4 LT |
96 | |
97 | void dio_unregister_driver(struct dio_driver *drv) | |
98 | { | |
99 | driver_unregister(&drv->driver); | |
100 | } | |
101 | ||
102 | ||
771fcb58 RD |
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 | * | |
b87c9661 GU |
108 | * Used by the driver core to check whether a DIO device present in the |
109 | * system is in a driver's list of supported devices. Returns 1 if supported, | |
110 | * and 0 if there is no match. | |
771fcb58 | 111 | */ |
1da177e4 LT |
112 | |
113 | static 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 | ||
18c99362 | 122 | return dio_match_device(ids, d) ? 1 : 0; |
1da177e4 LT |
123 | } |
124 | ||
125 | ||
126 | struct bus_type dio_bus_type = { | |
127 | .name = "dio", | |
5b34bf88 RK |
128 | .match = dio_bus_match, |
129 | .probe = dio_device_probe, | |
1da177e4 LT |
130 | }; |
131 | ||
132 | ||
133 | static int __init dio_driver_init(void) | |
134 | { | |
135 | return bus_register(&dio_bus_type); | |
136 | } | |
137 | ||
138 | postcore_initcall(dio_driver_init); | |
139 | ||
1da177e4 LT |
140 | EXPORT_SYMBOL(dio_register_driver); |
141 | EXPORT_SYMBOL(dio_unregister_driver); | |
1da177e4 | 142 | EXPORT_SYMBOL(dio_bus_type); |