Driver core: move the driver specific module code into the driver core

[pandora-kernel.git] / drivers / base / module.c

diff --git a/drivers/base/module.c b/drivers/base/module.c
new file mode 100644 (file)
index 0000000..cad07be
--- /dev/null
+++ b/drivers/base/module.c
@@ -0,0 +1,94 @@
+/*
+ * module.c - module sysfs fun for drivers
+ *
+ * This file is released under the GPLv2
+ *
+ */
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include "base.h"
+
+static char *make_driver_name(struct device_driver *drv)
+{
+       char *driver_name;
+
+       driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2,
+                             GFP_KERNEL);
+       if (!driver_name)
+               return NULL;
+
+       sprintf(driver_name, "%s:%s", drv->bus->name, drv->name);
+       return driver_name;
+}
+
+static void module_create_drivers_dir(struct module_kobject *mk)
+{
+       if (!mk || mk->drivers_dir)
+               return;
+
+       mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
+}
+
+void module_add_driver(struct module *mod, struct device_driver *drv)
+{
+       char *driver_name;
+       int no_warn;
+       struct module_kobject *mk = NULL;
+
+       if (!drv)
+               return;
+
+       if (mod)
+               mk = &mod->mkobj;
+       else if (drv->mod_name) {
+               struct kobject *mkobj;
+
+               /* Lookup built-in module entry in /sys/modules */
+               mkobj = kset_find_obj(module_kset, drv->mod_name);
+               if (mkobj) {
+                       mk = container_of(mkobj, struct module_kobject, kobj);
+                       /* remember our module structure */
+                       drv->mkobj = mk;
+                       /* kset_find_obj took a reference */
+                       kobject_put(mkobj);
+               }
+       }
+
+       if (!mk)
+               return;
+
+       /* Don't check return codes; these calls are idempotent */
+       no_warn = sysfs_create_link(&drv->kobj, &mk->kobj, "module");
+       driver_name = make_driver_name(drv);
+       if (driver_name) {
+               module_create_drivers_dir(mk);
+               no_warn = sysfs_create_link(mk->drivers_dir, &drv->kobj,
+                                           driver_name);
+               kfree(driver_name);
+       }
+}
+
+void module_remove_driver(struct device_driver *drv)
+{
+       struct module_kobject *mk = NULL;
+       char *driver_name;
+
+       if (!drv)
+               return;
+
+       sysfs_remove_link(&drv->kobj, "module");
+
+       if (drv->owner)
+               mk = &drv->owner->mkobj;
+       else if (drv->mkobj)
+               mk = drv->mkobj;
+       if (mk && mk->drivers_dir) {
+               driver_name = make_driver_name(drv);
+               if (driver_name) {
+                       sysfs_remove_link(mk->drivers_dir, driver_name);
+                       kfree(driver_name);
+               }
+       }
+}