2 * RapidIO driver support
4 * Copyright 2005 MontaVista Software, Inc.
5 * Matt Porter <mporter@kernel.crashing.org>
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.
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/rio.h>
16 #include <linux/rio_ids.h>
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
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.
29 static const struct rio_device_id
*rio_match_device(const struct rio_device_id
31 const struct rio_dev
*rdev
)
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
)))
47 * rio_dev_get - Increments the reference count of the RIO device structure
49 * @rdev: RIO device being referenced
51 * Each live reference to a device should be refcounted.
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.
57 struct rio_dev
*rio_dev_get(struct rio_dev
*rdev
)
60 get_device(&rdev
->dev
);
66 * rio_dev_put - Release a use of the RIO device structure
68 * @rdev: RIO device being disconnected
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.
74 void rio_dev_put(struct rio_dev
*rdev
)
77 put_device(&rdev
->dev
);
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
84 * return 0 and set rio_dev->driver when drv claims rio_dev, else error
86 static int rio_device_probe(struct device
*dev
)
88 struct rio_driver
*rdrv
= to_rio_driver(dev
->driver
);
89 struct rio_dev
*rdev
= to_rio_dev(dev
);
91 const struct rio_device_id
*id
;
93 if (!rdev
->driver
&& rdrv
->probe
) {
96 id
= rio_match_device(rdrv
->id_table
, rdev
);
99 error
= rdrv
->probe(rdev
, id
);
110 * rio_device_remove - Remove a RIO device from the system
112 * @dev: the RIO device structure to match against
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.
118 static int rio_device_remove(struct device
*dev
)
120 struct rio_dev
*rdev
= to_rio_dev(dev
);
121 struct rio_driver
*rdrv
= rdev
->driver
;
135 * rio_register_driver - register a new RIO driver
136 * @rdrv: the RIO driver structure to register
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.
143 int rio_register_driver(struct rio_driver
*rdrv
)
145 /* initialize common driver fields */
146 rdrv
->driver
.name
= rdrv
->name
;
147 rdrv
->driver
.bus
= &rio_bus_type
;
149 /* register with core */
150 return driver_register(&rdrv
->driver
);
154 * rio_unregister_driver - unregister a RIO driver
155 * @rdrv: the RIO driver structure to unregister
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.
162 void rio_unregister_driver(struct rio_driver
*rdrv
)
164 driver_unregister(&rdrv
->driver
);
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
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
177 static int rio_match_bus(struct device
*dev
, struct device_driver
*drv
)
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
;
187 found_id
= rio_match_device(id
, rdev
);
195 static struct device rio_bus
= {
196 .init_name
= "rapidio",
199 struct bus_type rio_bus_type
= {
201 .match
= rio_match_bus
,
202 .dev_attrs
= rio_dev_attrs
,
203 .probe
= rio_device_probe
,
204 .remove
= rio_device_remove
,
208 * rio_bus_init - Register the RapidIO bus with the device model
210 * Registers the RIO bus device and RIO bus type with the Linux
213 static int __init
rio_bus_init(void)
215 if (device_register(&rio_bus
) < 0)
216 printk("RIO: failed to register RIO bus device\n");
217 return bus_register(&rio_bus_type
);
220 postcore_initcall(rio_bus_init
);
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
);
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