1
2
3
4
5
6
7
8
9
10
11
12
13#include <linux/device.h>
14#include <linux/module.h>
15#include <linux/errno.h>
16#include <linux/string.h>
17#include "base.h"
18
19static struct device *next_device(struct klist_iter *i)
20{
21 struct klist_node *n = klist_next(i);
22 struct device *dev = NULL;
23 struct device_private *dev_prv;
24
25 if (n) {
26 dev_prv = to_device_private_driver(n);
27 dev = dev_prv->device;
28 }
29 return dev;
30}
31
32
33
34
35
36
37
38
39
40
41int driver_for_each_device(struct device_driver *drv, struct device *start,
42 void *data, int (*fn)(struct device *, void *))
43{
44 struct klist_iter i;
45 struct device *dev;
46 int error = 0;
47
48 if (!drv)
49 return -EINVAL;
50
51 klist_iter_init_node(&drv->p->klist_devices, &i,
52 start ? &start->p->knode_driver : NULL);
53 while ((dev = next_device(&i)) && !error)
54 error = fn(dev, data);
55 klist_iter_exit(&i);
56 return error;
57}
58EXPORT_SYMBOL_GPL(driver_for_each_device);
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75struct device *driver_find_device(struct device_driver *drv,
76 struct device *start, void *data,
77 int (*match)(struct device *dev, void *data))
78{
79 struct klist_iter i;
80 struct device *dev;
81
82 if (!drv)
83 return NULL;
84
85 klist_iter_init_node(&drv->p->klist_devices, &i,
86 (start ? &start->p->knode_driver : NULL));
87 while ((dev = next_device(&i)))
88 if (match(dev, data) && get_device(dev))
89 break;
90 klist_iter_exit(&i);
91 return dev;
92}
93EXPORT_SYMBOL_GPL(driver_find_device);
94
95
96
97
98
99
100int driver_create_file(struct device_driver *drv,
101 struct driver_attribute *attr)
102{
103 int error;
104 if (drv)
105 error = sysfs_create_file(&drv->p->kobj, &attr->attr);
106 else
107 error = -EINVAL;
108 return error;
109}
110EXPORT_SYMBOL_GPL(driver_create_file);
111
112
113
114
115
116
117void driver_remove_file(struct device_driver *drv,
118 struct driver_attribute *attr)
119{
120 if (drv)
121 sysfs_remove_file(&drv->p->kobj, &attr->attr);
122}
123EXPORT_SYMBOL_GPL(driver_remove_file);
124
125
126
127
128
129
130
131
132
133
134
135int driver_add_kobj(struct device_driver *drv, struct kobject *kobj,
136 const char *fmt, ...)
137{
138 va_list args;
139 char *name;
140 int ret;
141
142 va_start(args, fmt);
143 name = kvasprintf(GFP_KERNEL, fmt, args);
144 va_end(args);
145
146 if (!name)
147 return -ENOMEM;
148
149 ret = kobject_add(kobj, &drv->p->kobj, "%s", name);
150 kfree(name);
151 return ret;
152}
153EXPORT_SYMBOL_GPL(driver_add_kobj);
154
155
156
157
158
159struct device_driver *get_driver(struct device_driver *drv)
160{
161 if (drv) {
162 struct driver_private *priv;
163 struct kobject *kobj;
164
165 kobj = kobject_get(&drv->p->kobj);
166 priv = to_driver(kobj);
167 return priv->driver;
168 }
169 return NULL;
170}
171EXPORT_SYMBOL_GPL(get_driver);
172
173
174
175
176
177void put_driver(struct device_driver *drv)
178{
179 kobject_put(&drv->p->kobj);
180}
181EXPORT_SYMBOL_GPL(put_driver);
182
183static int driver_add_groups(struct device_driver *drv,
184 const struct attribute_group **groups)
185{
186 int error = 0;
187 int i;
188
189 if (groups) {
190 for (i = 0; groups[i]; i++) {
191 error = sysfs_create_group(&drv->p->kobj, groups[i]);
192 if (error) {
193 while (--i >= 0)
194 sysfs_remove_group(&drv->p->kobj,
195 groups[i]);
196 break;
197 }
198 }
199 }
200 return error;
201}
202
203static void driver_remove_groups(struct device_driver *drv,
204 const struct attribute_group **groups)
205{
206 int i;
207
208 if (groups)
209 for (i = 0; groups[i]; i++)
210 sysfs_remove_group(&drv->p->kobj, groups[i]);
211}
212
213
214
215
216
217
218
219
220
221int driver_register(struct device_driver *drv)
222{
223 int ret;
224 struct device_driver *other;
225
226 BUG_ON(!drv->bus->p);
227
228 if ((drv->bus->probe && drv->probe) ||
229 (drv->bus->remove && drv->remove) ||
230 (drv->bus->shutdown && drv->shutdown))
231 printk(KERN_WARNING "Driver '%s' needs updating - please use "
232 "bus_type methods\n", drv->name);
233
234 other = driver_find(drv->name, drv->bus);
235 if (other) {
236 put_driver(other);
237 printk(KERN_ERR "Error: Driver '%s' is already registered, "
238 "aborting...\n", drv->name);
239 return -EBUSY;
240 }
241
242 ret = bus_add_driver(drv);
243 if (ret)
244 return ret;
245 ret = driver_add_groups(drv, drv->groups);
246 if (ret)
247 bus_remove_driver(drv);
248 return ret;
249}
250EXPORT_SYMBOL_GPL(driver_register);
251
252
253
254
255
256
257
258void driver_unregister(struct device_driver *drv)
259{
260 if (!drv || !drv->p) {
261 WARN(1, "Unexpected driver unregister!\n");
262 return;
263 }
264 driver_remove_groups(drv, drv->groups);
265 bus_remove_driver(drv);
266}
267EXPORT_SYMBOL_GPL(driver_unregister);
268
269
270
271
272
273
274
275
276
277
278
279struct device_driver *driver_find(const char *name, struct bus_type *bus)
280{
281 struct kobject *k = kset_find_obj(bus->p->drivers_kset, name);
282 struct driver_private *priv;
283
284 if (k) {
285 priv = to_driver(k);
286 return priv->driver;
287 }
288 return NULL;
289}
290EXPORT_SYMBOL_GPL(driver_find);
291