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