diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/base/Makefile | 1 | ||||
| -rw-r--r-- | drivers/base/base.h | 9 | ||||
| -rw-r--r-- | drivers/base/module.c | 94 |
3 files changed, 104 insertions, 0 deletions
diff --git a/drivers/base/Makefile b/drivers/base/Makefile index b39ea3f59c9..ff2696823f8 100644 --- a/drivers/base/Makefile +++ b/drivers/base/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_FW_LOADER) += firmware_class.o obj-$(CONFIG_NUMA) += node.o obj-$(CONFIG_MEMORY_HOTPLUG_SPARSE) += memory.o obj-$(CONFIG_SMP) += topology.o +obj-$(CONFIG_MODULES) += module.o obj-$(CONFIG_SYS_HYPERVISOR) += hypervisor.o ifeq ($(CONFIG_DEBUG_DRIVER),y) diff --git a/drivers/base/base.h b/drivers/base/base.h index ca6d273064f..05472360f6a 100644 --- a/drivers/base/base.h +++ b/drivers/base/base.h @@ -73,3 +73,12 @@ extern char *make_class_name(const char *name, struct kobject *kobj); extern int devres_release_all(struct device *dev); extern struct kset *devices_kset; + +#ifdef CONFIG_MODULES +extern void module_add_driver(struct module *mod, struct device_driver *drv); +extern void module_remove_driver(struct device_driver *drv); +#else +static inline void module_add_driver(struct module *mod, + struct device_driver *drv) { } +static inline void module_remove_driver(struct device_driver *drv) { } +#endif diff --git a/drivers/base/module.c b/drivers/base/module.c new file mode 100644 index 00000000000..cad07be5de1 --- /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); + } + } +} |