1 files changed, 111 insertions, 0 deletions

diff --git a/drivers/mtd/chips/chipreg.c b/drivers/mtd/chips/chipreg.c
new file mode 100644
index 000000000000..d7d739a108ae
--- /dev/null
+++ b/drivers/mtd/chips/chipreg.c
@@ -0,0 +1,111 @@
+/*
+ * $Id: chipreg.c,v 1.17 2004/11/16 18:29:00 dwmw2 Exp $
+ *
+ * Registration for chip drivers
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kmod.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/mtd/map.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/compatmac.h>
+
+static DEFINE_SPINLOCK(chip_drvs_lock);
+static LIST_HEAD(chip_drvs_list);
+
+void register_mtd_chip_driver(struct mtd_chip_driver *drv)
+{
+        spin_lock(&chip_drvs_lock);
+        list_add(&drv->list, &chip_drvs_list);
+        spin_unlock(&chip_drvs_lock);
+}
+
+void unregister_mtd_chip_driver(struct mtd_chip_driver *drv)
+{
+        spin_lock(&chip_drvs_lock);
+        list_del(&drv->list);
+        spin_unlock(&chip_drvs_lock);
+}
+
+static struct mtd_chip_driver *get_mtd_chip_driver (const char *name)
+{
+        struct list_head *pos;
+        struct mtd_chip_driver *ret = NULL, *this;
+
+        spin_lock(&chip_drvs_lock);
+
+        list_for_each(pos, &chip_drvs_list) {
+                this = list_entry(pos, typeof(*this), list);
+                
+                if (!strcmp(this->name, name)) {
+                        ret = this;
+                        break;
+                }
+        }
+        if (ret && !try_module_get(ret->module))
+                ret = NULL;
+
+        spin_unlock(&chip_drvs_lock);
+
+        return ret;
+}
+
+        /* Hide all the horrid details, like some silly person taking
+           get_module_symbol() away from us, from the caller. */
+
+struct mtd_info *do_map_probe(const char *name, struct map_info *map)
+{
+        struct mtd_chip_driver *drv;
+        struct mtd_info *ret;
+
+        drv = get_mtd_chip_driver(name);
+
+        if (!drv && !request_module("%s", name))
+                drv = get_mtd_chip_driver(name);
+
+        if (!drv)
+                return NULL;
+
+        ret = drv->probe(map);
+
+        /* We decrease the use count here. It may have been a 
+           probe-only module, which is no longer required from this
+           point, having given us a handle on (and increased the use
+           count of) the actual driver code.
+        */
+        module_put(drv->module);
+
+        if (ret)
+                return ret;
+        
+        return NULL;
+}
+/*
+ * Destroy an MTD device which was created for a map device.
+ * Make sure the MTD device is already unregistered before calling this
+ */
+void map_destroy(struct mtd_info *mtd)
+{
+        struct map_info *map = mtd->priv;
+
+        if (map->fldrv->destroy)
+                map->fldrv->destroy(mtd);
+
+        module_put(map->fldrv->module);
+
+        kfree(mtd);
+}
+
+EXPORT_SYMBOL(register_mtd_chip_driver);
+EXPORT_SYMBOL(unregister_mtd_chip_driver);
+EXPORT_SYMBOL(do_map_probe);
+EXPORT_SYMBOL(map_destroy);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("David Woodhouse <dwmw2@infradead.org>");
+MODULE_DESCRIPTION("Core routines for registering and invoking MTD chip drivers");