2 * $Id: chipreg.c,v 1.13 2002/02/21 08:26:58 dwmw2 Exp $
4 * Registration for chip drivers
8 #include <linux/kernel.h>
9 #include <linux/config.h>
10 #include <linux/kmod.h>
11 #include <linux/spinlock.h>
12 #include <linux/mtd/compatmac.h>
13 #include <linux/mtd/map.h>
15 spinlock_t chip_drvs_lock = SPIN_LOCK_UNLOCKED;
16 static LIST_HEAD(chip_drvs_list);
18 void register_mtd_chip_driver(struct mtd_chip_driver *drv)
20 spin_lock(&chip_drvs_lock);
21 list_add(&drv->list, &chip_drvs_list);
22 spin_unlock(&chip_drvs_lock);
25 void unregister_mtd_chip_driver(struct mtd_chip_driver *drv)
27 spin_lock(&chip_drvs_lock);
29 spin_unlock(&chip_drvs_lock);
32 static struct mtd_chip_driver *get_mtd_chip_driver (const char *name)
34 struct list_head *pos;
35 struct mtd_chip_driver *ret = NULL, *this;
37 spin_lock(&chip_drvs_lock);
39 list_for_each(pos, &chip_drvs_list) {
40 this = list_entry(pos, typeof(*this), list);
42 if (!strcmp(this->name, name)) {
47 if (ret && !try_inc_mod_count(ret->module)) {
52 spin_unlock(&chip_drvs_lock);
57 /* Hide all the horrid details, like some silly person taking
58 get_module_symbol() away from us, from the caller. */
60 struct mtd_info *do_map_probe(const char *name, struct map_info *map)
62 struct mtd_chip_driver *drv;
65 drv = get_mtd_chip_driver(name);
67 if (!drv && !request_module(name))
68 drv = get_mtd_chip_driver(name);
73 ret = drv->probe(map);
75 /* We decrease the use count here. It may have been a
76 probe-only module, which is no longer required from this
77 point, having given us a handle on (and increased the use
78 count of) the actual driver code.
81 __MOD_DEC_USE_COUNT(drv->module);
90 EXPORT_SYMBOL(register_mtd_chip_driver);
91 EXPORT_SYMBOL(unregister_mtd_chip_driver);
92 EXPORT_SYMBOL(do_map_probe);
94 MODULE_LICENSE("GPL");
95 MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
96 MODULE_DESCRIPTION("Core routines for registering and invoking MTD chip drivers");