Driver core: move the static kobject out of struct driver
[linux-2.6.git] / drivers / base / module.c
1 /*
2  * module.c - module sysfs fun for drivers
3  *
4  * This file is released under the GPLv2
5  *
6  */
7 #include <linux/device.h>
8 #include <linux/module.h>
9 #include <linux/errno.h>
10 #include <linux/string.h>
11 #include "base.h"
12
13 static char *make_driver_name(struct device_driver *drv)
14 {
15         char *driver_name;
16
17         driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2,
18                               GFP_KERNEL);
19         if (!driver_name)
20                 return NULL;
21
22         sprintf(driver_name, "%s:%s", drv->bus->name, drv->name);
23         return driver_name;
24 }
25
26 static void module_create_drivers_dir(struct module_kobject *mk)
27 {
28         if (!mk || mk->drivers_dir)
29                 return;
30
31         mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
32 }
33
34 void module_add_driver(struct module *mod, struct device_driver *drv)
35 {
36         char *driver_name;
37         int no_warn;
38         struct module_kobject *mk = NULL;
39
40         if (!drv)
41                 return;
42
43         if (mod)
44                 mk = &mod->mkobj;
45         else if (drv->mod_name) {
46                 struct kobject *mkobj;
47
48                 /* Lookup built-in module entry in /sys/modules */
49                 mkobj = kset_find_obj(module_kset, drv->mod_name);
50                 if (mkobj) {
51                         mk = container_of(mkobj, struct module_kobject, kobj);
52                         /* remember our module structure */
53                         drv->p->mkobj = mk;
54                         /* kset_find_obj took a reference */
55                         kobject_put(mkobj);
56                 }
57         }
58
59         if (!mk)
60                 return;
61
62         /* Don't check return codes; these calls are idempotent */
63         no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
64         driver_name = make_driver_name(drv);
65         if (driver_name) {
66                 module_create_drivers_dir(mk);
67                 no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,
68                                             driver_name);
69                 kfree(driver_name);
70         }
71 }
72
73 void module_remove_driver(struct device_driver *drv)
74 {
75         struct module_kobject *mk = NULL;
76         char *driver_name;
77
78         if (!drv)
79                 return;
80
81         sysfs_remove_link(&drv->p->kobj, "module");
82
83         if (drv->owner)
84                 mk = &drv->owner->mkobj;
85         else if (drv->p->mkobj)
86                 mk = drv->p->mkobj;
87         if (mk && mk->drivers_dir) {
88                 driver_name = make_driver_name(drv);
89                 if (driver_name) {
90                         sysfs_remove_link(mk->drivers_dir, driver_name);
91                         kfree(driver_name);
92                 }
93         }
94 }