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