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1 | /* |
2 | * RapidIO driver support |
3 | * |
4 | * Copyright 2005 MontaVista Software, Inc. |
5 | * Matt Porter <mporter@kernel.crashing.org> |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify it |
8 | * under the terms of the GNU General Public License as published by the |
9 | * Free Software Foundation; either version 2 of the License, or (at your |
10 | * option) any later version. |
11 | */ |
12 | |
13 | #include <linux/init.h> |
14 | #include <linux/module.h> |
15 | #include <linux/rio.h> |
16 | #include <linux/rio_ids.h> |
17 | |
18 | #include "rio.h" |
19 | |
20 | /** |
21 | * rio_match_device - Tell if a RIO device has a matching RIO device id structure |
22 | * @id: the RIO device id structure to match against |
23 | * @rdev: the RIO device structure to match against |
24 | * |
25 | * Used from driver probe and bus matching to check whether a RIO device |
26 | * matches a device id structure provided by a RIO driver. Returns the |
27 | * matching &struct rio_device_id or %NULL if there is no match. |
28 | */ |
29 | static const struct rio_device_id *rio_match_device(const struct rio_device_id |
30 | *id, |
31 | const struct rio_dev *rdev) |
32 | { |
33 | while (id->vid || id->asm_vid) { |
34 | if (((id->vid == RIO_ANY_ID) || (id->vid == rdev->vid)) && |
35 | ((id->did == RIO_ANY_ID) || (id->did == rdev->did)) && |
36 | ((id->asm_vid == RIO_ANY_ID) |
37 | || (id->asm_vid == rdev->asm_vid)) |
38 | && ((id->asm_did == RIO_ANY_ID) |
39 | || (id->asm_did == rdev->asm_did))) |
40 | return id; |
41 | id++; |
42 | } |
43 | return NULL; |
44 | } |
45 | |
46 | /** |
47 | * rio_dev_get - Increments the reference count of the RIO device structure |
48 | * |
49 | * @rdev: RIO device being referenced |
50 | * |
51 | * Each live reference to a device should be refcounted. |
52 | * |
53 | * Drivers for RIO devices should normally record such references in |
54 | * their probe() methods, when they bind to a device, and release |
55 | * them by calling rio_dev_put(), in their disconnect() methods. |
56 | */ |
57 | struct rio_dev *rio_dev_get(struct rio_dev *rdev) |
58 | { |
59 | if (rdev) |
60 | get_device(&rdev->dev); |
61 | |
62 | return rdev; |
63 | } |
64 | |
65 | /** |
66 | * rio_dev_put - Release a use of the RIO device structure |
67 | * |
68 | * @rdev: RIO device being disconnected |
69 | * |
70 | * Must be called when a user of a device is finished with it. |
71 | * When the last user of the device calls this function, the |
72 | * memory of the device is freed. |
73 | */ |
74 | void rio_dev_put(struct rio_dev *rdev) |
75 | { |
76 | if (rdev) |
77 | put_device(&rdev->dev); |
78 | } |
79 | |
80 | /** |
81 | * rio_device_probe - Tell if a RIO device structure has a matching RIO device id structure |
82 | * @dev: the RIO device structure to match against |
83 | * |
84 | * return 0 and set rio_dev->driver when drv claims rio_dev, else error |
85 | */ |
86 | static int rio_device_probe(struct device *dev) |
87 | { |
88 | struct rio_driver *rdrv = to_rio_driver(dev->driver); |
89 | struct rio_dev *rdev = to_rio_dev(dev); |
90 | int error = -ENODEV; |
91 | const struct rio_device_id *id; |
92 | |
93 | if (!rdev->driver && rdrv->probe) { |
94 | if (!rdrv->id_table) |
95 | return error; |
96 | id = rio_match_device(rdrv->id_table, rdev); |
97 | rio_dev_get(rdev); |
98 | if (id) |
99 | error = rdrv->probe(rdev, id); |
100 | if (error >= 0) { |
101 | rdev->driver = rdrv; |
102 | error = 0; |
103 | } else |
104 | rio_dev_put(rdev); |
105 | } |
106 | return error; |
107 | } |
108 | |
109 | /** |
110 | * rio_device_remove - Remove a RIO device from the system |
111 | * |
112 | * @dev: the RIO device structure to match against |
113 | * |
114 | * Remove a RIO device from the system. If it has an associated |
115 | * driver, then run the driver remove() method. Then update |
116 | * the reference count. |
117 | */ |
118 | static int rio_device_remove(struct device *dev) |
119 | { |
120 | struct rio_dev *rdev = to_rio_dev(dev); |
121 | struct rio_driver *rdrv = rdev->driver; |
122 | |
123 | if (rdrv) { |
124 | if (rdrv->remove) |
125 | rdrv->remove(rdev); |
126 | rdev->driver = NULL; |
127 | } |
128 | |
129 | rio_dev_put(rdev); |
130 | |
131 | return 0; |
132 | } |
133 | |
134 | /** |
135 | * rio_register_driver - register a new RIO driver |
136 | * @rdrv: the RIO driver structure to register |
137 | * |
138 | * Adds a &struct rio_driver to the list of registered drivers. |
139 | * Returns a negative value on error, otherwise 0. If no error |
140 | * occurred, the driver remains registered even if no device |
141 | * was claimed during registration. |
142 | */ |
143 | int rio_register_driver(struct rio_driver *rdrv) |
144 | { |
145 | /* initialize common driver fields */ |
146 | rdrv->driver.name = rdrv->name; |
147 | rdrv->driver.bus = &rio_bus_type; |
148 | |
149 | /* register with core */ |
150 | return driver_register(&rdrv->driver); |
151 | } |
152 | |
153 | /** |
154 | * rio_unregister_driver - unregister a RIO driver |
155 | * @rdrv: the RIO driver structure to unregister |
156 | * |
157 | * Deletes the &struct rio_driver from the list of registered RIO |
158 | * drivers, gives it a chance to clean up by calling its remove() |
159 | * function for each device it was responsible for, and marks those |
160 | * devices as driverless. |
161 | */ |
162 | void rio_unregister_driver(struct rio_driver *rdrv) |
163 | { |
164 | driver_unregister(&rdrv->driver); |
165 | } |
166 | |
167 | /** |
168 | * rio_match_bus - Tell if a RIO device structure has a matching RIO driver device id structure |
169 | * @dev: the standard device structure to match against |
170 | * @drv: the standard driver structure containing the ids to match against |
171 | * |
172 | * Used by a driver to check whether a RIO device present in the |
173 | * system is in its list of supported devices. Returns 1 if |
174 | * there is a matching &struct rio_device_id or 0 if there is |
175 | * no match. |
176 | */ |
177 | static int rio_match_bus(struct device *dev, struct device_driver *drv) |
178 | { |
179 | struct rio_dev *rdev = to_rio_dev(dev); |
180 | struct rio_driver *rdrv = to_rio_driver(drv); |
181 | const struct rio_device_id *id = rdrv->id_table; |
182 | const struct rio_device_id *found_id; |
183 | |
184 | if (!id) |
185 | goto out; |
186 | |
187 | found_id = rio_match_device(id, rdev); |
188 | |
189 | if (found_id) |
190 | return 1; |
191 | |
192 | out:return 0; |
193 | } |
194 | |
195 | struct device rio_bus = { |
196 | .init_name = "rapidio", |
197 | }; |
198 | |
199 | struct bus_type rio_bus_type = { |
200 | .name = "rapidio", |
201 | .match = rio_match_bus, |
202 | .dev_attrs = rio_dev_attrs, |
203 | .probe = rio_device_probe, |
204 | .remove = rio_device_remove, |
205 | }; |
206 | |
207 | /** |
208 | * rio_bus_init - Register the RapidIO bus with the device model |
209 | * |
210 | * Registers the RIO bus device and RIO bus type with the Linux |
211 | * device model. |
212 | */ |
213 | static int __init rio_bus_init(void) |
214 | { |
215 | if (device_register(&rio_bus) < 0) |
216 | printk("RIO: failed to register RIO bus device\n"); |
217 | return bus_register(&rio_bus_type); |
218 | } |
219 | |
220 | postcore_initcall(rio_bus_init); |
221 | |
222 | EXPORT_SYMBOL_GPL(rio_register_driver); |
223 | EXPORT_SYMBOL_GPL(rio_unregister_driver); |
224 | EXPORT_SYMBOL_GPL(rio_bus_type); |
225 | EXPORT_SYMBOL_GPL(rio_dev_get); |
226 | EXPORT_SYMBOL_GPL(rio_dev_put); |
227 |
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