patch-2.4.6 linux/drivers/mtd/chips/chipreg.c

• Lines: 93
• Date: Tue Jun 12 10:30:27 2001
• Orig file: v2.4.5/linux/drivers/mtd/chips/chipreg.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/mtd/chips/chipreg.c linux/drivers/mtd/chips/chipreg.c
@@ -0,0 +1,92 @@
+/*
+ * $Id: chipreg.c,v 1.8 2001/06/09 19:58:19 dwmw2 Exp $
+ *
+ * Registration for chip drivers
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/config.h>
+#include <linux/kmod.h>
+#include <linux/spinlock.h>
+#include <linux/mtd/compatmac.h>
+#include <linux/mtd/map.h>
+
+spinlock_t chip_drvs_lock = SPIN_LOCK_UNLOCKED;
+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 (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_inc_mod_count(ret->module)) {
+		/* Eep. Failed. */
+		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(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(name))
+		drv = get_mtd_chip_driver(name);
+
+	if (!drv)
+		return NULL;
+
+	ret = drv->probe(map);
+#ifdef CONFIG_MODULES
+	/* 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.
+	*/
+	if(drv->module)
+		__MOD_DEC_USE_COUNT(drv->module);
+#endif
+
+	if (ret)
+		return ret;
+	
+	return NULL;
+}
+
+EXPORT_SYMBOL(register_mtd_chip_driver);
+EXPORT_SYMBOL(unregister_mtd_chip_driver);
+EXPORT_SYMBOL(do_map_probe);