projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c63469a3 GKH |
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> | |
| 5a0e3ad6 | 10 | #include <linux/slab.h> |
| c63469a3 GKH |
11 | #include <linux/string.h> |
| 12 | #include "base.h" | |
| 13 | ||
| 14 | static char *make_driver_name(struct device_driver *drv) | |
| 15 | { | |
| 16 | char *driver_name; | |
| 17 | ||
| 1653268b | 18 | driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name); |
| c63469a3 GKH |
19 | if (!driver_name) |
| 20 | return NULL; | |
| 21 | ||
| c63469a3 GKH |
22 | return driver_name; |
| 23 | } | |
| 24 | ||
| 25 | static void module_create_drivers_dir(struct module_kobject *mk) | |
| 26 | { | |
| 27 | if (!mk || mk->drivers_dir) | |
| 28 | return; | |
| 29 | ||
| 30 | mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj); | |
| 31 | } | |
| 32 | ||
| 33 | void module_add_driver(struct module *mod, struct device_driver *drv) | |
| 34 | { | |
| 35 | char *driver_name; | |
| 36 | int no_warn; | |
| 37 | struct module_kobject *mk = NULL; | |
| 38 | ||
| 39 | if (!drv) | |
| 40 | return; | |
| 41 | ||
| 42 | if (mod) | |
| 43 | mk = &mod->mkobj; | |
| 44 | else if (drv->mod_name) { | |
| 45 | struct kobject *mkobj; | |
| 46 | ||
| 47 | /* Lookup built-in module entry in /sys/modules */ | |
| 48 | mkobj = kset_find_obj(module_kset, drv->mod_name); | |
| 49 | if (mkobj) { | |
| 50 | mk = container_of(mkobj, struct module_kobject, kobj); | |
| 51 | /* remember our module structure */ | |
| e5dd1278 | 52 | drv->p->mkobj = mk; |
| c63469a3 GKH |
53 | /* kset_find_obj took a reference */ |
| 54 | kobject_put(mkobj); | |
| 55 | } | |
| 56 | } | |
| 57 | ||
| 58 | if (!mk) | |
| 59 | return; | |
| 60 | ||
| 61 | /* Don't check return codes; these calls are idempotent */ | |
| e5dd1278 | 62 | no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module"); |
| c63469a3 GKH |
63 | driver_name = make_driver_name(drv); |
| 64 | if (driver_name) { | |
| 65 | module_create_drivers_dir(mk); | |
| e5dd1278 | 66 | no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj, |
| c63469a3 GKH |
67 | driver_name); |
| 68 | kfree(driver_name); | |
| 69 | } | |
| 70 | } | |
| 71 | ||
| 72 | void module_remove_driver(struct device_driver *drv) | |
| 73 | { | |
| 74 | struct module_kobject *mk = NULL; | |
| 75 | char *driver_name; | |
| 76 | ||
| 77 | if (!drv) | |
| 78 | return; | |
| 79 | ||
| e5dd1278 | 80 | sysfs_remove_link(&drv->p->kobj, "module"); |
| c63469a3 GKH |
81 | |
| 82 | if (drv->owner) | |
| 83 | mk = &drv->owner->mkobj; | |
| e5dd1278 GKH |
84 | else if (drv->p->mkobj) |
| 85 | mk = drv->p->mkobj; | |
| c63469a3 GKH |
86 | if (mk && mk->drivers_dir) { |
| 87 | driver_name = make_driver_name(drv); | |
| 88 | if (driver_name) { | |
| 89 | sysfs_remove_link(mk->drivers_dir, driver_name); | |
| 90 | kfree(driver_name); | |
| 91 | } | |
| 92 | } | |
| 93 | } |