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105 lines
2.3 KiB
105 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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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return ret; |
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("Core routines for registering and invoking MTD chip drivers");
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