device.h: move 'struct bus' stuff out to device/bus.h

device.h has everything and the kitchen sink when it comes to struct
device things, so split out the struct bus things things to a separate
.h file to make things easier to maintain and manage over time.

Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Saravana Kannan <[email protected]>
Cc: Heikki Krogerus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

drivers/base/bus.c

@@ -9,6 +9,7 @@
  */
 
 #include <linux/async.h>
+#include <linux/device/bus.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/errno.h>

include/linux/device.h

@@ -26,6 +26,7 @@
 #include <linux/uidgid.h>
 #include <linux/gfp.h>
 #include <linux/overflow.h>
+#include <linux/device/bus.h>
 #include <asm/device.h>
 
 struct device;
@@ -35,7 +36,6 @@ struct driver_private;
 struct module;
 struct class;
 struct subsys_private;
-struct bus_type;
 struct device_node;
 struct fwnode_handle;
 struct iommu_ops;
@@ -44,269 +44,6 @@ struct iommu_fwspec;
 struct dev_pin_info;
 struct iommu_param;
 
-struct bus_attribute {
-	struct attribute	attr;
-	ssize_t (*show)(struct bus_type *bus, char *buf);
-	ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
-};
-
-#define BUS_ATTR_RW(_name) \
-	struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
-#define BUS_ATTR_RO(_name) \
-	struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
-#define BUS_ATTR_WO(_name) \
-	struct bus_attribute bus_attr_##_name = __ATTR_WO(_name)
-
-extern int __must_check bus_create_file(struct bus_type *,
-					struct bus_attribute *);
-extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
-
-/**
- * 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).
- * @dev_root:	Default device to use as the parent.
- * @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.
- *
- * @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.
- * @pm:		Power management operations of this bus, callback the specific
- *		device driver's pm-ops.
- * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
- *              driver implementations to a bus and allow the driver to do
- *              bus-specific setup
- * @p:		The private data of the driver core, only the driver core can
- *		touch this.
- * @lock_key:	Lock class key for use by the lock validator
- * @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;
-	struct device		*dev_root;
-	const struct attribute_group **bus_groups;
-	const struct attribute_group **dev_groups;
-	const struct attribute_group **drv_groups;
-
-	int (*match)(struct device *dev, struct device_driver *drv);
-	int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
-	int (*probe)(struct device *dev);
-	void (*sync_state)(struct device *dev);
-	int (*remove)(struct device *dev);
-	void (*shutdown)(struct device *dev);
-
-	int (*online)(struct device *dev);
-	int (*offline)(struct device *dev);
-
-	int (*suspend)(struct device *dev, pm_message_t state);
-	int (*resume)(struct device *dev);
-
-	int (*num_vf)(struct device *dev);
-
-	int (*dma_configure)(struct device *dev);
-
-	const struct dev_pm_ops *pm;
-
-	const struct iommu_ops *iommu_ops;
-
-	struct subsys_private *p;
-	struct lock_class_key lock_key;
-
-	bool need_parent_lock;
-};
-
-extern int __must_check bus_register(struct bus_type *bus);
-
-extern void bus_unregister(struct bus_type *bus);
-
-extern int __must_check bus_rescan_devices(struct bus_type *bus);
-
-/* iterator helpers for buses */
-struct subsys_dev_iter {
-	struct klist_iter		ki;
-	const struct device_type	*type;
-};
-void subsys_dev_iter_init(struct subsys_dev_iter *iter,
-			 struct bus_type *subsys,
-			 struct device *start,
-			 const struct device_type *type);
-struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
-void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
-
-int device_match_name(struct device *dev, const void *name);
-int device_match_of_node(struct device *dev, const void *np);
-int device_match_fwnode(struct device *dev, const void *fwnode);
-int device_match_devt(struct device *dev, const void *pdevt);
-int device_match_acpi_dev(struct device *dev, const void *adev);
-int device_match_any(struct device *dev, const void *unused);
-
-int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
-		     int (*fn)(struct device *dev, void *data));
-struct device *bus_find_device(struct bus_type *bus, struct device *start,
-			       const void *data,
-			       int (*match)(struct device *dev, const void *data));
-/**
- * bus_find_device_by_name - device iterator for locating a particular device
- * of a specific name.
- * @bus: bus type
- * @start: Device to begin with
- * @name: name of the device to match
- */
-static inline struct device *bus_find_device_by_name(struct bus_type *bus,
-						     struct device *start,
-						     const char *name)
-{
-	return bus_find_device(bus, start, name, device_match_name);
-}
-
-/**
- * bus_find_device_by_of_node : device iterator for locating a particular device
- * matching the of_node.
- * @bus: bus type
- * @np: of_node of the device to match.
- */
-static inline struct device *
-bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
-{
-	return bus_find_device(bus, NULL, np, device_match_of_node);
-}
-
-/**
- * bus_find_device_by_fwnode : device iterator for locating a particular device
- * matching the fwnode.
- * @bus: bus type
- * @fwnode: fwnode of the device to match.
- */
-static inline struct device *
-bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
-{
-	return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
-}
-
-/**
- * bus_find_device_by_devt : device iterator for locating a particular device
- * matching the device type.
- * @bus: bus type
- * @devt: device type of the device to match.
- */
-static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
-						     dev_t devt)
-{
-	return bus_find_device(bus, NULL, &devt, device_match_devt);
-}
-
-/**
- * bus_find_next_device - Find the next device after a given device in a
- * given bus.
- * @bus: bus type
- * @cur: device to begin the search with.
- */
-static inline struct device *
-bus_find_next_device(struct bus_type *bus,struct device *cur)
-{
-	return bus_find_device(bus, cur, NULL, device_match_any);
-}
-
-#ifdef CONFIG_ACPI
-struct acpi_device;
-
-/**
- * bus_find_device_by_acpi_dev : device iterator for locating a particular device
- * matching the ACPI COMPANION device.
- * @bus: bus type
- * @adev: ACPI COMPANION device to match.
- */
-static inline struct device *
-bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev)
-{
-	return bus_find_device(bus, NULL, adev, device_match_acpi_dev);
-}
-#else
-static inline struct device *
-bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev)
-{
-	return NULL;
-}
-#endif
-
-struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
-					struct device *hint);
-int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
-		     void *data, int (*fn)(struct device_driver *, void *));
-void bus_sort_breadthfirst(struct bus_type *bus,
-			   int (*compare)(const struct device *a,
-					  const struct device *b));
-/*
- * Bus notifiers: Get notified of addition/removal of devices
- * and binding/unbinding of drivers to devices.
- * In the long run, it should be a replacement for the platform
- * notify hooks.
- */
-struct notifier_block;
-
-extern int bus_register_notifier(struct bus_type *bus,
-				 struct notifier_block *nb);
-extern int bus_unregister_notifier(struct bus_type *bus,
-				   struct notifier_block *nb);
-
-/* All 4 notifers below get called with the target struct device *
- * as an argument. Note that those functions are likely to be called
- * with the device lock held in the core, so be careful.
- */
-#define BUS_NOTIFY_ADD_DEVICE		0x00000001 /* device added */
-#define BUS_NOTIFY_DEL_DEVICE		0x00000002 /* device to be removed */
-#define BUS_NOTIFY_REMOVED_DEVICE	0x00000003 /* device removed */
-#define BUS_NOTIFY_BIND_DRIVER		0x00000004 /* driver about to be
-						      bound */
-#define BUS_NOTIFY_BOUND_DRIVER		0x00000005 /* driver bound to device */
-#define BUS_NOTIFY_UNBIND_DRIVER	0x00000006 /* driver about to be
-						      unbound */
-#define BUS_NOTIFY_UNBOUND_DRIVER	0x00000007 /* driver is unbound
-						      from the device */
-#define BUS_NOTIFY_DRIVER_NOT_BOUND	0x00000008 /* driver fails to be bound */
-
-extern struct kset *bus_get_kset(struct bus_type *bus);
-extern struct klist *bus_get_device_klist(struct bus_type *bus);
-
 /**
  * enum probe_type - device driver probe type to try
  *	Device drivers may opt in for special handling of their