3  * bus.h - the bus-specific portions of the driver model
25  * struct bus_type - The bus type of the device
27  * @name:	The name of the bus.
29  * @bus_groups:	Default attributes of the bus.
30  * @dev_groups:	Default attributes of the devices on the bus.
31  * @drv_groups: Default attributes of the device drivers on the bus.
33  *		is added for this bus. It should return a positive value if the
40  * @probe:	Called when a new device or driver add to this bus, and callback
49  * @remove:	Called when a device removed from this bus.
55  * @suspend:	Called when a device on this bus wants to go to sleep mode.
56  * @resume:	Called to bring a device on this bus out of sleep mode.
58  *		bus supports.
60  *			this bus.
62  *			this bus.
63  * @pm:		Power management operations of this bus, callback the specific
65  * @need_parent_lock:	When probing or removing a device on this bus, the
68  * A bus is a channel between the processor and one or more devices. For the
69  * purposes of the device model, all devices are connected via a bus, even if
70  * it is an internal, virtual, "platform" bus. Buses can plug into each other.
73  * A bus is represented by the bus_type structure. It contains the name, the
74  * default attributes, the bus' methods, PM operations, and the driver core's
107 int __must_check bus_register(const struct bus_type *bus);
109 void bus_unregister(const struct bus_type *bus);
111 int __must_check bus_rescan_devices(const struct bus_type *bus);
115 	ssize_t (*show)(const struct bus_type *bus, char *buf);
116 	ssize_t (*store)(const struct bus_type *bus, const char *buf, size_t count);
126 int __must_check bus_create_file(const struct bus_type *bus, struct bus_attribute *attr);
127 void bus_remove_file(const struct bus_type *bus, struct bus_attribute *attr);
142 int bus_for_each_dev(const struct bus_type *bus, struct device *start, void *data,
144 struct device *bus_find_device(const struct bus_type *bus, struct device *start,
149  * @bus: bus type
153 static inline struct device *bus_find_device_by_name(const struct bus_type *bus,  in bus_find_device_by_name()  argument
157 	return bus_find_device(bus, start, name, device_match_name);  in bus_find_device_by_name()
163  * @bus: bus type
167 bus_find_device_by_of_node(const struct bus_type *bus, const struct device_node *np)  in bus_find_device_by_of_node()  argument
169 	return bus_find_device(bus, NULL, np, device_match_of_node);  in bus_find_device_by_of_node()
175  * @bus: bus type
179 bus_find_device_by_fwnode(const struct bus_type *bus, const struct fwnode_handle *fwnode)  in bus_find_device_by_fwnode()  argument
181 	return bus_find_device(bus, NULL, fwnode, device_match_fwnode);  in bus_find_device_by_fwnode()
187  * @bus: bus type
190 static inline struct device *bus_find_device_by_devt(const struct bus_type *bus,  in bus_find_device_by_devt()  argument
193 	return bus_find_device(bus, NULL, &devt, device_match_devt);  in bus_find_device_by_devt()
198  * given bus.
199  * @bus: bus type
203 bus_find_next_device(const struct bus_type *bus,struct device *cur)  in bus_find_next_device()  argument
205 	return bus_find_device(bus, cur, NULL, device_match_any);  in bus_find_next_device()
214  * @bus: bus type
218 bus_find_device_by_acpi_dev(const struct bus_type *bus, const struct acpi_device *adev)  in bus_find_device_by_acpi_dev()  argument
220 	return bus_find_device(bus, NULL, adev, device_match_acpi_dev);  in bus_find_device_by_acpi_dev()
224 bus_find_device_by_acpi_dev(const struct bus_type *bus, const void *adev)  in bus_find_device_by_acpi_dev()  argument
230 int bus_for_each_drv(const struct bus_type *bus, struct device_driver *start,
232 void bus_sort_breadthfirst(const struct bus_type *bus,
236  * Bus notifiers: Get notified of addition/removal of devices
243 int bus_register_notifier(const struct bus_type *bus, struct notifier_block *nb);
244 int bus_unregister_notifier(const struct bus_type *bus, struct notifier_block *nb);
247  * enum bus_notifier_event - Bus Notifier events that have happened
248  * @BUS_NOTIFY_ADD_DEVICE: device is added to this bus
249  * @BUS_NOTIFY_DEL_DEVICE: device is about to be removed from this bus
250  * @BUS_NOTIFY_REMOVED_DEVICE: device is successfully removed from this bus
251  * @BUS_NOTIFY_BIND_DRIVER: a driver is about to be bound to this device on this bus
252  * @BUS_NOTIFY_BOUND_DRIVER: a driver is successfully bound to this device on this bus
253  * @BUS_NOTIFY_UNBIND_DRIVER: a driver is about to be unbound from this device on this bus
254  * @BUS_NOTIFY_UNBOUND_DRIVER: a driver is successfully unbound from this device on this bus
255  * @BUS_NOTIFY_DRIVER_NOT_BOUND: a driver failed to be bound to this device on this bus
257  * These are the value passed to a bus notifier when a specific event happens.
259  * Note that bus notifiers are likely to be called with the device lock already
263  * All bus notifiers are called with the target struct device * as an argument.
276 struct kset *bus_get_kset(const struct bus_type *bus);
277 struct device *bus_get_dev_root(const struct bus_type *bus);