1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #include <linux/notifier.h> 3 4 /** 5 * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure. 6 * 7 * @subsys - the struct kset that defines this subsystem 8 * @devices_kset - the subsystem's 'devices' directory 9 * @interfaces - list of subsystem interfaces associated 10 * @mutex - protect the devices, and interfaces lists. 11 * 12 * @drivers_kset - the list of drivers associated 13 * @klist_devices - the klist to iterate over the @devices_kset 14 * @klist_drivers - the klist to iterate over the @drivers_kset 15 * @bus_notifier - the bus notifier list for anything that cares about things 16 * on this bus. 17 * @bus - pointer back to the struct bus_type that this structure is associated 18 * with. 19 * 20 * @glue_dirs - "glue" directory to put in-between the parent device to 21 * avoid namespace conflicts 22 * @class - pointer back to the struct class that this structure is associated 23 * with. 24 * 25 * This structure is the one that is the actual kobject allowing struct 26 * bus_type/class to be statically allocated safely. Nothing outside of the 27 * driver core should ever touch these fields. 28 */ 29 struct subsys_private { 30 struct kset subsys; 31 struct kset *devices_kset; 32 struct list_head interfaces; 33 struct mutex mutex; 34 35 struct kset *drivers_kset; 36 struct klist klist_devices; 37 struct klist klist_drivers; 38 struct blocking_notifier_head bus_notifier; 39 unsigned int drivers_autoprobe:1; 40 struct bus_type *bus; 41 42 struct kset glue_dirs; 43 struct class *class; 44 }; 45 #define to_subsys_private(obj) container_of(obj, struct subsys_private, subsys.kobj) 46 47 struct driver_private { 48 struct kobject kobj; 49 struct klist klist_devices; 50 struct klist_node knode_bus; 51 struct module_kobject *mkobj; 52 struct device_driver *driver; 53 }; 54 #define to_driver(obj) container_of(obj, struct driver_private, kobj) 55 56 /** 57 * struct device_private - structure to hold the private to the driver core portions of the device structure. 58 * 59 * @klist_children - klist containing all children of this device 60 * @knode_parent - node in sibling list 61 * @knode_driver - node in driver list 62 * @knode_bus - node in bus list 63 * @knode_class - node in class list 64 * @deferred_probe - entry in deferred_probe_list which is used to retry the 65 * binding of drivers which were unable to get all the resources needed by 66 * the device; typically because it depends on another driver getting 67 * probed first. 68 * @async_driver - pointer to device driver awaiting probe via async_probe 69 * @device - pointer back to the struct device that this structure is 70 * associated with. 71 * @dead - This device is currently either in the process of or has been 72 * removed from the system. Any asynchronous events scheduled for this 73 * device should exit without taking any action. 74 * 75 * Nothing outside of the driver core should ever touch these fields. 76 */ 77 struct device_private { 78 struct klist klist_children; 79 struct klist_node knode_parent; 80 struct klist_node knode_driver; 81 struct klist_node knode_bus; 82 struct klist_node knode_class; 83 struct list_head deferred_probe; 84 struct device_driver *async_driver; 85 struct device *device; 86 u8 dead:1; 87 }; 88 #define to_device_private_parent(obj) \ 89 container_of(obj, struct device_private, knode_parent) 90 #define to_device_private_driver(obj) \ 91 container_of(obj, struct device_private, knode_driver) 92 #define to_device_private_bus(obj) \ 93 container_of(obj, struct device_private, knode_bus) 94 #define to_device_private_class(obj) \ 95 container_of(obj, struct device_private, knode_class) 96 97 /* initialisation functions */ 98 extern int devices_init(void); 99 extern int buses_init(void); 100 extern int classes_init(void); 101 extern int firmware_init(void); 102 #ifdef CONFIG_SYS_HYPERVISOR 103 extern int hypervisor_init(void); 104 #else 105 static inline int hypervisor_init(void) { return 0; } 106 #endif 107 extern int platform_bus_init(void); 108 extern void cpu_dev_init(void); 109 extern void container_dev_init(void); 110 111 struct kobject *virtual_device_parent(struct device *dev); 112 113 extern int bus_add_device(struct device *dev); 114 extern void bus_probe_device(struct device *dev); 115 extern void bus_remove_device(struct device *dev); 116 117 extern int bus_add_driver(struct device_driver *drv); 118 extern void bus_remove_driver(struct device_driver *drv); 119 extern void device_release_driver_internal(struct device *dev, 120 struct device_driver *drv, 121 struct device *parent); 122 123 extern void driver_detach(struct device_driver *drv); 124 extern int driver_probe_device(struct device_driver *drv, struct device *dev); 125 extern void driver_deferred_probe_del(struct device *dev); 126 static inline int driver_match_device(struct device_driver *drv, 127 struct device *dev) 128 { 129 return drv->bus->match ? drv->bus->match(dev, drv) : 1; 130 } 131 extern bool driver_allows_async_probing(struct device_driver *drv); 132 133 extern int driver_add_groups(struct device_driver *drv, 134 const struct attribute_group **groups); 135 extern void driver_remove_groups(struct device_driver *drv, 136 const struct attribute_group **groups); 137 int device_driver_attach(struct device_driver *drv, struct device *dev); 138 void device_driver_detach(struct device *dev); 139 140 extern char *make_class_name(const char *name, struct kobject *kobj); 141 142 extern int devres_release_all(struct device *dev); 143 extern void device_block_probing(void); 144 extern void device_unblock_probing(void); 145 146 /* /sys/devices directory */ 147 extern struct kset *devices_kset; 148 extern void devices_kset_move_last(struct device *dev); 149 150 #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS) 151 extern void module_add_driver(struct module *mod, struct device_driver *drv); 152 extern void module_remove_driver(struct device_driver *drv); 153 #else 154 static inline void module_add_driver(struct module *mod, 155 struct device_driver *drv) { } 156 static inline void module_remove_driver(struct device_driver *drv) { } 157 #endif 158 159 #ifdef CONFIG_DEVTMPFS 160 extern int devtmpfs_init(void); 161 #else 162 static inline int devtmpfs_init(void) { return 0; } 163 #endif 164 165 /* Device links support */ 166 extern int device_links_read_lock(void); 167 extern void device_links_read_unlock(int idx); 168 extern int device_links_check_suppliers(struct device *dev); 169 extern void device_links_driver_bound(struct device *dev); 170 extern void device_links_driver_cleanup(struct device *dev); 171 extern void device_links_no_driver(struct device *dev); 172 extern bool device_links_busy(struct device *dev); 173 extern void device_links_unbind_consumers(struct device *dev); 174 175 /* device pm support */ 176 void device_pm_move_to_tail(struct device *dev); 177