DEVTYPE=port DRIVER=port + l4( (  fB-  _I|+* // SPDX-License-Identifier: GPL-2.0 /* * bus.h - the bus-specific portions of the driver model * * Copyright (c) 2001-2003 Patrick Mochel * Copyright (c) 2004-2009 Greg Kroah-Hartman * Copyright (c) 2008-2009 Novell Inc. * Copyright (c) 2012-2019 Greg Kroah-Hartman * Copyright (c) 2012-2019 Linux Foundation * * See Documentation/driver-api/driver-model/ for more information. */ #ifndef _DEVICE_BUS_H_ #define _DEVICE_BUS_H_ #include #include #include struct device_driver; struct fwnode_handle; /** * struct bus_type - The bus type of the device * * @name: The name of the bus. * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id). * @bus_groups: Default attributes of the bus. * @dev_groups: Default attributes of the devices on the bus. * @drv_groups: Default attributes of the device drivers on the bus. * @match: Called, perhaps multiple times, whenever a new device or driver * is added for this bus. It should return a positive value if the * given device can be handled by the given driver and zero * otherwise. It may also return error code if determining that * the driver supports the device is not possible. In case of * -EPROBE_DEFER it will queue the device for deferred probing. * @uevent: Called when a device is added, removed, or a few other things * that generate uevents to add the environment variables. * @probe: Called when a new device or driver add to this bus, and callback * the specific driver's probe to initial the matched device. * @sync_state: Called to sync device state to software state after all the * state tracking consumers linked to this device (present at * the time of late_initcall) have successfully bound to a * driver. If the device has no consumers, this function will * be called at late_initcall_sync level. If the device has * consumers that are never bound to a driver, this function * will never get called until they do. * @remove: Called when a device removed from this bus. * @shutdown: Called at shut-down time to quiesce the device. * @irq_get_affinity: Get IRQ affinity mask for the device on this bus. * * @online: Called to put the device back online (after offlining it). * @offline: Called to put the device offline for hot-removal. May fail. * * @suspend: Called when a device on this bus wants to go to sleep mode. * @resume: Called to bring a device on this bus out of sleep mode. * @num_vf: Called to find out how many virtual functions a device on this * bus supports. * @dma_configure: Called to setup DMA configuration on a device on * this bus. * @dma_cleanup: Called to cleanup DMA configuration on a device on * this bus. * @pm: Power management operations of this bus, callback the specific * device driver's pm-ops. * @need_parent_lock: When probing or removing a device on this bus, the * device core should lock the device's parent. * * A bus is a channel between the processor and one or more devices. For the * purposes of the device model, all devices are connected via a bus, even if * it is an internal, virtual, "platform" bus. Buses can plug into each other. * A USB controller is usually a PCI device, for example. The device model * represents the actual connections between buses and the devices they control. * A bus is represented by the bus_type structure. It contains the name, the * default attributes, the bus' methods, PM operations, and the driver core's * private data. */ struct bus_type { const char *name; const char *dev_name; const struct attribute_group **bus_groups; const struct attribute_group **dev_groups; const struct attribute_group **drv_groups; int (*match)(struct device *dev, const struct device_driver *drv); int (*uevent)(const struct device *dev, struct kobj_uevent_env *env); int (*probe)(struct device *dev); void (*sync_state)(struct device *dev); void