1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> 4 * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> 5 * Copyright (c) 2008-2012 Novell Inc. 6 * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org> 7 * Copyright (c) 2012-2019 Linux Foundation 8 * 9 * Core driver model functions and structures that should not be 10 * shared outside of the drivers/base/ directory. 11 * 12 */ 13 #include <linux/notifier.h> 14 15 /** 16 * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure. 17 * 18 * @subsys - the struct kset that defines this subsystem 19 * @devices_kset - the subsystem's 'devices' directory 20 * @interfaces - list of subsystem interfaces associated 21 * @mutex - protect the devices, and interfaces lists. 22 * 23 * @drivers_kset - the list of drivers associated 24 * @klist_devices - the klist to iterate over the @devices_kset 25 * @klist_drivers - the klist to iterate over the @drivers_kset 26 * @bus_notifier - the bus notifier list for anything that cares about things 27 * on this bus. 28 * @bus - pointer back to the struct bus_type that this structure is associated 29 * with. 30 * 31 * @glue_dirs - "glue" directory to put in-between the parent device to 32 * avoid namespace conflicts 33 * @class - pointer back to the struct class that this structure is associated 34 * with. 35 * 36 * This structure is the one that is the actual kobject allowing struct 37 * bus_type/class to be statically allocated safely. Nothing outside of the 38 * driver core should ever touch these fields. 39 */ 40 struct subsys_private { 41 struct kset subsys; 42 struct kset *devices_kset; 43 struct list_head interfaces; 44 struct mutex mutex; 45 46 struct kset *drivers_kset; 47 struct klist klist_devices; 48 struct klist klist_drivers; 49 struct blocking_notifier_head bus_notifier; 50 unsigned int drivers_autoprobe:1; 51 struct bus_type *bus; 52 53 struct kset glue_dirs; 54 struct class *class; 55 }; 56 #define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj) 57 58 struct driver_private { 59 struct kobject kobj; 60 struct klist klist_devices; 61 struct klist_node knode_bus; 62 struct module_kobject *mkobj; 63 struct device_driver *driver; 64 }; 65 #define to_driver(obj) container_of(obj, struct driver_private, kobj) 66 67 /** 68 * struct device_private - structure to hold the private to the driver core portions of the device structure. 69 * 70 * @klist_children - klist containing all children of this device 71 * @knode_parent - node in sibling list 72 * @knode_driver - node in driver list 73 * @knode_bus - node in bus list 74 * @knode_class - node in class list 75 * @deferred_probe - entry in deferred_probe_list which is used to retry the 76 * binding of drivers which were unable to get all the resources needed by 77 * the device; typically because it depends on another driver getting 78 * probed first. 79 * @async_driver - pointer to device driver awaiting probe via async_probe 80 * @device - pointer back to the struct device that this structure is 81 * associated with. 82 * @dead - This device is currently either in the process of or has been 83 * removed from the system. Any asynchronous events scheduled for this 84 * device should exit without taking any action. 85 * 86 * Nothing outside of the driver core should ever touch these fields. 87 */ 88 struct device_private { 89 struct klist klist_children; 90 struct klist_node knode_parent; 91 struct klist_node knode_driver; 92 struct klist_node knode_bus; 93 struct klist_node knode_class; 94 struct list_head deferred_probe; 95 struct device_driver *async_driver; 96 char *deferred_probe_reason; 97 struct device *device; 98 u8 dead:1; 99 }; 100 #define to_device_private_parent(obj) \ 101 container_of(obj, struct device_private, knode_parent) 102 #define to_device_private_driver(obj) \ 103 container_of(obj, struct device_private, knode_driver) 104 #define to_device_private_bus(obj) \ 105 container_of(obj, struct device_private, knode_bus) 106 #define to_device_private_class(obj) \ 107 container_of(obj, struct device_private, knode_class) 108 109 /* initialisation functions */ 110 extern int devices_init(void); 111 extern int buses_init(void); 112 extern int classes_init(void); 113 extern int firmware_init(void); 114 #ifdef CONFIG_SYS_HYPERVISOR 115 extern int hypervisor_init(void); 116 #else 117 static inline int hypervisor_init(void) { return 0; } 118 #endif 119 extern int platform_bus_init(void); 120 extern void cpu_dev_init(void); 121 extern void container_dev_init(void); 122 123 struct kobject *virtual_device_parent(struct device *dev); 124 125 extern int bus_add_device(struct device *dev); 126 extern void bus_probe_device(struct device *dev); 127 extern void bus_remove_device(struct device *dev); 128 129 extern int bus_add_driver(struct device_driver *drv); 130 extern void bus_remove_driver(struct device_driver *drv); 131 extern void device_release_driver_internal(struct device *dev, 132 struct device_driver *drv, 133 struct device *parent); 134 135 extern void driver_detach(struct device_driver *drv); 136 extern int driver_probe_device(struct device_driver *drv, struct device *dev); 137 extern void driver_deferred_probe_del(struct device *dev); 138 extern void device_set_deferred_probe_reason(const struct device *dev, 139 struct va_format *vaf); 140 static inline int driver_match_device(struct device_driver *drv, 141 struct device *dev) 142 { 143 return drv->bus->match ? drv->bus->match(dev, drv) : 1; 144 } 145 extern bool driver_allows_async_probing(struct device_driver *drv); 146 147 extern int driver_add_groups(struct device_driver *drv, 148 const struct attribute_group **groups); 149 extern void driver_remove_groups(struct device_driver *drv, 150 const struct attribute_group **groups); 151 int device_driver_attach(struct device_driver *drv, struct device *dev); 152 void device_driver_detach(struct device *dev); 153 154 extern char *make_class_name(const char *name, struct kobject *kobj); 155 156 extern int devres_release_all(struct device *dev); 157 extern void device_block_probing(void); 158 extern void device_unblock_probing(void); 159 160 /* /sys/devices directory */ 161 extern struct kset *devices_kset; 162 extern void devices_kset_move_last(struct device *dev); 163 164 #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS) 165 extern void module_add_driver(struct module *mod, struct device_driver *drv); 166 extern void module_remove_driver(struct device_driver *drv); 167 #else 168 static inline void module_add_driver(struct module *mod, 169 struct device_driver *drv) { } 170 static inline void module_remove_driver(struct device_driver *drv) { } 171 #endif 172 173 #ifdef CONFIG_DEVTMPFS 174 extern int devtmpfs_init(void); 175 #else 176 static inline int devtmpfs_init(void) { return 0; } 177 #endif 178 179 /* Device links support */ 180 extern int device_links_read_lock(void); 181 extern void device_links_read_unlock(int idx); 182 extern int device_links_read_lock_held(void); 183 extern int device_links_check_suppliers(struct device *dev); 184 extern void device_links_driver_bound(struct device *dev); 185 extern void device_links_driver_cleanup(struct device *dev); 186 extern void device_links_no_driver(struct device *dev); 187 extern bool device_links_busy(struct device *dev); 188 extern void device_links_unbind_consumers(struct device *dev); 189 190 /* device pm support */ 191 void device_pm_move_to_tail(struct device *dev); 192 193 #ifdef CONFIG_DEVTMPFS 194 int devtmpfs_create_node(struct device *dev); 195 int devtmpfs_delete_node(struct device *dev); 196 #else 197 static inline int devtmpfs_create_node(struct device *dev) { return 0; } 198 static inline int devtmpfs_delete_node(struct device *dev) { return 0; } 199 #endif 200