Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * module.c - module sysfs fun for drivers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) #include <linux/device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include "base.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) static char *make_driver_name(struct device_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 	char *driver_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	if (!driver_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 		return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	return driver_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) static void module_create_drivers_dir(struct module_kobject *mk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	static DEFINE_MUTEX(drivers_dir_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	mutex_lock(&drivers_dir_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	if (mk && !mk->drivers_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		mk->drivers_dir = kobject_create_and_add("drivers", &mk->kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	mutex_unlock(&drivers_dir_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) void module_add_driver(struct module *mod, struct device_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	char *driver_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	int no_warn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	struct module_kobject *mk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	if (!drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	if (mod)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 		mk = &mod->mkobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	else if (drv->mod_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		struct kobject *mkobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		/* Lookup built-in module entry in /sys/modules */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 		mkobj = kset_find_obj(module_kset, drv->mod_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		if (mkobj) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 			mk = container_of(mkobj, struct module_kobject, kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 			/* remember our module structure */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 			drv->p->mkobj = mk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 			/* kset_find_obj took a reference */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 			kobject_put(mkobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	if (!mk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	/* Don't check return codes; these calls are idempotent */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	no_warn = sysfs_create_link(&drv->p->kobj, &mk->kobj, "module");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	driver_name = make_driver_name(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	if (driver_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 		module_create_drivers_dir(mk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 		no_warn = sysfs_create_link(mk->drivers_dir, &drv->p->kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 					    driver_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 		kfree(driver_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) void module_remove_driver(struct device_driver *drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	struct module_kobject *mk = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	char *driver_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	if (!drv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	sysfs_remove_link(&drv->p->kobj, "module");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	if (drv->owner)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 		mk = &drv->owner->mkobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 	else if (drv->p->mkobj)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 		mk = drv->p->mkobj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	if (mk && mk->drivers_dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 		driver_name = make_driver_name(drv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 		if (driver_name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 			sysfs_remove_link(mk->drivers_dir, driver_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 			kfree(driver_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) }