LXR linux/drivers/base/base.h

   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 */
  40struct 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
  58struct 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 */
  88struct 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 */
 110extern int devices_init(void);
 111extern int buses_init(void);
 112extern int classes_init(void);
 113extern int firmware_init(void);
 114#ifdef CONFIG_SYS_HYPERVISOR
 115extern int hypervisor_init(void);
 116#else
 117static inline int hypervisor_init(void) { return 0; }
 118#endif
 119extern int platform_bus_init(void);
 120extern void cpu_dev_init(void);
 121extern void container_dev_init(void);
 122
 123struct kobject *virtual_device_parent(struct device *dev);
 124
 125extern int bus_add_device(struct device *dev);
 126extern void bus_probe_device(struct device *dev);
 127extern void bus_remove_device(struct device *dev);
 128
 129extern int bus_add_driver(struct device_driver *drv);
 130extern void bus_remove_driver(struct device_driver *drv);
 131extern void device_release_driver_internal(struct device *dev,
 132                                           struct device_driver *drv,
 133                                           struct device *parent);
 134
 135extern void driver_detach(struct device_driver *drv);
 136extern int driver_probe_device(struct device_driver *drv, struct device *dev);
 137extern void driver_deferred_probe_del(struct device *dev);
 138extern void device_set_deferred_probe_reason(const struct device *dev,
 139                                             struct va_format *vaf);
 140static 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}
 145extern bool driver_allows_async_probing(struct device_driver *drv);
 146
 147extern int driver_add_groups(struct device_driver *drv,
 148                             const struct attribute_group **groups);
 149extern void driver_remove_groups(struct device_driver *drv,
 150                                 const struct attribute_group **groups);
 151int device_driver_attach(struct device_driver *drv, struct device *dev);
 152void device_driver_detach(struct device *dev);
 153
 154extern char *make_class_name(const char *name, struct kobject *kobj);
 155
 156extern int devres_release_all(struct device *dev);
 157extern void device_block_probing(void);
 158extern void device_unblock_probing(void);
 159
 160/* /sys/devices directory */
 161extern struct kset *devices_kset;
 162extern void devices_kset_move_last(struct device *dev);
 163
 164#if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
 165extern void module_add_driver(struct module *mod, struct device_driver *drv);
 166extern void module_remove_driver(struct device_driver *drv);
 167#else
 168static inline void module_add_driver(struct module *mod,
 169                                     struct device_driver *drv) { }
 170static inline void module_remove_driver(struct device_driver *drv) { }
 171#endif
 172
 173#ifdef CONFIG_DEVTMPFS
 174extern int devtmpfs_init(void);
 175#else
 176static inline int devtmpfs_init(void) { return 0; }
 177#endif
 178
 179/* Device links support */
 180extern int device_links_read_lock(void);
 181extern void device_links_read_unlock(int idx);
 182extern int device_links_read_lock_held(void);
 183extern int device_links_check_suppliers(struct device *dev);
 184extern void device_links_driver_bound(struct device *dev);
 185extern void device_links_driver_cleanup(struct device *dev);
 186extern void device_links_no_driver(struct device *dev);
 187extern bool device_links_busy(struct device *dev);
 188extern void device_links_unbind_consumers(struct device *dev);
 189
 190/* device pm support */
 191void device_pm_move_to_tail(struct device *dev);
 192
 193#ifdef CONFIG_DEVTMPFS
 194int devtmpfs_create_node(struct device *dev);
 195int devtmpfs_delete_node(struct device *dev);
 196#else
 197static inline int devtmpfs_create_node(struct device *dev) { return 0; }
 198static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
 199#endif
 200