/*
- * $Id: mtdcore.c,v 1.47 2005/11/07 11:14:20 gleixner Exp $
- *
* Core registration and callback routines for MTD
* drivers and users.
*
#include <linux/module.h>
#include <linux/kernel.h>
-#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/major.h>
#include <linux/fs.h>
+#include <linux/err.h>
#include <linux/ioctl.h>
#include <linux/init.h>
#include <linux/mtd/compatmac.h>
#include <linux/mtd/mtd.h>
+#include "mtdcore.h"
+
/* These are exported solely for the purpose of mtd_blkdevs.c. You
should not use them for _anything_ else */
DEFINE_MUTEX(mtd_table_mutex);
for (i=0; i < MAX_MTD_DEVICES; i++)
if (!mtd_table[i]) {
- struct list_head *this;
+ struct mtd_notifier *not;
mtd_table[i] = mtd;
mtd->index = i;
/* Some chips always power up locked. Unlock them now */
if ((mtd->flags & MTD_WRITEABLE)
- && (mtd->flags & MTD_STUPID_LOCK) && mtd->unlock) {
+ && (mtd->flags & MTD_POWERUP_LOCK) && mtd->unlock) {
if (mtd->unlock(mtd, 0, mtd->size))
printk(KERN_WARNING
"%s: unlock failed, "
DEBUG(0, "mtd: Giving out device %d to %s\n",i, mtd->name);
/* No need to get a refcount on the module containing
the notifier, since we hold the mtd_table_mutex */
- list_for_each(this, &mtd_notifiers) {
- struct mtd_notifier *not = list_entry(this, struct mtd_notifier, list);
+ list_for_each_entry(not, &mtd_notifiers, list)
not->add(mtd);
- }
mutex_unlock(&mtd_table_mutex);
/* We _know_ we aren't being removed, because
mtd->index, mtd->name, mtd->usecount);
ret = -EBUSY;
} else {
- struct list_head *this;
+ struct mtd_notifier *not;
/* No need to get a refcount on the module containing
the notifier, since we hold the mtd_table_mutex */
- list_for_each(this, &mtd_notifiers) {
- struct mtd_notifier *not = list_entry(this, struct mtd_notifier, list);
+ list_for_each_entry(not, &mtd_notifiers, list)
not->remove(mtd);
- }
mtd_table[mtd->index] = NULL;
* Given a number and NULL address, return the num'th entry in the device
* table, if any. Given an address and num == -1, search the device table
* for a device with that address and return if it's still present. Given
- * both, return the num'th driver only if its address matches. Return NULL
- * if not.
+ * both, return the num'th driver only if its address matches. Return
+ * error code if not.
*/
struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num)
{
struct mtd_info *ret = NULL;
- int i;
+ int i, err = -ENODEV;
mutex_lock(&mtd_table_mutex);
ret = NULL;
}
- if (ret && !try_module_get(ret->owner))
- ret = NULL;
+ if (!ret)
+ goto out_unlock;
+
+ if (!try_module_get(ret->owner))
+ goto out_unlock;
- if (ret)
- ret->usecount++;
+ if (ret->get_device) {
+ err = ret->get_device(ret);
+ if (err)
+ goto out_put;
+ }
+ ret->usecount++;
mutex_unlock(&mtd_table_mutex);
return ret;
+
+out_put:
+ module_put(ret->owner);
+out_unlock:
+ mutex_unlock(&mtd_table_mutex);
+ return ERR_PTR(err);
+}
+
+/**
+ * get_mtd_device_nm - obtain a validated handle for an MTD device by
+ * device name
+ * @name: MTD device name to open
+ *
+ * This function returns MTD device description structure in case of
+ * success and an error code in case of failure.
+ */
+
+struct mtd_info *get_mtd_device_nm(const char *name)
+{
+ int i, err = -ENODEV;
+ struct mtd_info *mtd = NULL;
+
+ mutex_lock(&mtd_table_mutex);
+
+ for (i = 0; i < MAX_MTD_DEVICES; i++) {
+ if (mtd_table[i] && !strcmp(name, mtd_table[i]->name)) {
+ mtd = mtd_table[i];
+ break;
+ }
+ }
+
+ if (!mtd)
+ goto out_unlock;
+
+ if (!try_module_get(mtd->owner))
+ goto out_unlock;
+
+ if (mtd->get_device) {
+ err = mtd->get_device(mtd);
+ if (err)
+ goto out_put;
+ }
+
+ mtd->usecount++;
+ mutex_unlock(&mtd_table_mutex);
+ return mtd;
+
+out_put:
+ module_put(mtd->owner);
+out_unlock:
+ mutex_unlock(&mtd_table_mutex);
+ return ERR_PTR(err);
}
void put_mtd_device(struct mtd_info *mtd)
mutex_lock(&mtd_table_mutex);
c = --mtd->usecount;
+ if (mtd->put_device)
+ mtd->put_device(mtd);
mutex_unlock(&mtd_table_mutex);
BUG_ON(c < 0);
}
/* default_mtd_writev - default mtd writev method for MTD devices that
- * dont implement their own
+ * don't implement their own
*/
int default_mtd_writev(struct mtd_info *mtd, const struct kvec *vecs,
return ret;
}
-EXPORT_SYMBOL(add_mtd_device);
-EXPORT_SYMBOL(del_mtd_device);
-EXPORT_SYMBOL(get_mtd_device);
-EXPORT_SYMBOL(put_mtd_device);
-EXPORT_SYMBOL(register_mtd_user);
-EXPORT_SYMBOL(unregister_mtd_user);
-EXPORT_SYMBOL(default_mtd_writev);
+EXPORT_SYMBOL_GPL(add_mtd_device);
+EXPORT_SYMBOL_GPL(del_mtd_device);
+EXPORT_SYMBOL_GPL(get_mtd_device);
+EXPORT_SYMBOL_GPL(get_mtd_device_nm);
+EXPORT_SYMBOL_GPL(put_mtd_device);
+EXPORT_SYMBOL_GPL(register_mtd_user);
+EXPORT_SYMBOL_GPL(unregister_mtd_user);
+EXPORT_SYMBOL_GPL(default_mtd_writev);
#ifdef CONFIG_PROC_FS
projects / linux-2.6-omap-h63xx.git / blobdiff