| 1 | |
| 2 | |
| 3 | * module.c - module sysfs fun for drivers
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| 4 |
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| 5 | #include <linux/device.h>
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| 6 | #include <linux/module.h>
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| 7 | #include <linux/errno.h>
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| 8 | #include <linux/slab.h>
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| 9 | #include <linux/string.h>
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| 10 | #include "base.h"
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| 11 |
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| 12 | static char *make_driver_name(const struct device_driver *drv)
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| 13 | {
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| 14 | char *driver_name;
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| 15 |
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| 16 | driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
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| 17 | if (!driver_name)
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| 18 | return NULL;
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| 19 |
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| 20 | return driver_name;
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| 21 | }
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| 22 |
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| 23 | static void module_create_drivers_dir(struct module_kobject *mk)
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| 24 | {
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| 25 | static DEFINE_MUTEX(drivers_dir_mutex);
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| 26 |
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| 27 | mutex_lock(&drivers_dir_mutex);
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| 28 | if (mk && !mk->drivers_dir)
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| 29 | mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
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| 30 | mutex_unlock(&drivers_dir_mutex);
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| 31 | }
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| 32 |
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| 33 | int module_add_driver(struct module *mod, const struct device_driver *drv)
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| 34 | {
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| 35 | char *driver_name;
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| 36 | struct module_kobject *mk = NULL;
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| 37 | int ret;
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| 38 |
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| 39 | if (!drv)
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| 40 | return 0;
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| 41 |
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| 42 | if (mod)
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| 43 | mk = &mod->mkobj;
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| 44 | else if (drv->mod_name) {
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| 45 | struct kobject *mkobj;
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| 46 |
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| 47 |
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| 48 | mkobj = kset_find_obj(module_kset, drv->mod_name);
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| 49 | if (mkobj) {
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| 50 | mk = container_of(mkobj, struct module_kobject, kobj);
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| 51 |
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| 52 | drv->p->mkobj = mk;
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| 53 |
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| 54 | kobject_put(mkobj);
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| 55 | }
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| 56 | }
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| 57 |
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| 58 | if (!mk)
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| 59 | return 0;
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| 60 |
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| 61 | ret = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
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| 62 | if (ret)
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| 63 | return ret;
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| 64 |
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| 65 | driver_name = make_driver_name(drv);
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| 66 | if (!driver_name) {
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| 67 | ret = -ENOMEM;
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| 68 | goto out_remove_kobj;
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| 69 | }
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| 70 |
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| 71 | module_create_drivers_dir(mk);
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| 72 | if (!mk->drivers_dir) {
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| 73 | ret = -EINVAL;
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| 74 | goto out_free_driver_name;
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| 75 | }
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| 76 |
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| 77 | ret = sysfs_create_link(mk->drivers_dir, &drv->p->kobj, driver_name);
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| 78 | if (ret)
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| 79 | goto out_remove_drivers_dir;
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| 80 |
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| 81 | kfree(driver_name);
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| 82 |
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| 83 | return 0;
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| 84 |
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| 85 | out_remove_drivers_dir:
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| 86 | sysfs_remove_link(mk->drivers_dir, driver_name);
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| 87 |
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| 88 | out_free_driver_name:
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| 89 | kfree(driver_name);
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| 90 |
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| 91 | out_remove_kobj:
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| 92 | sysfs_remove_link(&drv->p->kobj, "module");
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| 93 | return ret;
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| 94 | }
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| 95 |
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| 96 | void module_remove_driver(const struct device_driver *drv)
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| 97 | {
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| 98 | struct module_kobject *mk = NULL;
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| 99 | char *driver_name;
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| 100 |
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| 101 | if (!drv)
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| 102 | return;
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| 103 |
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| 104 | sysfs_remove_link(&drv->p->kobj, "module");
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| 105 |
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| 106 | if (drv->owner)
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| 107 | mk = &drv->owner->mkobj;
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| 108 | else if (drv->p->mkobj)
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| 109 | mk = drv->p->mkobj;
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| 110 | if (mk && mk->drivers_dir) {
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| 111 | driver_name = make_driver_name(drv);
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| 112 | if (driver_name) {
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| 113 | sysfs_remove_link(mk->drivers_dir, driver_name);
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| 114 | kfree(driver_name);
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| 115 | }
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| 116 | }
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| 117 | }
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