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 * @deferred_probe - entry in deferred_probe_list which is used to retry the 64 * binding of drivers which were unable to get all the resources needed by 65 * the device; typically because it depends on another driver getting 66 * probed first. 67 * @device - pointer back to the struct device that this structure is 68 * associated with. 69 * 70 * Nothing outside of the driver core should ever touch these fields. 71 */ 72 struct device_private { 73 struct klist klist_children; 74 struct klist_node knode_parent; 75 struct klist_node knode_driver; 76 struct klist_node knode_bus; 77 struct list_head deferred_probe; 78 struct device *device; 79 }; 80 #define to_device_private_parent(obj) \ 81 container_of(obj, struct device_private, knode_parent) 82 #define to_device_private_driver(obj) \ 83 container_of(obj, struct device_private, knode_driver) 84 #define to_device_private_bus(obj) \ 85 container_of(obj, struct device_private, knode_bus) 86 87 extern int device_private_init(struct device *dev); 88 89 /* initialisation functions */ 90 extern int devices_init(void); 91 extern int buses_init(void); 92 extern int classes_init(void); 93 extern int firmware_init(void); 94 #ifdef CONFIG_SYS_HYPERVISOR 95 extern int hypervisor_init(void); 96 #else 97 static inline int hypervisor_init(void) { return 0; } 98 #endif 99 extern int platform_bus_init(void); 100 extern void cpu_dev_init(void); 101 extern void container_dev_init(void); 102 103 struct kobject *virtual_device_parent(struct device *dev); 104 105 extern int bus_add_device(struct device *dev); 106 extern void bus_probe_device(struct device *dev); 107 extern void bus_remove_device(struct device *dev); 108 109 extern int bus_add_driver(struct device_driver *drv); 110 extern void bus_remove_driver(struct device_driver *drv); 111 extern void device_release_driver_internal(struct device *dev, 112 struct device_driver *drv, 113 struct device *parent); 114 115 extern void driver_detach(struct device_driver *drv); 116 extern int driver_probe_device(struct device_driver *drv, struct device *dev); 117 extern void driver_deferred_probe_del(struct device *dev); 118 static inline int driver_match_device(struct device_driver *drv, 119 struct device *dev) 120 { 121 return drv->bus->match ? drv->bus->match(dev, drv) : 1; 122 } 123 extern bool driver_allows_async_probing(struct device_driver *drv); 124 125 extern int driver_add_groups(struct device_driver *drv, 126 const struct attribute_group **groups); 127 extern void driver_remove_groups(struct device_driver *drv, 128 const struct attribute_group **groups); 129 130 extern char *make_class_name(const char *name, struct kobject *kobj); 131 132 extern int devres_release_all(struct device *dev); 133 extern void device_block_probing(void); 134 extern void device_unblock_probing(void); 135 136 /* /sys/devices directory */ 137 extern struct kset *devices_kset; 138 extern void devices_kset_move_last(struct device *dev); 139 140 #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS) 141 extern void module_add_driver(struct module *mod, struct device_driver *drv); 142 extern void module_remove_driver(struct device_driver *drv); 143 #else 144 static inline void module_add_driver(struct module *mod, 145 struct device_driver *drv) { } 146 static inline void module_remove_driver(struct device_driver *drv) { } 147 #endif 148 149 #ifdef CONFIG_DEVTMPFS 150 extern int devtmpfs_init(void); 151 #else 152 static inline int devtmpfs_init(void) { return 0; } 153 #endif 154 155 /* Device links support */ 156 extern int device_links_read_lock(void); 157 extern void device_links_read_unlock(int idx); 158 extern int device_links_check_suppliers(struct device *dev); 159 extern void device_links_driver_bound(struct device *dev); 160 extern void device_links_driver_cleanup(struct device *dev); 161 extern void device_links_no_driver(struct device *dev); 162 extern bool device_links_busy(struct device *dev); 163 extern void device_links_unbind_consumers(struct device *dev); 164 165 /* device pm support */ 166 void device_pm_move_to_tail(struct device *dev); 167