94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
/*
|
||
|
|
* module.c - module sysfs fun for drivers
|
||
|
|
*/
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/slab.h>
|
||
|
|
#include <linux/string.h>
|
||
|
|
#include "base.h"
|
||
|
|
|
||
|
|
static char *make_driver_name(struct device_driver *drv)
|
||
|
|
{
|
||
|
|
char *driver_name;
|
||
|
|
|
||
|
|
driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
|
||
|
|
if (!driver_name)
|
||
|
|
return NULL;
|
||
|
|
|
||
|
|
return driver_name;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void module_create_drivers_dir(struct module_kobject *mk)
|
||
|
|
{
|
||
|
|
static DEFINE_MUTEX(drivers_dir_mutex);
|
||
|
|
|
||
|
|
mutex_lock(&drivers_dir_mutex);
|
||
|
|
if (mk && !mk->drivers_dir)
|
||
|
|
mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
|
||
|
|
mutex_unlock(&drivers_dir_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
void module_add_driver(struct module *mod, struct device_driver *drv)
|
||
|
|
{
|
||
|
|
char *driver_name;
|
||
|
|
int no_warn;
|
||
|
|
struct module_kobject *mk = NULL;
|
||
|
|
|
||
|
|
if (!drv)
|
||
|
|
return;
|
||
|
|
|
||
|
|
if (mod)
|
||
|
|
mk = &mod->mkobj;
|
||
|
|
else if (drv->mod_name) {
|
||
|
|
struct kobject *mkobj;
|
||
|
|
|
||
|
|
/* Lookup built-in module entry in /sys/modules */
|
||
|
|
mkobj = kset_find_obj(module_kset, drv->mod_name);
|
||
|
|
if (mkobj) {
|
||
|
|
mk = container_of(mkobj, struct module_kobject, kobj);
|
||
|
|
/* remember our module structure */
|
||
|
|
drv->p->mkobj = mk;
|
||
|
|
/* kset_find_obj took a reference */
|
||
|
|
kobject_put(mkobj);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!mk)
|
||
|
|
return;
|
||
|
|
|
||
|
|
/* Don't check return codes; these calls are idempotent */
|
||
|
|
no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
|
||
|
|
driver_name = make_driver_name(drv);
|
||
|
|
if (driver_name) {
|
||
|
|
module_create_drivers_dir(mk);
|
||
|
|
no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,
|
||
|
|
driver_name);
|
||
|
|
kfree(driver_name);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void module_remove_driver(struct device_driver *drv)
|
||
|
|
{
|
||
|
|
struct module_kobject *mk = NULL;
|
||
|
|
char *driver_name;
|
||
|
|
|
||
|
|
if (!drv)
|
||
|
|
return;
|
||
|
|
|
||
|
|
sysfs_remove_link(&drv->p->kobj, "module");
|
||
|
|
|
||
|
|
if (drv->owner)
|
||
|
|
mk = &drv->owner->mkobj;
|
||
|
|
else if (drv->p->mkobj)
|
||
|
|
mk = drv->p->mkobj;
|
||
|
|
if (mk && mk->drivers_dir) {
|
||
|
|
driver_name = make_driver_name(drv);
|
||
|
|
if (driver_name) {
|
||
|
|
sysfs_remove_link(mk->drivers_dir, driver_name);
|
||
|
|
kfree(driver_name);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|