projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 | 1 | /* |
| 1da177e4 LT |
2 | * Registration for chip drivers |
| 3 | * | |
| 4 | */ | |
| 5 | ||
| 6 | #include <linux/kernel.h> | |
| 1da177e4 LT |
7 | #include <linux/module.h> |
| 8 | #include <linux/kmod.h> | |
| 9 | #include <linux/spinlock.h> | |
| 10 | #include <linux/slab.h> | |
| 11 | #include <linux/mtd/map.h> | |
| 12 | #include <linux/mtd/mtd.h> | |
| 13 | #include <linux/mtd/compatmac.h> | |
| 14 | ||
| 15 | static DEFINE_SPINLOCK(chip_drvs_lock); | |
| 16 | static LIST_HEAD(chip_drvs_list); | |
| 17 | ||
| 18 | void register_mtd_chip_driver(struct mtd_chip_driver *drv) | |
| 19 | { | |
| 20 | spin_lock(&chip_drvs_lock); | |
| 21 | list_add(&drv->list, &chip_drvs_list); | |
| 22 | spin_unlock(&chip_drvs_lock); | |
| 23 | } | |
| 24 | ||
| 25 | void unregister_mtd_chip_driver(struct mtd_chip_driver *drv) | |
| 26 | { | |
| 27 | spin_lock(&chip_drvs_lock); | |
| 28 | list_del(&drv->list); | |
| 29 | spin_unlock(&chip_drvs_lock); | |
| 30 | } | |
| 31 | ||
| 32 | static struct mtd_chip_driver *get_mtd_chip_driver (const char *name) | |
| 33 | { | |
| 34 | struct list_head *pos; | |
| 35 | struct mtd_chip_driver *ret = NULL, *this; | |
| 36 | ||
| 37 | spin_lock(&chip_drvs_lock); | |
| 38 | ||
| 39 | list_for_each(pos, &chip_drvs_list) { | |
| 40 | this = list_entry(pos, typeof(*this), list); | |
| 1f948b43 | 41 | |
| 1da177e4 LT |
42 | if (!strcmp(this->name, name)) { |
| 43 | ret = this; | |
| 44 | break; | |
| 45 | } | |
| 46 | } | |
| 47 | if (ret && !try_module_get(ret->module)) | |
| 48 | ret = NULL; | |
| 49 | ||
| 50 | spin_unlock(&chip_drvs_lock); | |
| 51 | ||
| 52 | return ret; | |
| 53 | } | |
| 54 | ||
| 55 | /* Hide all the horrid details, like some silly person taking | |
| 56 | get_module_symbol() away from us, from the caller. */ | |
| 57 | ||
| 58 | struct mtd_info *do_map_probe(const char *name, struct map_info *map) | |
| 59 | { | |
| 60 | struct mtd_chip_driver *drv; | |
| 61 | struct mtd_info *ret; | |
| 62 | ||
| 63 | drv = get_mtd_chip_driver(name); | |
| 64 | ||
| 65 | if (!drv && !request_module("%s", name)) | |
| 66 | drv = get_mtd_chip_driver(name); | |
| 67 | ||
| 68 | if (!drv) | |
| 69 | return NULL; | |
| 70 | ||
| 71 | ret = drv->probe(map); | |
| 72 | ||
| 1f948b43 | 73 | /* We decrease the use count here. It may have been a |
| 1da177e4 LT |
74 | probe-only module, which is no longer required from this |
| 75 | point, having given us a handle on (and increased the use | |
| 76 | count of) the actual driver code. | |
| 77 | */ | |
| 78 | module_put(drv->module); | |
| 79 | ||
| 80 | if (ret) | |
| 81 | return ret; | |
| 1f948b43 | 82 | |
| 1da177e4 LT |
83 | return NULL; |
| 84 | } | |
| 85 | /* | |
| 86 | * Destroy an MTD device which was created for a map device. | |
| 87 | * Make sure the MTD device is already unregistered before calling this | |
| 88 | */ | |
| 89 | void map_destroy(struct mtd_info *mtd) | |
| 90 | { | |
| 91 | struct map_info *map = mtd->priv; | |
| 92 | ||
| 93 | if (map->fldrv->destroy) | |
| 94 | map->fldrv->destroy(mtd); | |
| 95 | ||
| 96 | module_put(map->fldrv->module); | |
| 97 | ||
| 98 | kfree(mtd); | |
| 99 | } | |
| 100 | ||
| 101 | EXPORT_SYMBOL(register_mtd_chip_driver); | |
| 102 | EXPORT_SYMBOL(unregister_mtd_chip_driver); | |
| 103 | EXPORT_SYMBOL(do_map_probe); | |
| 104 | EXPORT_SYMBOL(map_destroy); | |
| 105 | ||
| 106 | MODULE_LICENSE("GPL"); | |
| 107 | MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>"); | |
| 108 | MODULE_DESCRIPTION("Core routines for registering and invoking MTD chip drivers"); |