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  */
  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 void driver_deferred_probe_del(struct device *dev);
 137 extern void device_set_deferred_probe_reason(const struct device *dev,
 138                                              struct va_format *vaf);
 139 static inline int driver_match_device(struct device_driver *drv,
 140                                       struct device *dev)
 141 {
 142         return drv->bus->match ? drv->bus->match(dev, drv) : 1;
 143 }
 144 extern bool driver_allows_async_probing(struct device_driver *drv);
 145
 146 extern int driver_add_groups(struct device_driver *drv,
 147                              const struct attribute_group **groups);
 148 extern void driver_remove_groups(struct device_driver *drv,
 149                                  const struct attribute_group **groups);
 150 int device_driver_attach(struct device_driver *drv, struct device *dev);
 151 void device_driver_detach(struct device *dev);
 152
 153 extern char *make_class_name(const char *name, struct kobject *kobj);
 154
 155 extern int devres_release_all(struct device *dev);
 156 extern void device_block_probing(void);
 157 extern void device_unblock_probing(void);
 158
 159 /* /sys/devices directory */
 160 extern struct kset *devices_kset;
 161 extern void devices_kset_move_last(struct device *dev);
 162
 163 #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
 164 extern void module_add_driver(struct module *mod, struct device_driver *drv);
 165 extern void module_remove_driver(struct device_driver *drv);
 166 #else
 167 static inline void module_add_driver(struct module *mod,
 168                                      struct device_driver *drv) { }
 169 static inline void module_remove_driver(struct device_driver *drv) { }
 170 #endif
 171
 172 #ifdef CONFIG_DEVTMPFS
 173 extern int devtmpfs_init(void);
 174 #else
 175 static inline int devtmpfs_init(void) { return 0; }
 176 #endif
 177
 178 /* Device links support */
 179 extern int device_links_read_lock(void);
 180 extern void device_links_read_unlock(int idx);
 181 extern int device_links_read_lock_held(void);
 182 extern int device_links_check_suppliers(struct device *dev);
 183 extern void device_links_driver_bound(struct device *dev);
 184 extern void device_links_driver_cleanup(struct device *dev);
 185 extern void device_links_no_driver(struct device *dev);
 186 extern bool device_links_busy(struct device *dev);
 187 extern void device_links_unbind_consumers(struct device *dev);
 188
 189 /* device pm support */
 190 void device_pm_move_to_tail(struct device *dev);
 191
 192 #ifdef CONFIG_DEVTMPFS
 193 int devtmpfs_create_node(struct device *dev);
 194 int devtmpfs_delete_node(struct device *dev);
 195 #else
 196 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
 197 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
 198 #endif