1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 25367601bSGreg Kroah-Hartman /* 35367601bSGreg Kroah-Hartman * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> 45367601bSGreg Kroah-Hartman * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> 55367601bSGreg Kroah-Hartman * Copyright (c) 2008-2012 Novell Inc. 65367601bSGreg Kroah-Hartman * Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org> 75367601bSGreg Kroah-Hartman * Copyright (c) 2012-2019 Linux Foundation 85367601bSGreg Kroah-Hartman * 95367601bSGreg Kroah-Hartman * Core driver model functions and structures that should not be 105367601bSGreg Kroah-Hartman * shared outside of the drivers/base/ directory. 115367601bSGreg Kroah-Hartman * 125367601bSGreg Kroah-Hartman */ 13ba33162aSPaul Gortmaker #include <linux/notifier.h> 14a1bdc7aaSBen Dooks 15c6f7e72aSGreg Kroah-Hartman /** 166b6e39a6SKay Sievers * struct subsys_private - structure to hold the private to the driver core portions of the bus_type/class structure. 17c6f7e72aSGreg Kroah-Hartman * 186b6e39a6SKay Sievers * @subsys - the struct kset that defines this subsystem 19ca22e56dSKay Sievers * @devices_kset - the subsystem's 'devices' directory 20ca22e56dSKay Sievers * @interfaces - list of subsystem interfaces associated 21ca22e56dSKay Sievers * @mutex - protect the devices, and interfaces lists. 226b6e39a6SKay Sievers * 236b6e39a6SKay Sievers * @drivers_kset - the list of drivers associated 24c6f7e72aSGreg Kroah-Hartman * @klist_devices - the klist to iterate over the @devices_kset 25c6f7e72aSGreg Kroah-Hartman * @klist_drivers - the klist to iterate over the @drivers_kset 26c6f7e72aSGreg Kroah-Hartman * @bus_notifier - the bus notifier list for anything that cares about things 27c6f7e72aSGreg Kroah-Hartman * on this bus. 28c6f7e72aSGreg Kroah-Hartman * @bus - pointer back to the struct bus_type that this structure is associated 29c6f7e72aSGreg Kroah-Hartman * with. 309cc61e5fSGreg Kroah-Hartman * @dev_root: Default device to use as the parent. 31c6f7e72aSGreg Kroah-Hartman * 326b6e39a6SKay Sievers * @glue_dirs - "glue" directory to put in-between the parent device to 336b6e39a6SKay Sievers * avoid namespace conflicts 346b6e39a6SKay Sievers * @class - pointer back to the struct class that this structure is associated 356b6e39a6SKay Sievers * with. 366b6e39a6SKay Sievers * 37c6f7e72aSGreg Kroah-Hartman * This structure is the one that is the actual kobject allowing struct 386b6e39a6SKay Sievers * bus_type/class to be statically allocated safely. Nothing outside of the 396b6e39a6SKay Sievers * driver core should ever touch these fields. 40c6f7e72aSGreg Kroah-Hartman */ 416b6e39a6SKay Sievers struct subsys_private { 42c6f7e72aSGreg Kroah-Hartman struct kset subsys; 43c6f7e72aSGreg Kroah-Hartman struct kset *devices_kset; 44ca22e56dSKay Sievers struct list_head interfaces; 45ca22e56dSKay Sievers struct mutex mutex; 466b6e39a6SKay Sievers 476b6e39a6SKay Sievers struct kset *drivers_kset; 48c6f7e72aSGreg Kroah-Hartman struct klist klist_devices; 49c6f7e72aSGreg Kroah-Hartman struct klist klist_drivers; 50c6f7e72aSGreg Kroah-Hartman struct blocking_notifier_head bus_notifier; 51c6f7e72aSGreg Kroah-Hartman unsigned int drivers_autoprobe:1; 52*00c4a3c4SGreg Kroah-Hartman const struct bus_type *bus; 539cc61e5fSGreg Kroah-Hartman struct device *dev_root; 546b6e39a6SKay Sievers 556b6e39a6SKay Sievers struct kset glue_dirs; 566b6e39a6SKay Sievers struct class *class; 5737e98d9bSGreg Kroah-Hartman 5837e98d9bSGreg Kroah-Hartman struct lock_class_key lock_key; 59c6f7e72aSGreg Kroah-Hartman }; 607bbb89b4SGreg Kroah-Hartman #define to_subsys_private(obj) container_of_const(obj, struct subsys_private, subsys.kobj) 61a1bdc7aaSBen Dooks 62789be03aSGreg Kroah-Hartman static inline struct subsys_private *subsys_get(struct subsys_private *sp) 63789be03aSGreg Kroah-Hartman { 64789be03aSGreg Kroah-Hartman if (sp) 65789be03aSGreg Kroah-Hartman kset_get(&sp->subsys); 66789be03aSGreg Kroah-Hartman return sp; 67789be03aSGreg Kroah-Hartman } 68789be03aSGreg Kroah-Hartman 69789be03aSGreg Kroah-Hartman static inline void subsys_put(struct subsys_private *sp) 70789be03aSGreg Kroah-Hartman { 71789be03aSGreg Kroah-Hartman if (sp) 72789be03aSGreg Kroah-Hartman kset_put(&sp->subsys); 73789be03aSGreg Kroah-Hartman } 74789be03aSGreg Kroah-Hartman 75e5dd1278SGreg Kroah-Hartman struct driver_private { 76e5dd1278SGreg Kroah-Hartman struct kobject kobj; 77e5dd1278SGreg Kroah-Hartman struct klist klist_devices; 78e5dd1278SGreg Kroah-Hartman struct klist_node knode_bus; 79e5dd1278SGreg Kroah-Hartman struct module_kobject *mkobj; 80e5dd1278SGreg Kroah-Hartman struct device_driver *driver; 81e5dd1278SGreg Kroah-Hartman }; 82e5dd1278SGreg Kroah-Hartman #define to_driver(obj) container_of(obj, struct driver_private, kobj) 83c6f7e72aSGreg Kroah-Hartman 84fb069a5dSGreg Kroah-Hartman /** 85fb069a5dSGreg Kroah-Hartman * struct device_private - structure to hold the private to the driver core portions of the device structure. 86fb069a5dSGreg Kroah-Hartman * 87f791b8c8SGreg Kroah-Hartman * @klist_children - klist containing all children of this device 88f791b8c8SGreg Kroah-Hartman * @knode_parent - node in sibling list 898940b4f3SGreg Kroah-Hartman * @knode_driver - node in driver list 90ae1b4171SGreg Kroah-Hartman * @knode_bus - node in bus list 91570d0200SWei Yang * @knode_class - node in class list 92ef8a3fd6SGreg Kroah-Hartman * @deferred_probe - entry in deferred_probe_list which is used to retry the 93ef8a3fd6SGreg Kroah-Hartman * binding of drivers which were unable to get all the resources needed by 94ef8a3fd6SGreg Kroah-Hartman * the device; typically because it depends on another driver getting 95ef8a3fd6SGreg Kroah-Hartman * probed first. 96ef0ff683SAlexander Duyck * @async_driver - pointer to device driver awaiting probe via async_probe 9782b2c3c5STomeu Vizoso * @device - pointer back to the struct device that this structure is 98fb069a5dSGreg Kroah-Hartman * associated with. 993451a495SAlexander Duyck * @dead - This device is currently either in the process of or has been 1003451a495SAlexander Duyck * removed from the system. Any asynchronous events scheduled for this 1013451a495SAlexander Duyck * device should exit without taking any action. 102fb069a5dSGreg Kroah-Hartman * 103fb069a5dSGreg Kroah-Hartman * Nothing outside of the driver core should ever touch these fields. 104fb069a5dSGreg Kroah-Hartman */ 105fb069a5dSGreg Kroah-Hartman struct device_private { 106f791b8c8SGreg Kroah-Hartman struct klist klist_children; 107f791b8c8SGreg Kroah-Hartman struct klist_node knode_parent; 1088940b4f3SGreg Kroah-Hartman struct klist_node knode_driver; 109ae1b4171SGreg Kroah-Hartman struct klist_node knode_bus; 110570d0200SWei Yang struct klist_node knode_class; 111ef8a3fd6SGreg Kroah-Hartman struct list_head deferred_probe; 112ef0ff683SAlexander Duyck struct device_driver *async_driver; 113d090b70eSAndrzej Hajda char *deferred_probe_reason; 114fb069a5dSGreg Kroah-Hartman struct device *device; 1153451a495SAlexander Duyck u8 dead:1; 116fb069a5dSGreg Kroah-Hartman }; 117f791b8c8SGreg Kroah-Hartman #define to_device_private_parent(obj) \ 118f791b8c8SGreg Kroah-Hartman container_of(obj, struct device_private, knode_parent) 1198940b4f3SGreg Kroah-Hartman #define to_device_private_driver(obj) \ 1208940b4f3SGreg Kroah-Hartman container_of(obj, struct device_private, knode_driver) 121ae1b4171SGreg Kroah-Hartman #define to_device_private_bus(obj) \ 122ae1b4171SGreg Kroah-Hartman container_of(obj, struct device_private, knode_bus) 123570d0200SWei Yang #define to_device_private_class(obj) \ 124570d0200SWei Yang container_of(obj, struct device_private, knode_class) 125fb069a5dSGreg Kroah-Hartman 126c6f7e72aSGreg Kroah-Hartman /* initialisation functions */ 127a1bdc7aaSBen Dooks extern int devices_init(void); 128a1bdc7aaSBen Dooks extern int buses_init(void); 129a1bdc7aaSBen Dooks extern int classes_init(void); 130a1bdc7aaSBen Dooks extern int firmware_init(void); 1314039483fSMichael Holzheu #ifdef CONFIG_SYS_HYPERVISOR 1324039483fSMichael Holzheu extern int hypervisor_init(void); 1334039483fSMichael Holzheu #else 1344039483fSMichael Holzheu static inline int hypervisor_init(void) { return 0; } 1354039483fSMichael Holzheu #endif 136a1bdc7aaSBen Dooks extern int platform_bus_init(void); 137024f7846SBen Hutchings extern void cpu_dev_init(void); 138caa73ea1SRafael J. Wysocki extern void container_dev_init(void); 139471b12c4SDave Jiang #ifdef CONFIG_AUXILIARY_BUS 140471b12c4SDave Jiang extern void auxiliary_bus_init(void); 141471b12c4SDave Jiang #else 142471b12c4SDave Jiang static inline void auxiliary_bus_init(void) { } 143471b12c4SDave Jiang #endif 144a1bdc7aaSBen Dooks 145d73ce004STejun Heo struct kobject *virtual_device_parent(struct device *dev); 146d73ce004STejun Heo 1471da177e4SLinus Torvalds extern int bus_add_device(struct device *dev); 1482023c610SAlan Stern extern void bus_probe_device(struct device *dev); 1491da177e4SLinus Torvalds extern void bus_remove_device(struct device *dev); 150ed9f9181SGreg Kroah-Hartman void bus_notify(struct device *dev, enum bus_notifier_event value); 15163b823d7SGreg Kroah-Hartman bool bus_is_registered(const struct bus_type *bus); 1521da177e4SLinus Torvalds 1534a3ad20cSGreg Kroah-Hartman extern int bus_add_driver(struct device_driver *drv); 1544a3ad20cSGreg Kroah-Hartman extern void bus_remove_driver(struct device_driver *drv); 1559ed98953SRafael J. Wysocki extern void device_release_driver_internal(struct device *dev, 1569ed98953SRafael J. Wysocki struct device_driver *drv, 1579ed98953SRafael J. Wysocki struct device *parent); 1581da177e4SLinus Torvalds 15907e4a3e2Smochel@digitalimplant.org extern void driver_detach(struct device_driver *drv); 160d1c3414cSGrant Likely extern void driver_deferred_probe_del(struct device *dev); 161d090b70eSAndrzej Hajda extern void device_set_deferred_probe_reason(const struct device *dev, 162d090b70eSAndrzej Hajda struct va_format *vaf); 16349b420a1SMing Lei static inline int driver_match_device(struct device_driver *drv, 16449b420a1SMing Lei struct device *dev) 16549b420a1SMing Lei { 1665247aecfSMing Lei return drv->bus->match ? drv->bus->match(dev, drv) : 1; 16749b420a1SMing Lei } 16807e4a3e2Smochel@digitalimplant.org 169f8fb5766SSaravana Kannan static inline void dev_sync_state(struct device *dev) 170f8fb5766SSaravana Kannan { 171f8fb5766SSaravana Kannan if (dev->bus->sync_state) 172f8fb5766SSaravana Kannan dev->bus->sync_state(dev); 173f8fb5766SSaravana Kannan else if (dev->driver && dev->driver->sync_state) 174f8fb5766SSaravana Kannan dev->driver->sync_state(dev); 175f8fb5766SSaravana Kannan } 176f8fb5766SSaravana Kannan 177ed0617b5SGreg Kroah-Hartman extern int driver_add_groups(struct device_driver *drv, 178ed0617b5SGreg Kroah-Hartman const struct attribute_group **groups); 179ed0617b5SGreg Kroah-Hartman extern void driver_remove_groups(struct device_driver *drv, 180ed0617b5SGreg Kroah-Hartman const struct attribute_group **groups); 181ed88747cSAlexander Duyck void device_driver_detach(struct device *dev); 182ed0617b5SGreg Kroah-Hartman 1832a013455SAdrian Bunk extern int devres_release_all(struct device *dev); 184013c074fSStrashko, Grygorii extern void device_block_probing(void); 185013c074fSStrashko, Grygorii extern void device_unblock_probing(void); 1862b28a1a8SSaravana Kannan extern void deferred_probe_extend_timeout(void); 1872f8c3ae8SSaravana Kannan extern void driver_deferred_probe_trigger(void); 18842bb5be8SGreg Kroah-Hartman const char *device_get_devnode(const struct device *dev, umode_t *mode, 18942bb5be8SGreg Kroah-Hartman kuid_t *uid, kgid_t *gid, const char **tmp); 190823bccfcSGreg Kroah-Hartman 191ca22e56dSKay Sievers /* /sys/devices directory */ 192881c6cfdSGreg Kroah-Hartman extern struct kset *devices_kset; 19352cdbdd4SGrygorii Strashko extern void devices_kset_move_last(struct device *dev); 194c63469a3SGreg Kroah-Hartman 19592b42141SRandy Dunlap #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS) 196c63469a3SGreg Kroah-Hartman extern void module_add_driver(struct module *mod, struct device_driver *drv); 197c63469a3SGreg Kroah-Hartman extern void module_remove_driver(struct device_driver *drv); 198c63469a3SGreg Kroah-Hartman #else 199c63469a3SGreg Kroah-Hartman static inline void module_add_driver(struct module *mod, 200c63469a3SGreg Kroah-Hartman struct device_driver *drv) { } 201c63469a3SGreg Kroah-Hartman static inline void module_remove_driver(struct device_driver *drv) { } 202c63469a3SGreg Kroah-Hartman #endif 2032b2af54aSKay Sievers 2042b2af54aSKay Sievers #ifdef CONFIG_DEVTMPFS 2052b2af54aSKay Sievers extern int devtmpfs_init(void); 2062b2af54aSKay Sievers #else 2072b2af54aSKay Sievers static inline int devtmpfs_init(void) { return 0; } 2082b2af54aSKay Sievers #endif 2099ed98953SRafael J. Wysocki 2109ed98953SRafael J. Wysocki /* Device links support */ 2119ed98953SRafael J. Wysocki extern int device_links_read_lock(void); 2129ed98953SRafael J. Wysocki extern void device_links_read_unlock(int idx); 213c2fa1e1bSJoel Fernandes (Google) extern int device_links_read_lock_held(void); 2149ed98953SRafael J. Wysocki extern int device_links_check_suppliers(struct device *dev); 215b6f617dfSSaravana Kannan extern void device_links_force_bind(struct device *dev); 2169ed98953SRafael J. Wysocki extern void device_links_driver_bound(struct device *dev); 2179ed98953SRafael J. Wysocki extern void device_links_driver_cleanup(struct device *dev); 2189ed98953SRafael J. Wysocki extern void device_links_no_driver(struct device *dev); 2199ed98953SRafael J. Wysocki extern bool device_links_busy(struct device *dev); 2209ed98953SRafael J. Wysocki extern void device_links_unbind_consumers(struct device *dev); 221d46f3e3eSSaravana Kannan extern void fw_devlink_drivers_done(void); 222ffbe08a8SSaravana Kannan extern void fw_devlink_probing_done(void); 223494fd7b7SFeng Kan 224494fd7b7SFeng Kan /* device pm support */ 225494fd7b7SFeng Kan void device_pm_move_to_tail(struct device *dev); 226cf901a1cSGreg Kroah-Hartman 227cf901a1cSGreg Kroah-Hartman #ifdef CONFIG_DEVTMPFS 228cf901a1cSGreg Kroah-Hartman int devtmpfs_create_node(struct device *dev); 229d3583f06SGreg Kroah-Hartman int devtmpfs_delete_node(struct device *dev); 230cf901a1cSGreg Kroah-Hartman #else 231cf901a1cSGreg Kroah-Hartman static inline int devtmpfs_create_node(struct device *dev) { return 0; } 232d3583f06SGreg Kroah-Hartman static inline int devtmpfs_delete_node(struct device *dev) { return 0; } 233cf901a1cSGreg Kroah-Hartman #endif 234384f5a85SRafael J. Wysocki 235384f5a85SRafael J. Wysocki void software_node_notify(struct device *dev); 236384f5a85SRafael J. Wysocki void software_node_notify_remove(struct device *dev); 237