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