[linux-2.6-block.git] / drivers / base / module.c

/*
 * module.c - module sysfs fun for drivers
 *
 * This file is released under the GPLv2
 *
 */
#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);
		}
	}
}
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	{
7e1b1fc4	27	static DEFINE_MUTEX(drivers_dir_mutex);
c63469a3	28
7e1b1fc4 JS	29	mutex_lock(&drivers_dir_mutex);
	30	if (mk && !mk->drivers_dir)
	31	mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
	32	mutex_unlock(&drivers_dir_mutex);
c63469a3 GKH	33	}
	34
	35	void module_add_driver(struct module mod, struct device_driver drv)
	36	{
	37	char *driver_name;
	38	int no_warn;
	39	struct module_kobject *mk = NULL;
	40
	41	if (!drv)
	42	return;
	43
	44	if (mod)
	45	mk = &mod->mkobj;
	46	else if (drv->mod_name) {
	47	struct kobject *mkobj;
	48
	49	/* Lookup built-in module entry in /sys/modules */
	50	mkobj = kset_find_obj(module_kset, drv->mod_name);
	51	if (mkobj) {
	52	mk = container_of(mkobj, struct module_kobject, kobj);
	53	/* remember our module structure */
e5dd1278	54	drv->p->mkobj = mk;
c63469a3 GKH	55	/* kset_find_obj took a reference */
	56	kobject_put(mkobj);
	57	}
	58	}
	59
	60	if (!mk)
	61	return;
	62
	63	/* Don't check return codes; these calls are idempotent */
e5dd1278	64	no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
c63469a3 GKH	65	driver_name = make_driver_name(drv);
	66	if (driver_name) {
	67	module_create_drivers_dir(mk);
e5dd1278	68	no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,
c63469a3 GKH	69	driver_name);
	70	kfree(driver_name);
	71	}
	72	}
	73
	74	void module_remove_driver(struct device_driver *drv)
	75	{
	76	struct module_kobject *mk = NULL;
	77	char *driver_name;
	78
	79	if (!drv)
	80	return;
	81
e5dd1278	82	sysfs_remove_link(&drv->p->kobj, "module");
c63469a3 GKH	83
	84	if (drv->owner)
	85	mk = &drv->owner->mkobj;
e5dd1278 GKH	86	else if (drv->p->mkobj)
e5dd1278 GKH	87	mk = drv->p->mkobj;
c63469a3 GKH	88	if (mk && mk->drivers_dir) {
	89	driver_name = make_driver_name(drv);
	90	if (driver_name) {
	91	sysfs_remove_link(mk->drivers_dir, driver_name);
	92	kfree(driver_name);
	93	}
	94	}
	95	}