aboutsummaryrefslogtreecommitdiff
path: root/drivers/rapidio/rio-driver.c
blob: a0c875563d7669fbf69916c95bd0b0219417d985 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
/*
 * RapidIO driver support
 *
 * Copyright 2005 MontaVista Software, Inc.
 * Matt Porter <mporter@kernel.crashing.org>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/rio.h>
#include <linux/rio_ids.h>

#include "rio.h"

/**
 *  rio_match_device - Tell if a RIO device has a matching RIO device id structure
 *  @id: the RIO device id structure to match against
 *  @rdev: the RIO device structure to match against
 *
 *  Used from driver probe and bus matching to check whether a RIO device
 *  matches a device id structure provided by a RIO driver. Returns the
 *  matching &struct rio_device_id or %NULL if there is no match.
 */
static const struct rio_device_id *rio_match_device(const struct rio_device_id
						    *id,
						    const struct rio_dev *rdev)
{
	while (id->vid || id->asm_vid) {
		if (((id->vid == RIO_ANY_ID) || (id->vid == rdev->vid)) &&
		    ((id->did == RIO_ANY_ID) || (id->did == rdev->did)) &&
		    ((id->asm_vid == RIO_ANY_ID)
		     || (id->asm_vid == rdev->asm_vid))
		    && ((id->asm_did == RIO_ANY_ID)
			|| (id->asm_did == rdev->asm_did)))
			return id;
		id++;
	}
	return NULL;
}

/**
 * rio_dev_get - Increments the reference count of the RIO device structure
 *
 * @rdev: RIO device being referenced
 *
 * Each live reference to a device should be refcounted.
 *
 * Drivers for RIO devices should normally record such references in
 * their probe() methods, when they bind to a device, and release
 * them by calling rio_dev_put(), in their disconnect() methods.
 */
struct rio_dev *rio_dev_get(struct rio_dev *rdev)
{
	if (rdev)
		get_device(&rdev->dev);

	return rdev;
}

/**
 * rio_dev_put - Release a use of the RIO device structure
 *
 * @rdev: RIO device being disconnected
 *
 * Must be called when a user of a device is finished with it.
 * When the last user of the device calls this function, the
 * memory of the device is freed.
 */
void rio_dev_put(struct rio_dev *rdev)
{
	if (rdev)
		put_device(&rdev->dev);
}

/**
 *  rio_device_probe - Tell if a RIO device structure has a matching RIO device id structure
 *  @dev: the RIO device structure to match against
 *
 * return 0 and set rio_dev->driver when drv claims rio_dev, else error
 */
static int rio_device_probe(struct device *dev)
{
	struct rio_driver *rdrv = to_rio_driver(dev->driver);
	struct rio_dev *rdev = to_rio_dev(dev);
	int error = -ENODEV;
	const struct rio_device_id *id;

	if (!rdev->driver && rdrv->probe) {
		if (!rdrv->id_table)
			return error;
		id = rio_match_device(rdrv->id_table, rdev);
		rio_dev_get(rdev);
		if (id)
			error = rdrv->probe(rdev, id);
		if (error >= 0) {
			rdev->driver = rdrv;
			error = 0;
		} else
			rio_dev_put(rdev);
	}
	return error;
}

/**
 *  rio_device_remove - Remove a RIO device from the system
 *
 *  @dev: the RIO device structure to match against
 *
 * Remove a RIO device from the system. If it has an associated
 * driver, then run the driver remove() method.  Then update
 * the reference count.
 */
static int rio_device_remove(struct device *dev)
{
	struct rio_dev *rdev = to_rio_dev(dev);
	struct rio_driver *rdrv = rdev->driver;

	if (rdrv) {
		if (rdrv->remove)
			rdrv->remove(rdev);
		rdev->driver = NULL;
	}

	rio_dev_put(rdev);

	return 0;
}

/**
 *  rio_register_driver - register a new RIO driver
 *  @rdrv: the RIO driver structure to register
 *
 *  Adds a &struct rio_driver to the list of registered drivers.
 *  Returns a negative value on error, otherwise 0. If no error
 *  occurred, the driver remains registered even if no device
 *  was claimed during registration.
 */
int rio_register_driver(struct rio_driver *rdrv)
{
	/* initialize common driver fields */
	rdrv->driver.name = rdrv->name;
	rdrv->driver.bus = &rio_bus_type;

	/* register with core */
	return driver_register(&rdrv->driver);
}

/**
 *  rio_unregister_driver - unregister a RIO driver
 *  @rdrv: the RIO driver structure to unregister
 *
 *  Deletes the &struct rio_driver from the list of registered RIO
 *  drivers, gives it a chance to clean up by calling its remove()
 *  function for each device it was responsible for, and marks those
 *  devices as driverless.
 */
void rio_unregister_driver(struct rio_driver *rdrv)
{
	driver_unregister(&rdrv->driver);
}

void rio_attach_device(struct rio_dev *rdev)
{
	rdev->dev.bus = &rio_bus_type;
	rdev->dev.parent = &rio_bus;
}
EXPORT_SYMBOL_GPL(rio_attach_device);

/**
 *  rio_match_bus - Tell if a RIO device structure has a matching RIO driver device id structure
 *  @dev: the standard device structure to match against
 *  @drv: the standard driver structure containing the ids to match against
 *
 *  Used by a driver to check whether a RIO device present in the
 *  system is in its list of supported devices. Returns 1 if
 *  there is a matching &struct rio_device_id or 0 if there is
 *  no match.
 */
static int rio_match_bus(struct device *dev, struct device_driver *drv)
{
	struct rio_dev *rdev = to_rio_dev(dev);
	struct rio_driver *rdrv = to_rio_driver(drv);
	const struct rio_device_id *id = rdrv->id_table;
	const struct rio_device_id *found_id;

	if (!id)
		goto out;

	found_id = rio_match_device(id, rdev);

	if (found_id)
		return 1;

      out:return 0;
}

struct device rio_bus = {
	.init_name = "rapidio",
};

struct bus_type rio_bus_type = {
	.name = "rapidio",
	.match = rio_match_bus,
	.dev_attrs = rio_dev_attrs,
	.bus_attrs = rio_bus_attrs,
	.probe = rio_device_probe,
	.remove = rio_device_remove,
};

/**
 *  rio_bus_init - Register the RapidIO bus with the device model
 *
 *  Registers the RIO bus device and RIO bus type with the Linux
 *  device model.
 */
static int __init rio_bus_init(void)
{
	if (device_register(&rio_bus) < 0)
		printk("RIO: failed to register RIO bus device\n");
	return bus_register(&rio_bus_type);
}

postcore_initcall(rio_bus_init);

EXPORT_SYMBOL_GPL(rio_register_driver);
EXPORT_SYMBOL_GPL(rio_unregister_driver);
EXPORT_SYMBOL_GPL(rio_bus_type);
EXPORT_SYMBOL_GPL(rio_dev_get);
EXPORT_SYMBOL_GPL(rio_dev_put);