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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 | |
74 | * Returns the number of DIO devices which were claimed by the driver | |
75 | * during registration. The driver remains registered even if the | |
76 | * return value is zero. | |
77 | */ | |
78 | ||
79 | int dio_register_driver(struct dio_driver *drv) | |
80 | { | |
81 | int count = 0; | |
82 | ||
83 | /* initialize common driver fields */ | |
84 | drv->driver.name = drv->name; | |
85 | drv->driver.bus = &dio_bus_type; | |
86 | drv->driver.probe = dio_device_probe; | |
87 | ||
88 | /* register with core */ | |
89 | count = driver_register(&drv->driver); | |
90 | return count ? count : 1; | |
91 | } | |
92 | ||
93 | ||
94 | /** | |
95 | * dio_unregister_driver - unregister a DIO driver | |
96 | * @drv: the driver structure to unregister | |
97 | * | |
98 | * Deletes the driver structure from the list of registered DIO drivers, | |
99 | * gives it a chance to clean up by calling its remove() function for | |
100 | * each device it was responsible for, and marks those devices as | |
101 | * driverless. | |
102 | */ | |
103 | ||
104 | void dio_unregister_driver(struct dio_driver *drv) | |
105 | { | |
106 | driver_unregister(&drv->driver); | |
107 | } | |
108 | ||
109 | ||
110 | /** | |
111 | * dio_bus_match - Tell if a DIO device structure has a matching DIO | |
112 | * device id structure | |
113 | * @ids: array of DIO device id structures to search in | |
114 | * @dev: the DIO device structure to match against | |
115 | * | |
116 | * Used by a driver to check whether a DIO device present in the | |
117 | * system is in its list of supported devices. Returns the matching | |
118 | * dio_device_id structure or %NULL if there is no match. | |
119 | */ | |
120 | ||
121 | static int dio_bus_match(struct device *dev, struct device_driver *drv) | |
122 | { | |
123 | struct dio_dev *d = to_dio_dev(dev); | |
124 | struct dio_driver *dio_drv = to_dio_driver(drv); | |
125 | const struct dio_device_id *ids = dio_drv->id_table; | |
126 | ||
127 | if (!ids) | |
128 | return 0; | |
129 | ||
130 | while (ids->id) { | |
131 | if (ids->id == DIO_WILDCARD) | |
132 | return 1; | |
133 | if (DIO_NEEDSSECID(ids->id & 0xff)) { | |
134 | if (ids->id == d->id) | |
135 | return 1; | |
136 | } else { | |
137 | if ((ids->id & 0xff) == (d->id & 0xff)) | |
138 | return 1; | |
139 | } | |
140 | ids++; | |
141 | } | |
142 | return 0; | |
143 | } | |
144 | ||
145 | ||
146 | struct bus_type dio_bus_type = { | |
147 | .name = "dio", | |
148 | .match = dio_bus_match | |
149 | }; | |
150 | ||
151 | ||
152 | static int __init dio_driver_init(void) | |
153 | { | |
154 | return bus_register(&dio_bus_type); | |
155 | } | |
156 | ||
157 | postcore_initcall(dio_driver_init); | |
158 | ||
159 | EXPORT_SYMBOL(dio_match_device); | |
160 | EXPORT_SYMBOL(dio_register_driver); | |
161 | EXPORT_SYMBOL(dio_unregister_driver); | |
162 | EXPORT_SYMBOL(dio_dev_driver); | |
163 | EXPORT_SYMBOL(dio_bus_type); |