106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Registration for chip drivers
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mtd/map.h>
|
|
#include <linux/mtd/mtd.h>
|
|
|
|
static DEFINE_SPINLOCK(chip_drvs_lock);
|
|
static LIST_HEAD(chip_drvs_list);
|
|
|
|
void register_mtd_chip_driver(struct mtd_chip_driver *drv)
|
|
{
|
|
spin_lock(&chip_drvs_lock);
|
|
list_add(&drv->list, &chip_drvs_list);
|
|
spin_unlock(&chip_drvs_lock);
|
|
}
|
|
|
|
void unregister_mtd_chip_driver(struct mtd_chip_driver *drv)
|
|
{
|
|
spin_lock(&chip_drvs_lock);
|
|
list_del(&drv->list);
|
|
spin_unlock(&chip_drvs_lock);
|
|
}
|
|
|
|
static struct mtd_chip_driver *get_mtd_chip_driver (const char *name)
|
|
{
|
|
struct list_head *pos;
|
|
struct mtd_chip_driver *ret = NULL, *this;
|
|
|
|
spin_lock(&chip_drvs_lock);
|
|
|
|
list_for_each(pos, &chip_drvs_list) {
|
|
this = list_entry(pos, typeof(*this), list);
|
|
|
|
if (!strcmp(this->name, name)) {
|
|
ret = this;
|
|
break;
|
|
}
|
|
}
|
|
if (ret && !try_module_get(ret->module))
|
|
ret = NULL;
|
|
|
|
spin_unlock(&chip_drvs_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Hide all the horrid details, like some silly person taking
|
|
get_module_symbol() away from us, from the caller. */
|
|
|
|
struct mtd_info *do_map_probe(const char *name, struct map_info *map)
|
|
{
|
|
struct mtd_chip_driver *drv;
|
|
struct mtd_info *ret;
|
|
|
|
drv = get_mtd_chip_driver(name);
|
|
|
|
if (!drv && !request_module("%s", name))
|
|
drv = get_mtd_chip_driver(name);
|
|
|
|
if (!drv)
|
|
return NULL;
|
|
|
|
ret = drv->probe(map);
|
|
|
|
/* We decrease the use count here. It may have been a
|
|
probe-only module, which is no longer required from this
|
|
point, having given us a handle on (and increased the use
|
|
count of) the actual driver code.
|
|
*/
|
|
module_put(drv->module);
|
|
|
|
return ret;
|
|
}
|
|
/*
|
|
* Destroy an MTD device which was created for a map device.
|
|
* Make sure the MTD device is already unregistered before calling this
|
|
*/
|
|
void map_destroy(struct mtd_info *mtd)
|
|
{
|
|
struct map_info *map = mtd->priv;
|
|
|
|
if (map->fldrv->destroy)
|
|
map->fldrv->destroy(mtd);
|
|
|
|
module_put(map->fldrv->module);
|
|
|
|
kfree(mtd);
|
|
}
|
|
|
|
EXPORT_SYMBOL(register_mtd_chip_driver);
|
|
EXPORT_SYMBOL(unregister_mtd_chip_driver);
|
|
EXPORT_SYMBOL(do_map_probe);
|
|
EXPORT_SYMBOL(map_destroy);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
|
|
MODULE_DESCRIPTION("Core routines for registering and invoking MTD chip drivers");
|