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93 lines
2.0 KiB
93 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* module.c - module sysfs fun for drivers |
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*/ |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/slab.h> |
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#include <linux/string.h> |
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#include "base.h" |
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static char *make_driver_name(struct device_driver *drv) |
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{ |
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char *driver_name; |
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driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name); |
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if (!driver_name) |
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return NULL; |
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return driver_name; |
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} |
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static void module_create_drivers_dir(struct module_kobject *mk) |
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{ |
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static DEFINE_MUTEX(drivers_dir_mutex); |
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mutex_lock(&drivers_dir_mutex); |
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if (mk && !mk->drivers_dir) |
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mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj); |
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mutex_unlock(&drivers_dir_mutex); |
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} |
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void module_add_driver(struct module *mod, struct device_driver *drv) |
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{ |
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char *driver_name; |
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int no_warn; |
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struct module_kobject *mk = NULL; |
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if (!drv) |
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return; |
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if (mod) |
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mk = &mod->mkobj; |
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else if (drv->mod_name) { |
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struct kobject *mkobj; |
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/* Lookup built-in module entry in /sys/modules */ |
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mkobj = kset_find_obj(module_kset, drv->mod_name); |
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if (mkobj) { |
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mk = container_of(mkobj, struct module_kobject, kobj); |
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/* remember our module structure */ |
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drv->p->mkobj = mk; |
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/* kset_find_obj took a reference */ |
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kobject_put(mkobj); |
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} |
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} |
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if (!mk) |
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return; |
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/* Don't check return codes; these calls are idempotent */ |
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no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module"); |
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driver_name = make_driver_name(drv); |
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if (driver_name) { |
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module_create_drivers_dir(mk); |
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no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj, |
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driver_name); |
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kfree(driver_name); |
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} |
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} |
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void module_remove_driver(struct device_driver *drv) |
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{ |
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struct module_kobject *mk = NULL; |
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char *driver_name; |
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if (!drv) |
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return; |
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sysfs_remove_link(&drv->p->kobj, "module"); |
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if (drv->owner) |
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mk = &drv->owner->mkobj; |
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else if (drv->p->mkobj) |
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mk = drv->p->mkobj; |
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if (mk && mk->drivers_dir) { |
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driver_name = make_driver_name(drv); |
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if (driver_name) { |
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sysfs_remove_link(mk->drivers_dir, driver_name); |
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kfree(driver_name); |
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} |
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} |
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}
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