| 1 | |
| 2 | * module.c - module sysfs fun for drivers
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| 3 | *
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| 4 | * This file is released under the GPLv2
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| 5 | *
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| 6 |
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| 7 | #include <linux/device.h>
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| 8 | #include <linux/module.h>
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| 9 | #include <linux/errno.h>
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| 10 | #include <linux/slab.h>
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| 11 | #include <linux/string.h>
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| 12 | #include "base.h"
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| 13 |
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| 14 | static char *make_driver_name(struct device_driver *drv)
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| 15 | {
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| 16 | char *driver_name;
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| 17 |
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| 18 | driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
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| 19 | if (!driver_name)
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| 20 | return NULL;
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| 21 |
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| 22 | return driver_name;
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| 23 | }
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| 24 |
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| 25 | static void module_create_drivers_dir(struct module_kobject *mk)
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| 26 | {
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| 27 | if (!mk || mk->drivers_dir)
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| 28 | return;
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| 29 |
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| 30 | mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
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| 31 | }
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| 32 |
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| 33 | void module_add_driver(struct module *mod, struct device_driver *drv)
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| 34 | {
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| 35 | char *driver_name;
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| 36 | int no_warn;
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| 37 | struct module_kobject *mk = NULL;
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| 38 |
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| 39 | if (!drv)
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| 40 | return;
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| 41 |
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| 42 | if (mod)
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| 43 | mk = &mod->mkobj;
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| 44 | else if (drv->mod_name) {
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| 45 | struct kobject *mkobj;
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| 46 |
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| 47 |
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| 48 | mkobj = kset_find_obj(module_kset, drv->mod_name);
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| 49 | if (mkobj) {
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| 50 | mk = container_of(mkobj, struct module_kobject, kobj);
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| 51 |
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| 52 | drv->p->mkobj = mk;
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| 53 |
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| 54 | kobject_put(mkobj);
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| 55 | }
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| 56 | }
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| 57 |
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| 58 | if (!mk)
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| 59 | return;
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| 60 |
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| 61 |
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| 62 | no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
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| 63 | driver_name = make_driver_name(drv);
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| 64 | if (driver_name) {
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| 65 | module_create_drivers_dir(mk);
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| 66 | no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,
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| 67 | driver_name);
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| 68 | kfree(driver_name);
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| 69 | }
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| 70 | }
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| 71 |
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| 72 | void module_remove_driver(struct device_driver *drv)
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| 73 | {
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| 74 | struct module_kobject *mk = NULL;
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| 75 | char *driver_name;
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| 76 |
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| 77 | if (!drv)
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| 78 | return;
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| 79 |
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| 80 | sysfs_remove_link(&drv->p->kobj, "module");
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| 81 |
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| 82 | if (drv->owner)
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| 83 | mk = &drv->owner->mkobj;
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| 84 | else if (drv->p->mkobj)
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| 85 | mk = drv->p->mkobj;
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| 86 | if (mk && mk->drivers_dir) {
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| 87 | driver_name = make_driver_name(drv);
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| 88 | if (driver_name) {
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| 89 | sysfs_remove_link(mk->drivers_dir, driver_name);
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| 90 | kfree(driver_name);
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| 91 | }
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| 92 | }
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| 93 | }
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