2 * driver.c - centralized device driver management
4 * Copyright (c) 2002-3 Patrick Mochel
5 * Copyright (c) 2002-3 Open Source Development Labs
6 * Copyright (c) 2007 Greg Kroah-Hartman <gregkh@suse.de>
7 * Copyright (c) 2007 Novell Inc.
9 * This file is released under the GPLv2
13 #include <linux/device.h>
14 #include <linux/module.h>
15 #include <linux/errno.h>
16 #include <linux/slab.h>
17 #include <linux/string.h>
20 static struct device
*next_device(struct klist_iter
*i
)
22 struct klist_node
*n
= klist_next(i
);
23 struct device
*dev
= NULL
;
24 struct device_private
*dev_prv
;
27 dev_prv
= to_device_private_driver(n
);
28 dev
= dev_prv
->device
;
34 * driver_for_each_device - Iterator for devices bound to a driver.
35 * @drv: Driver we're iterating.
36 * @start: Device to begin with
37 * @data: Data to pass to the callback.
38 * @fn: Function to call for each device.
40 * Iterate over the @drv's list of devices calling @fn for each one.
42 int driver_for_each_device(struct device_driver
*drv
, struct device
*start
,
43 void *data
, int (*fn
)(struct device
*, void *))
52 klist_iter_init_node(&drv
->p
->klist_devices
, &i
,
53 start
? &start
->p
->knode_driver
: NULL
);
54 while ((dev
= next_device(&i
)) && !error
)
55 error
= fn(dev
, data
);
59 EXPORT_SYMBOL_GPL(driver_for_each_device
);
62 * driver_find_device - device iterator for locating a particular device.
63 * @drv: The device's driver
64 * @start: Device to begin with
65 * @data: Data to pass to match function
66 * @match: Callback function to check device
68 * This is similar to the driver_for_each_device() function above, but
69 * it returns a reference to a device that is 'found' for later use, as
70 * determined by the @match callback.
72 * The callback should return 0 if the device doesn't match and non-zero
73 * if it does. If the callback returns non-zero, this function will
74 * return to the caller and not iterate over any more devices.
76 struct device
*driver_find_device(struct device_driver
*drv
,
77 struct device
*start
, void *data
,
78 int (*match
)(struct device
*dev
, void *data
))
86 klist_iter_init_node(&drv
->p
->klist_devices
, &i
,
87 (start
? &start
->p
->knode_driver
: NULL
));
88 while ((dev
= next_device(&i
)))
89 if (match(dev
, data
) && get_device(dev
))
94 EXPORT_SYMBOL_GPL(driver_find_device
);
97 * driver_create_file - create sysfs file for driver.
99 * @attr: driver attribute descriptor.
101 int driver_create_file(struct device_driver
*drv
,
102 const struct driver_attribute
*attr
)
106 error
= sysfs_create_file(&drv
->p
->kobj
, &attr
->attr
);
111 EXPORT_SYMBOL_GPL(driver_create_file
);
114 * driver_remove_file - remove sysfs file for driver.
116 * @attr: driver attribute descriptor.
118 void driver_remove_file(struct device_driver
*drv
,
119 const struct driver_attribute
*attr
)
122 sysfs_remove_file(&drv
->p
->kobj
, &attr
->attr
);
124 EXPORT_SYMBOL_GPL(driver_remove_file
);
126 static int driver_add_groups(struct device_driver
*drv
,
127 const struct attribute_group
**groups
)
133 for (i
= 0; groups
[i
]; i
++) {
134 error
= sysfs_create_group(&drv
->p
->kobj
, groups
[i
]);
137 sysfs_remove_group(&drv
->p
->kobj
,
146 static void driver_remove_groups(struct device_driver
*drv
,
147 const struct attribute_group
**groups
)
152 for (i
= 0; groups
[i
]; i
++)
153 sysfs_remove_group(&drv
->p
->kobj
, groups
[i
]);
157 * driver_register - register driver with bus
158 * @drv: driver to register
160 * We pass off most of the work to the bus_add_driver() call,
161 * since most of the things we have to do deal with the bus
164 int driver_register(struct device_driver
*drv
)
167 struct device_driver
*other
;
169 BUG_ON(!drv
->bus
->p
);
171 if ((drv
->bus
->probe
&& drv
->probe
) ||
172 (drv
->bus
->remove
&& drv
->remove
) ||
173 (drv
->bus
->shutdown
&& drv
->shutdown
))
174 printk(KERN_WARNING
"Driver '%s' needs updating - please use "
175 "bus_type methods\n", drv
->name
);
177 other
= driver_find(drv
->name
, drv
->bus
);
179 printk(KERN_ERR
"Error: Driver '%s' is already registered, "
180 "aborting...\n", drv
->name
);
184 ret
= bus_add_driver(drv
);
187 ret
= driver_add_groups(drv
, drv
->groups
);
189 bus_remove_driver(drv
);
192 kobject_uevent(&drv
->p
->kobj
, KOBJ_ADD
);
196 EXPORT_SYMBOL_GPL(driver_register
);
199 * driver_unregister - remove driver from system.
202 * Again, we pass off most of the work to the bus-level call.
204 void driver_unregister(struct device_driver
*drv
)
206 if (!drv
|| !drv
->p
) {
207 WARN(1, "Unexpected driver unregister!\n");
210 driver_remove_groups(drv
, drv
->groups
);
211 bus_remove_driver(drv
);
213 EXPORT_SYMBOL_GPL(driver_unregister
);
216 * driver_find - locate driver on a bus by its name.
217 * @name: name of the driver.
218 * @bus: bus to scan for the driver.
220 * Call kset_find_obj() to iterate over list of drivers on
221 * a bus to find driver by name. Return driver if found.
223 * This routine provides no locking to prevent the driver it returns
224 * from being unregistered or unloaded while the caller is using it.
225 * The caller is responsible for preventing this.
227 struct device_driver
*driver_find(const char *name
, struct bus_type
*bus
)
229 struct kobject
*k
= kset_find_obj(bus
->p
->drivers_kset
, name
);
230 struct driver_private
*priv
;
233 /* Drop reference added by kset_find_obj() */
240 EXPORT_SYMBOL_GPL(driver_find
);
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