1691 lines
58 KiB
C
1691 lines
58 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* device.h - generic, centralized driver model
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*
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* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
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* Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
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* Copyright (c) 2008-2009 Novell Inc.
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*
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* See Documentation/driver-api/driver-model/ for more information.
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*/
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#ifndef _DEVICE_H_
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#define _DEVICE_H_
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#include <linux/ioport.h>
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#include <linux/kobject.h>
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#include <linux/klist.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/atomic.h>
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#include <linux/ratelimit.h>
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#include <linux/uidgid.h>
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#include <linux/gfp.h>
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#include <linux/overflow.h>
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#include <asm/device.h>
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struct device;
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struct device_private;
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struct device_driver;
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struct driver_private;
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struct module;
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struct class;
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struct subsys_private;
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struct bus_type;
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struct device_node;
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struct fwnode_handle;
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struct iommu_ops;
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struct iommu_group;
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struct iommu_fwspec;
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struct dev_pin_info;
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struct iommu_param;
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struct bus_attribute {
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struct attribute attr;
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ssize_t (*show)(struct bus_type *bus, char *buf);
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ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
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};
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#define BUS_ATTR_RW(_name) \
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struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
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#define BUS_ATTR_RO(_name) \
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struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
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#define BUS_ATTR_WO(_name) \
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struct bus_attribute bus_attr_##_name = __ATTR_WO(_name)
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extern int __must_check bus_create_file(struct bus_type *,
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struct bus_attribute *);
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extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
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/**
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* struct bus_type - The bus type of the device
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*
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* @name: The name of the bus.
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* @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id).
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* @dev_root: Default device to use as the parent.
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* @bus_groups: Default attributes of the bus.
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* @dev_groups: Default attributes of the devices on the bus.
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* @drv_groups: Default attributes of the device drivers on the bus.
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* @match: Called, perhaps multiple times, whenever a new device or driver
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* is added for this bus. It should return a positive value if the
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* given device can be handled by the given driver and zero
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* otherwise. It may also return error code if determining that
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* the driver supports the device is not possible. In case of
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* -EPROBE_DEFER it will queue the device for deferred probing.
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* @uevent: Called when a device is added, removed, or a few other things
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* that generate uevents to add the environment variables.
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* @probe: Called when a new device or driver add to this bus, and callback
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* the specific driver's probe to initial the matched device.
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* @remove: Called when a device removed from this bus.
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* @shutdown: Called at shut-down time to quiesce the device.
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*
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* @online: Called to put the device back online (after offlining it).
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* @offline: Called to put the device offline for hot-removal. May fail.
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*
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* @suspend: Called when a device on this bus wants to go to sleep mode.
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* @resume: Called to bring a device on this bus out of sleep mode.
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* @num_vf: Called to find out how many virtual functions a device on this
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* bus supports.
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* @dma_configure: Called to setup DMA configuration on a device on
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* this bus.
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* @pm: Power management operations of this bus, callback the specific
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* device driver's pm-ops.
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* @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
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* driver implementations to a bus and allow the driver to do
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* bus-specific setup
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* @p: The private data of the driver core, only the driver core can
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* touch this.
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* @lock_key: Lock class key for use by the lock validator
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* @need_parent_lock: When probing or removing a device on this bus, the
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* device core should lock the device's parent.
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*
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* A bus is a channel between the processor and one or more devices. For the
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* purposes of the device model, all devices are connected via a bus, even if
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* it is an internal, virtual, "platform" bus. Buses can plug into each other.
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* A USB controller is usually a PCI device, for example. The device model
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* represents the actual connections between buses and the devices they control.
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* A bus is represented by the bus_type structure. It contains the name, the
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* default attributes, the bus' methods, PM operations, and the driver core's
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* private data.
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*/
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struct bus_type {
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const char *name;
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const char *dev_name;
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struct device *dev_root;
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const struct attribute_group **bus_groups;
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const struct attribute_group **dev_groups;
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const struct attribute_group **drv_groups;
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int (*match)(struct device *dev, struct device_driver *drv);
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int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
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int (*probe)(struct device *dev);
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int (*remove)(struct device *dev);
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void (*shutdown)(struct device *dev);
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int (*online)(struct device *dev);
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int (*offline)(struct device *dev);
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int (*suspend)(struct device *dev, pm_message_t state);
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int (*resume)(struct device *dev);
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int (*num_vf)(struct device *dev);
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int (*dma_configure)(struct device *dev);
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const struct dev_pm_ops *pm;
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const struct iommu_ops *iommu_ops;
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struct subsys_private *p;
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struct lock_class_key lock_key;
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bool need_parent_lock;
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};
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extern int __must_check bus_register(struct bus_type *bus);
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extern void bus_unregister(struct bus_type *bus);
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extern int __must_check bus_rescan_devices(struct bus_type *bus);
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/* iterator helpers for buses */
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struct subsys_dev_iter {
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struct klist_iter ki;
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const struct device_type *type;
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};
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void subsys_dev_iter_init(struct subsys_dev_iter *iter,
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struct bus_type *subsys,
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struct device *start,
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const struct device_type *type);
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struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
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void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
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int device_match_of_node(struct device *dev, const void *np);
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int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
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int (*fn)(struct device *dev, void *data));
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struct device *bus_find_device(struct bus_type *bus, struct device *start,
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const void *data,
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int (*match)(struct device *dev, const void *data));
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struct device *bus_find_device_by_name(struct bus_type *bus,
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struct device *start,
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const char *name);
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struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
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struct device *hint);
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int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
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void *data, int (*fn)(struct device_driver *, void *));
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void bus_sort_breadthfirst(struct bus_type *bus,
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int (*compare)(const struct device *a,
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const struct device *b));
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/*
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* Bus notifiers: Get notified of addition/removal of devices
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* and binding/unbinding of drivers to devices.
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* In the long run, it should be a replacement for the platform
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* notify hooks.
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*/
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struct notifier_block;
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extern int bus_register_notifier(struct bus_type *bus,
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struct notifier_block *nb);
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extern int bus_unregister_notifier(struct bus_type *bus,
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struct notifier_block *nb);
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/* All 4 notifers below get called with the target struct device *
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* as an argument. Note that those functions are likely to be called
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* with the device lock held in the core, so be careful.
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*/
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#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
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#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
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#define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
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#define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
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bound */
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#define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
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#define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
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unbound */
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#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
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from the device */
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#define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
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extern struct kset *bus_get_kset(struct bus_type *bus);
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extern struct klist *bus_get_device_klist(struct bus_type *bus);
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/**
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* enum probe_type - device driver probe type to try
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* Device drivers may opt in for special handling of their
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* respective probe routines. This tells the core what to
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* expect and prefer.
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*
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* @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
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* whether probed synchronously or asynchronously.
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* @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
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* probing order is not essential for booting the system may
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* opt into executing their probes asynchronously.
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* @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
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* their probe routines to run synchronously with driver and
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* device registration (with the exception of -EPROBE_DEFER
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* handling - re-probing always ends up being done asynchronously).
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*
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* Note that the end goal is to switch the kernel to use asynchronous
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* probing by default, so annotating drivers with
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* %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
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* to speed up boot process while we are validating the rest of the
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* drivers.
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*/
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enum probe_type {
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PROBE_DEFAULT_STRATEGY,
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PROBE_PREFER_ASYNCHRONOUS,
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PROBE_FORCE_SYNCHRONOUS,
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};
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/**
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* struct device_driver - The basic device driver structure
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* @name: Name of the device driver.
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* @bus: The bus which the device of this driver belongs to.
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* @owner: The module owner.
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* @mod_name: Used for built-in modules.
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* @suppress_bind_attrs: Disables bind/unbind via sysfs.
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* @probe_type: Type of the probe (synchronous or asynchronous) to use.
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* @of_match_table: The open firmware table.
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* @acpi_match_table: The ACPI match table.
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* @probe: Called to query the existence of a specific device,
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* whether this driver can work with it, and bind the driver
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* to a specific device.
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* @remove: Called when the device is removed from the system to
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* unbind a device from this driver.
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* @shutdown: Called at shut-down time to quiesce the device.
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* @suspend: Called to put the device to sleep mode. Usually to a
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* low power state.
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* @resume: Called to bring a device from sleep mode.
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* @groups: Default attributes that get created by the driver core
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* automatically.
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* @pm: Power management operations of the device which matched
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* this driver.
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* @coredump: Called when sysfs entry is written to. The device driver
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* is expected to call the dev_coredump API resulting in a
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* uevent.
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* @p: Driver core's private data, no one other than the driver
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* core can touch this.
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*
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* The device driver-model tracks all of the drivers known to the system.
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* The main reason for this tracking is to enable the driver core to match
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* up drivers with new devices. Once drivers are known objects within the
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* system, however, a number of other things become possible. Device drivers
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* can export information and configuration variables that are independent
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* of any specific device.
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*/
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struct device_driver {
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const char *name;
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struct bus_type *bus;
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struct module *owner;
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const char *mod_name; /* used for built-in modules */
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bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
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enum probe_type probe_type;
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const struct of_device_id *of_match_table;
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const struct acpi_device_id *acpi_match_table;
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int (*probe) (struct device *dev);
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int (*remove) (struct device *dev);
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void (*shutdown) (struct device *dev);
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int (*suspend) (struct device *dev, pm_message_t state);
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int (*resume) (struct device *dev);
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const struct attribute_group **groups;
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const struct dev_pm_ops *pm;
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void (*coredump) (struct device *dev);
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struct driver_private *p;
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};
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extern int __must_check driver_register(struct device_driver *drv);
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extern void driver_unregister(struct device_driver *drv);
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extern struct device_driver *driver_find(const char *name,
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struct bus_type *bus);
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extern int driver_probe_done(void);
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extern void wait_for_device_probe(void);
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/* sysfs interface for exporting driver attributes */
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struct driver_attribute {
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struct attribute attr;
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ssize_t (*show)(struct device_driver *driver, char *buf);
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ssize_t (*store)(struct device_driver *driver, const char *buf,
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size_t count);
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};
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#define DRIVER_ATTR_RW(_name) \
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struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
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#define DRIVER_ATTR_RO(_name) \
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struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
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#define DRIVER_ATTR_WO(_name) \
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struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
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extern int __must_check driver_create_file(struct device_driver *driver,
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const struct driver_attribute *attr);
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extern void driver_remove_file(struct device_driver *driver,
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const struct driver_attribute *attr);
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extern int __must_check driver_for_each_device(struct device_driver *drv,
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struct device *start,
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void *data,
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int (*fn)(struct device *dev,
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void *));
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struct device *driver_find_device(struct device_driver *drv,
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struct device *start, const void *data,
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int (*match)(struct device *dev, const void *data));
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void driver_deferred_probe_add(struct device *dev);
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int driver_deferred_probe_check_state(struct device *dev);
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int driver_deferred_probe_check_state_continue(struct device *dev);
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/**
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* struct subsys_interface - interfaces to device functions
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* @name: name of the device function
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* @subsys: subsytem of the devices to attach to
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* @node: the list of functions registered at the subsystem
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* @add_dev: device hookup to device function handler
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* @remove_dev: device hookup to device function handler
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*
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* Simple interfaces attached to a subsystem. Multiple interfaces can
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* attach to a subsystem and its devices. Unlike drivers, they do not
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* exclusively claim or control devices. Interfaces usually represent
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* a specific functionality of a subsystem/class of devices.
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*/
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struct subsys_interface {
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const char *name;
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struct bus_type *subsys;
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struct list_head node;
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int (*add_dev)(struct device *dev, struct subsys_interface *sif);
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void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
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};
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int subsys_interface_register(struct subsys_interface *sif);
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void subsys_interface_unregister(struct subsys_interface *sif);
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int subsys_system_register(struct bus_type *subsys,
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const struct attribute_group **groups);
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int subsys_virtual_register(struct bus_type *subsys,
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const struct attribute_group **groups);
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/**
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* struct class - device classes
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* @name: Name of the class.
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* @owner: The module owner.
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* @class_groups: Default attributes of this class.
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* @dev_groups: Default attributes of the devices that belong to the class.
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* @dev_kobj: The kobject that represents this class and links it into the hierarchy.
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* @dev_uevent: Called when a device is added, removed from this class, or a
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* few other things that generate uevents to add the environment
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* variables.
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* @devnode: Callback to provide the devtmpfs.
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* @class_release: Called to release this class.
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* @dev_release: Called to release the device.
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* @shutdown_pre: Called at shut-down time before driver shutdown.
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* @ns_type: Callbacks so sysfs can detemine namespaces.
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* @namespace: Namespace of the device belongs to this class.
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* @get_ownership: Allows class to specify uid/gid of the sysfs directories
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* for the devices belonging to the class. Usually tied to
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* device's namespace.
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* @pm: The default device power management operations of this class.
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* @p: The private data of the driver core, no one other than the
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* driver core can touch this.
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*
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* A class is a higher-level view of a device that abstracts out low-level
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* implementation details. Drivers may see a SCSI disk or an ATA disk, but,
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* at the class level, they are all simply disks. Classes allow user space
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* to work with devices based on what they do, rather than how they are
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* connected or how they work.
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*/
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struct class {
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const char *name;
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struct module *owner;
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const struct attribute_group **class_groups;
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const struct attribute_group **dev_groups;
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struct kobject *dev_kobj;
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int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
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char *(*devnode)(struct device *dev, umode_t *mode);
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void (*class_release)(struct class *class);
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void (*dev_release)(struct device *dev);
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int (*shutdown_pre)(struct device *dev);
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const struct kobj_ns_type_operations *ns_type;
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const void *(*namespace)(struct device *dev);
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void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid);
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const struct dev_pm_ops *pm;
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struct subsys_private *p;
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};
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struct class_dev_iter {
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struct klist_iter ki;
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const struct device_type *type;
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};
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extern struct kobject *sysfs_dev_block_kobj;
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extern struct kobject *sysfs_dev_char_kobj;
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extern int __must_check __class_register(struct class *class,
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struct lock_class_key *key);
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extern void class_unregister(struct class *class);
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/* This is a #define to keep the compiler from merging different
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* instances of the __key variable */
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#define class_register(class) \
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({ \
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static struct lock_class_key __key; \
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__class_register(class, &__key); \
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})
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struct class_compat;
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struct class_compat *class_compat_register(const char *name);
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void class_compat_unregister(struct class_compat *cls);
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int class_compat_create_link(struct class_compat *cls, struct device *dev,
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struct device *device_link);
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void class_compat_remove_link(struct class_compat *cls, struct device *dev,
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struct device *device_link);
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extern void class_dev_iter_init(struct class_dev_iter *iter,
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struct class *class,
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struct device *start,
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const struct device_type *type);
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extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
|
|
extern void class_dev_iter_exit(struct class_dev_iter *iter);
|
|
|
|
extern int class_for_each_device(struct class *class, struct device *start,
|
|
void *data,
|
|
int (*fn)(struct device *dev, void *data));
|
|
extern struct device *class_find_device(struct class *class,
|
|
struct device *start, const void *data,
|
|
int (*match)(struct device *, const void *));
|
|
|
|
struct class_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct class *class, struct class_attribute *attr,
|
|
char *buf);
|
|
ssize_t (*store)(struct class *class, struct class_attribute *attr,
|
|
const char *buf, size_t count);
|
|
};
|
|
|
|
#define CLASS_ATTR_RW(_name) \
|
|
struct class_attribute class_attr_##_name = __ATTR_RW(_name)
|
|
#define CLASS_ATTR_RO(_name) \
|
|
struct class_attribute class_attr_##_name = __ATTR_RO(_name)
|
|
#define CLASS_ATTR_WO(_name) \
|
|
struct class_attribute class_attr_##_name = __ATTR_WO(_name)
|
|
|
|
extern int __must_check class_create_file_ns(struct class *class,
|
|
const struct class_attribute *attr,
|
|
const void *ns);
|
|
extern void class_remove_file_ns(struct class *class,
|
|
const struct class_attribute *attr,
|
|
const void *ns);
|
|
|
|
static inline int __must_check class_create_file(struct class *class,
|
|
const struct class_attribute *attr)
|
|
{
|
|
return class_create_file_ns(class, attr, NULL);
|
|
}
|
|
|
|
static inline void class_remove_file(struct class *class,
|
|
const struct class_attribute *attr)
|
|
{
|
|
return class_remove_file_ns(class, attr, NULL);
|
|
}
|
|
|
|
/* Simple class attribute that is just a static string */
|
|
struct class_attribute_string {
|
|
struct class_attribute attr;
|
|
char *str;
|
|
};
|
|
|
|
/* Currently read-only only */
|
|
#define _CLASS_ATTR_STRING(_name, _mode, _str) \
|
|
{ __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
|
|
#define CLASS_ATTR_STRING(_name, _mode, _str) \
|
|
struct class_attribute_string class_attr_##_name = \
|
|
_CLASS_ATTR_STRING(_name, _mode, _str)
|
|
|
|
extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
|
|
char *buf);
|
|
|
|
struct class_interface {
|
|
struct list_head node;
|
|
struct class *class;
|
|
|
|
int (*add_dev) (struct device *, struct class_interface *);
|
|
void (*remove_dev) (struct device *, struct class_interface *);
|
|
};
|
|
|
|
extern int __must_check class_interface_register(struct class_interface *);
|
|
extern void class_interface_unregister(struct class_interface *);
|
|
|
|
extern struct class * __must_check __class_create(struct module *owner,
|
|
const char *name,
|
|
struct lock_class_key *key);
|
|
extern void class_destroy(struct class *cls);
|
|
|
|
/* This is a #define to keep the compiler from merging different
|
|
* instances of the __key variable */
|
|
#define class_create(owner, name) \
|
|
({ \
|
|
static struct lock_class_key __key; \
|
|
__class_create(owner, name, &__key); \
|
|
})
|
|
|
|
/*
|
|
* The type of device, "struct device" is embedded in. A class
|
|
* or bus can contain devices of different types
|
|
* like "partitions" and "disks", "mouse" and "event".
|
|
* This identifies the device type and carries type-specific
|
|
* information, equivalent to the kobj_type of a kobject.
|
|
* If "name" is specified, the uevent will contain it in
|
|
* the DEVTYPE variable.
|
|
*/
|
|
struct device_type {
|
|
const char *name;
|
|
const struct attribute_group **groups;
|
|
int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
|
|
char *(*devnode)(struct device *dev, umode_t *mode,
|
|
kuid_t *uid, kgid_t *gid);
|
|
void (*release)(struct device *dev);
|
|
|
|
const struct dev_pm_ops *pm;
|
|
};
|
|
|
|
/* interface for exporting device attributes */
|
|
struct device_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
ssize_t (*store)(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
};
|
|
|
|
struct dev_ext_attribute {
|
|
struct device_attribute attr;
|
|
void *var;
|
|
};
|
|
|
|
ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
|
|
char *buf);
|
|
ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
|
|
#define DEVICE_ATTR(_name, _mode, _show, _store) \
|
|
struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
|
|
#define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
|
|
struct device_attribute dev_attr_##_name = \
|
|
__ATTR_PREALLOC(_name, _mode, _show, _store)
|
|
#define DEVICE_ATTR_RW(_name) \
|
|
struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
|
|
#define DEVICE_ATTR_RO(_name) \
|
|
struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
|
|
#define DEVICE_ATTR_WO(_name) \
|
|
struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
|
|
#define DEVICE_ULONG_ATTR(_name, _mode, _var) \
|
|
struct dev_ext_attribute dev_attr_##_name = \
|
|
{ __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
|
|
#define DEVICE_INT_ATTR(_name, _mode, _var) \
|
|
struct dev_ext_attribute dev_attr_##_name = \
|
|
{ __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
|
|
#define DEVICE_BOOL_ATTR(_name, _mode, _var) \
|
|
struct dev_ext_attribute dev_attr_##_name = \
|
|
{ __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
|
|
#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
|
|
struct device_attribute dev_attr_##_name = \
|
|
__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
|
|
|
|
extern int device_create_file(struct device *device,
|
|
const struct device_attribute *entry);
|
|
extern void device_remove_file(struct device *dev,
|
|
const struct device_attribute *attr);
|
|
extern bool device_remove_file_self(struct device *dev,
|
|
const struct device_attribute *attr);
|
|
extern int __must_check device_create_bin_file(struct device *dev,
|
|
const struct bin_attribute *attr);
|
|
extern void device_remove_bin_file(struct device *dev,
|
|
const struct bin_attribute *attr);
|
|
|
|
/* device resource management */
|
|
typedef void (*dr_release_t)(struct device *dev, void *res);
|
|
typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
|
|
|
|
#ifdef CONFIG_DEBUG_DEVRES
|
|
extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
|
|
int nid, const char *name) __malloc;
|
|
#define devres_alloc(release, size, gfp) \
|
|
__devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
|
|
#define devres_alloc_node(release, size, gfp, nid) \
|
|
__devres_alloc_node(release, size, gfp, nid, #release)
|
|
#else
|
|
extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
|
|
int nid) __malloc;
|
|
static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
|
|
{
|
|
return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
|
|
}
|
|
#endif
|
|
|
|
extern void devres_for_each_res(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data,
|
|
void (*fn)(struct device *, void *, void *),
|
|
void *data);
|
|
extern void devres_free(void *res);
|
|
extern void devres_add(struct device *dev, void *res);
|
|
extern void *devres_find(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data);
|
|
extern void *devres_get(struct device *dev, void *new_res,
|
|
dr_match_t match, void *match_data);
|
|
extern void *devres_remove(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data);
|
|
extern int devres_destroy(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data);
|
|
extern int devres_release(struct device *dev, dr_release_t release,
|
|
dr_match_t match, void *match_data);
|
|
|
|
/* devres group */
|
|
extern void * __must_check devres_open_group(struct device *dev, void *id,
|
|
gfp_t gfp);
|
|
extern void devres_close_group(struct device *dev, void *id);
|
|
extern void devres_remove_group(struct device *dev, void *id);
|
|
extern int devres_release_group(struct device *dev, void *id);
|
|
|
|
/* managed devm_k.alloc/kfree for device drivers */
|
|
extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
|
|
extern __printf(3, 0)
|
|
char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
|
|
va_list ap) __malloc;
|
|
extern __printf(3, 4)
|
|
char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
|
|
static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
|
|
{
|
|
return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
|
|
}
|
|
static inline void *devm_kmalloc_array(struct device *dev,
|
|
size_t n, size_t size, gfp_t flags)
|
|
{
|
|
size_t bytes;
|
|
|
|
if (unlikely(check_mul_overflow(n, size, &bytes)))
|
|
return NULL;
|
|
|
|
return devm_kmalloc(dev, bytes, flags);
|
|
}
|
|
static inline void *devm_kcalloc(struct device *dev,
|
|
size_t n, size_t size, gfp_t flags)
|
|
{
|
|
return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
|
|
}
|
|
extern void devm_kfree(struct device *dev, const void *p);
|
|
extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
|
|
extern const char *devm_kstrdup_const(struct device *dev,
|
|
const char *s, gfp_t gfp);
|
|
extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
|
|
gfp_t gfp);
|
|
|
|
extern unsigned long devm_get_free_pages(struct device *dev,
|
|
gfp_t gfp_mask, unsigned int order);
|
|
extern void devm_free_pages(struct device *dev, unsigned long addr);
|
|
|
|
void __iomem *devm_ioremap_resource(struct device *dev,
|
|
const struct resource *res);
|
|
|
|
void __iomem *devm_of_iomap(struct device *dev,
|
|
struct device_node *node, int index,
|
|
resource_size_t *size);
|
|
|
|
/* allows to add/remove a custom action to devres stack */
|
|
int devm_add_action(struct device *dev, void (*action)(void *), void *data);
|
|
void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
|
|
void devm_release_action(struct device *dev, void (*action)(void *), void *data);
|
|
|
|
static inline int devm_add_action_or_reset(struct device *dev,
|
|
void (*action)(void *), void *data)
|
|
{
|
|
int ret;
|
|
|
|
ret = devm_add_action(dev, action, data);
|
|
if (ret)
|
|
action(data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* devm_alloc_percpu - Resource-managed alloc_percpu
|
|
* @dev: Device to allocate per-cpu memory for
|
|
* @type: Type to allocate per-cpu memory for
|
|
*
|
|
* Managed alloc_percpu. Per-cpu memory allocated with this function is
|
|
* automatically freed on driver detach.
|
|
*
|
|
* RETURNS:
|
|
* Pointer to allocated memory on success, NULL on failure.
|
|
*/
|
|
#define devm_alloc_percpu(dev, type) \
|
|
((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
|
|
__alignof__(type)))
|
|
|
|
void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
|
|
size_t align);
|
|
void devm_free_percpu(struct device *dev, void __percpu *pdata);
|
|
|
|
struct device_dma_parameters {
|
|
/*
|
|
* a low level driver may set these to teach IOMMU code about
|
|
* sg limitations.
|
|
*/
|
|
unsigned int max_segment_size;
|
|
unsigned long segment_boundary_mask;
|
|
};
|
|
|
|
/**
|
|
* struct device_connection - Device Connection Descriptor
|
|
* @fwnode: The device node of the connected device
|
|
* @endpoint: The names of the two devices connected together
|
|
* @id: Unique identifier for the connection
|
|
* @list: List head, private, for internal use only
|
|
*
|
|
* NOTE: @fwnode is not used together with @endpoint. @fwnode is used when
|
|
* platform firmware defines the connection. When the connection is registered
|
|
* with device_connection_add() @endpoint is used instead.
|
|
*/
|
|
struct device_connection {
|
|
struct fwnode_handle *fwnode;
|
|
const char *endpoint[2];
|
|
const char *id;
|
|
struct list_head list;
|
|
};
|
|
|
|
void *device_connection_find_match(struct device *dev, const char *con_id,
|
|
void *data,
|
|
void *(*match)(struct device_connection *con,
|
|
int ep, void *data));
|
|
|
|
struct device *device_connection_find(struct device *dev, const char *con_id);
|
|
|
|
void device_connection_add(struct device_connection *con);
|
|
void device_connection_remove(struct device_connection *con);
|
|
|
|
/**
|
|
* device_connections_add - Add multiple device connections at once
|
|
* @cons: Zero terminated array of device connection descriptors
|
|
*/
|
|
static inline void device_connections_add(struct device_connection *cons)
|
|
{
|
|
struct device_connection *c;
|
|
|
|
for (c = cons; c->endpoint[0]; c++)
|
|
device_connection_add(c);
|
|
}
|
|
|
|
/**
|
|
* device_connections_remove - Remove multiple device connections at once
|
|
* @cons: Zero terminated array of device connection descriptors
|
|
*/
|
|
static inline void device_connections_remove(struct device_connection *cons)
|
|
{
|
|
struct device_connection *c;
|
|
|
|
for (c = cons; c->endpoint[0]; c++)
|
|
device_connection_remove(c);
|
|
}
|
|
|
|
/**
|
|
* enum device_link_state - Device link states.
|
|
* @DL_STATE_NONE: The presence of the drivers is not being tracked.
|
|
* @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
|
|
* @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
|
|
* @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
|
|
* @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
|
|
* @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
|
|
*/
|
|
enum device_link_state {
|
|
DL_STATE_NONE = -1,
|
|
DL_STATE_DORMANT = 0,
|
|
DL_STATE_AVAILABLE,
|
|
DL_STATE_CONSUMER_PROBE,
|
|
DL_STATE_ACTIVE,
|
|
DL_STATE_SUPPLIER_UNBIND,
|
|
};
|
|
|
|
/*
|
|
* Device link flags.
|
|
*
|
|
* STATELESS: The core won't track the presence of supplier/consumer drivers.
|
|
* AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
|
|
* PM_RUNTIME: If set, the runtime PM framework will use this link.
|
|
* RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
|
|
* AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
|
|
* AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
|
|
*/
|
|
#define DL_FLAG_STATELESS BIT(0)
|
|
#define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
|
|
#define DL_FLAG_PM_RUNTIME BIT(2)
|
|
#define DL_FLAG_RPM_ACTIVE BIT(3)
|
|
#define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
|
|
#define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
|
|
|
|
/**
|
|
* struct device_link - Device link representation.
|
|
* @supplier: The device on the supplier end of the link.
|
|
* @s_node: Hook to the supplier device's list of links to consumers.
|
|
* @consumer: The device on the consumer end of the link.
|
|
* @c_node: Hook to the consumer device's list of links to suppliers.
|
|
* @status: The state of the link (with respect to the presence of drivers).
|
|
* @flags: Link flags.
|
|
* @rpm_active: Whether or not the consumer device is runtime-PM-active.
|
|
* @kref: Count repeated addition of the same link.
|
|
* @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
|
|
* @supplier_preactivated: Supplier has been made active before consumer probe.
|
|
*/
|
|
struct device_link {
|
|
struct device *supplier;
|
|
struct list_head s_node;
|
|
struct device *consumer;
|
|
struct list_head c_node;
|
|
enum device_link_state status;
|
|
u32 flags;
|
|
refcount_t rpm_active;
|
|
struct kref kref;
|
|
#ifdef CONFIG_SRCU
|
|
struct rcu_head rcu_head;
|
|
#endif
|
|
bool supplier_preactivated; /* Owned by consumer probe. */
|
|
};
|
|
|
|
/**
|
|
* enum dl_dev_state - Device driver presence tracking information.
|
|
* @DL_DEV_NO_DRIVER: There is no driver attached to the device.
|
|
* @DL_DEV_PROBING: A driver is probing.
|
|
* @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
|
|
* @DL_DEV_UNBINDING: The driver is unbinding from the device.
|
|
*/
|
|
enum dl_dev_state {
|
|
DL_DEV_NO_DRIVER = 0,
|
|
DL_DEV_PROBING,
|
|
DL_DEV_DRIVER_BOUND,
|
|
DL_DEV_UNBINDING,
|
|
};
|
|
|
|
/**
|
|
* struct dev_links_info - Device data related to device links.
|
|
* @suppliers: List of links to supplier devices.
|
|
* @consumers: List of links to consumer devices.
|
|
* @status: Driver status information.
|
|
*/
|
|
struct dev_links_info {
|
|
struct list_head suppliers;
|
|
struct list_head consumers;
|
|
enum dl_dev_state status;
|
|
};
|
|
|
|
/**
|
|
* struct device - The basic device structure
|
|
* @parent: The device's "parent" device, the device to which it is attached.
|
|
* In most cases, a parent device is some sort of bus or host
|
|
* controller. If parent is NULL, the device, is a top-level device,
|
|
* which is not usually what you want.
|
|
* @p: Holds the private data of the driver core portions of the device.
|
|
* See the comment of the struct device_private for detail.
|
|
* @kobj: A top-level, abstract class from which other classes are derived.
|
|
* @init_name: Initial name of the device.
|
|
* @type: The type of device.
|
|
* This identifies the device type and carries type-specific
|
|
* information.
|
|
* @mutex: Mutex to synchronize calls to its driver.
|
|
* @lockdep_mutex: An optional debug lock that a subsystem can use as a
|
|
* peer lock to gain localized lockdep coverage of the device_lock.
|
|
* @bus: Type of bus device is on.
|
|
* @driver: Which driver has allocated this
|
|
* @platform_data: Platform data specific to the device.
|
|
* Example: For devices on custom boards, as typical of embedded
|
|
* and SOC based hardware, Linux often uses platform_data to point
|
|
* to board-specific structures describing devices and how they
|
|
* are wired. That can include what ports are available, chip
|
|
* variants, which GPIO pins act in what additional roles, and so
|
|
* on. This shrinks the "Board Support Packages" (BSPs) and
|
|
* minimizes board-specific #ifdefs in drivers.
|
|
* @driver_data: Private pointer for driver specific info.
|
|
* @links: Links to suppliers and consumers of this device.
|
|
* @power: For device power management.
|
|
* See Documentation/driver-api/pm/devices.rst for details.
|
|
* @pm_domain: Provide callbacks that are executed during system suspend,
|
|
* hibernation, system resume and during runtime PM transitions
|
|
* along with subsystem-level and driver-level callbacks.
|
|
* @pins: For device pin management.
|
|
* See Documentation/driver-api/pinctl.rst for details.
|
|
* @msi_list: Hosts MSI descriptors
|
|
* @msi_domain: The generic MSI domain this device is using.
|
|
* @numa_node: NUMA node this device is close to.
|
|
* @dma_ops: DMA mapping operations for this device.
|
|
* @dma_mask: Dma mask (if dma'ble device).
|
|
* @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
|
|
* hardware supports 64-bit addresses for consistent allocations
|
|
* such descriptors.
|
|
* @bus_dma_mask: Mask of an upstream bridge or bus which imposes a smaller DMA
|
|
* limit than the device itself supports.
|
|
* @dma_pfn_offset: offset of DMA memory range relatively of RAM
|
|
* @dma_parms: A low level driver may set these to teach IOMMU code about
|
|
* segment limitations.
|
|
* @dma_pools: Dma pools (if dma'ble device).
|
|
* @dma_mem: Internal for coherent mem override.
|
|
* @cma_area: Contiguous memory area for dma allocations
|
|
* @archdata: For arch-specific additions.
|
|
* @of_node: Associated device tree node.
|
|
* @fwnode: Associated device node supplied by platform firmware.
|
|
* @devt: For creating the sysfs "dev".
|
|
* @id: device instance
|
|
* @devres_lock: Spinlock to protect the resource of the device.
|
|
* @devres_head: The resources list of the device.
|
|
* @knode_class: The node used to add the device to the class list.
|
|
* @class: The class of the device.
|
|
* @groups: Optional attribute groups.
|
|
* @release: Callback to free the device after all references have
|
|
* gone away. This should be set by the allocator of the
|
|
* device (i.e. the bus driver that discovered the device).
|
|
* @iommu_group: IOMMU group the device belongs to.
|
|
* @iommu_fwspec: IOMMU-specific properties supplied by firmware.
|
|
* @iommu_param: Per device generic IOMMU runtime data
|
|
*
|
|
* @offline_disabled: If set, the device is permanently online.
|
|
* @offline: Set after successful invocation of bus type's .offline().
|
|
* @of_node_reused: Set if the device-tree node is shared with an ancestor
|
|
* device.
|
|
* @dma_coherent: this particular device is dma coherent, even if the
|
|
* architecture supports non-coherent devices.
|
|
*
|
|
* At the lowest level, every device in a Linux system is represented by an
|
|
* instance of struct device. The device structure contains the information
|
|
* that the device model core needs to model the system. Most subsystems,
|
|
* however, track additional information about the devices they host. As a
|
|
* result, it is rare for devices to be represented by bare device structures;
|
|
* instead, that structure, like kobject structures, is usually embedded within
|
|
* a higher-level representation of the device.
|
|
*/
|
|
struct device {
|
|
struct kobject kobj;
|
|
struct device *parent;
|
|
|
|
struct device_private *p;
|
|
|
|
const char *init_name; /* initial name of the device */
|
|
const struct device_type *type;
|
|
|
|
struct bus_type *bus; /* type of bus device is on */
|
|
struct device_driver *driver; /* which driver has allocated this
|
|
device */
|
|
void *platform_data; /* Platform specific data, device
|
|
core doesn't touch it */
|
|
void *driver_data; /* Driver data, set and get with
|
|
dev_set_drvdata/dev_get_drvdata */
|
|
#ifdef CONFIG_PROVE_LOCKING
|
|
struct mutex lockdep_mutex;
|
|
#endif
|
|
struct mutex mutex; /* mutex to synchronize calls to
|
|
* its driver.
|
|
*/
|
|
|
|
struct dev_links_info links;
|
|
struct dev_pm_info power;
|
|
struct dev_pm_domain *pm_domain;
|
|
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
|
|
struct irq_domain *msi_domain;
|
|
#endif
|
|
#ifdef CONFIG_PINCTRL
|
|
struct dev_pin_info *pins;
|
|
#endif
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ
|
|
struct list_head msi_list;
|
|
#endif
|
|
|
|
const struct dma_map_ops *dma_ops;
|
|
u64 *dma_mask; /* dma mask (if dma'able device) */
|
|
u64 coherent_dma_mask;/* Like dma_mask, but for
|
|
alloc_coherent mappings as
|
|
not all hardware supports
|
|
64 bit addresses for consistent
|
|
allocations such descriptors. */
|
|
u64 bus_dma_mask; /* upstream dma_mask constraint */
|
|
unsigned long dma_pfn_offset;
|
|
|
|
struct device_dma_parameters *dma_parms;
|
|
|
|
struct list_head dma_pools; /* dma pools (if dma'ble) */
|
|
|
|
#ifdef CONFIG_DMA_DECLARE_COHERENT
|
|
struct dma_coherent_mem *dma_mem; /* internal for coherent mem
|
|
override */
|
|
#endif
|
|
#ifdef CONFIG_DMA_CMA
|
|
struct cma *cma_area; /* contiguous memory area for dma
|
|
allocations */
|
|
#endif
|
|
/* arch specific additions */
|
|
struct dev_archdata archdata;
|
|
|
|
struct device_node *of_node; /* associated device tree node */
|
|
struct fwnode_handle *fwnode; /* firmware device node */
|
|
|
|
#ifdef CONFIG_NUMA
|
|
int numa_node; /* NUMA node this device is close to */
|
|
#endif
|
|
dev_t devt; /* dev_t, creates the sysfs "dev" */
|
|
u32 id; /* device instance */
|
|
|
|
spinlock_t devres_lock;
|
|
struct list_head devres_head;
|
|
|
|
struct class *class;
|
|
const struct attribute_group **groups; /* optional groups */
|
|
|
|
void (*release)(struct device *dev);
|
|
struct iommu_group *iommu_group;
|
|
struct iommu_fwspec *iommu_fwspec;
|
|
struct iommu_param *iommu_param;
|
|
|
|
bool offline_disabled:1;
|
|
bool offline:1;
|
|
bool of_node_reused:1;
|
|
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
|
|
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
|
|
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
|
|
bool dma_coherent:1;
|
|
#endif
|
|
};
|
|
|
|
static inline struct device *kobj_to_dev(struct kobject *kobj)
|
|
{
|
|
return container_of(kobj, struct device, kobj);
|
|
}
|
|
|
|
/**
|
|
* device_iommu_mapped - Returns true when the device DMA is translated
|
|
* by an IOMMU
|
|
* @dev: Device to perform the check on
|
|
*/
|
|
static inline bool device_iommu_mapped(struct device *dev)
|
|
{
|
|
return (dev->iommu_group != NULL);
|
|
}
|
|
|
|
/* Get the wakeup routines, which depend on struct device */
|
|
#include <linux/pm_wakeup.h>
|
|
|
|
static inline const char *dev_name(const struct device *dev)
|
|
{
|
|
/* Use the init name until the kobject becomes available */
|
|
if (dev->init_name)
|
|
return dev->init_name;
|
|
|
|
return kobject_name(&dev->kobj);
|
|
}
|
|
|
|
extern __printf(2, 3)
|
|
int dev_set_name(struct device *dev, const char *name, ...);
|
|
|
|
#ifdef CONFIG_NUMA
|
|
static inline int dev_to_node(struct device *dev)
|
|
{
|
|
return dev->numa_node;
|
|
}
|
|
static inline void set_dev_node(struct device *dev, int node)
|
|
{
|
|
dev->numa_node = node;
|
|
}
|
|
#else
|
|
static inline int dev_to_node(struct device *dev)
|
|
{
|
|
return NUMA_NO_NODE;
|
|
}
|
|
static inline void set_dev_node(struct device *dev, int node)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
|
|
{
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
|
|
return dev->msi_domain;
|
|
#else
|
|
return NULL;
|
|
#endif
|
|
}
|
|
|
|
static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
|
|
{
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
|
|
dev->msi_domain = d;
|
|
#endif
|
|
}
|
|
|
|
static inline void *dev_get_drvdata(const struct device *dev)
|
|
{
|
|
return dev->driver_data;
|
|
}
|
|
|
|
static inline void dev_set_drvdata(struct device *dev, void *data)
|
|
{
|
|
dev->driver_data = data;
|
|
}
|
|
|
|
static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
|
|
{
|
|
return dev ? dev->power.subsys_data : NULL;
|
|
}
|
|
|
|
static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
|
|
{
|
|
return dev->kobj.uevent_suppress;
|
|
}
|
|
|
|
static inline void dev_set_uevent_suppress(struct device *dev, int val)
|
|
{
|
|
dev->kobj.uevent_suppress = val;
|
|
}
|
|
|
|
static inline int device_is_registered(struct device *dev)
|
|
{
|
|
return dev->kobj.state_in_sysfs;
|
|
}
|
|
|
|
static inline void device_enable_async_suspend(struct device *dev)
|
|
{
|
|
if (!dev->power.is_prepared)
|
|
dev->power.async_suspend = true;
|
|
}
|
|
|
|
static inline void device_disable_async_suspend(struct device *dev)
|
|
{
|
|
if (!dev->power.is_prepared)
|
|
dev->power.async_suspend = false;
|
|
}
|
|
|
|
static inline bool device_async_suspend_enabled(struct device *dev)
|
|
{
|
|
return !!dev->power.async_suspend;
|
|
}
|
|
|
|
static inline bool device_pm_not_required(struct device *dev)
|
|
{
|
|
return dev->power.no_pm;
|
|
}
|
|
|
|
static inline void device_set_pm_not_required(struct device *dev)
|
|
{
|
|
dev->power.no_pm = true;
|
|
}
|
|
|
|
static inline void dev_pm_syscore_device(struct device *dev, bool val)
|
|
{
|
|
#ifdef CONFIG_PM_SLEEP
|
|
dev->power.syscore = val;
|
|
#endif
|
|
}
|
|
|
|
static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
|
|
{
|
|
dev->power.driver_flags = flags;
|
|
}
|
|
|
|
static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
|
|
{
|
|
return !!(dev->power.driver_flags & flags);
|
|
}
|
|
|
|
static inline void device_lock(struct device *dev)
|
|
{
|
|
mutex_lock(&dev->mutex);
|
|
}
|
|
|
|
static inline int device_lock_interruptible(struct device *dev)
|
|
{
|
|
return mutex_lock_interruptible(&dev->mutex);
|
|
}
|
|
|
|
static inline int device_trylock(struct device *dev)
|
|
{
|
|
return mutex_trylock(&dev->mutex);
|
|
}
|
|
|
|
static inline void device_unlock(struct device *dev)
|
|
{
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
|
|
static inline void device_lock_assert(struct device *dev)
|
|
{
|
|
lockdep_assert_held(&dev->mutex);
|
|
}
|
|
|
|
static inline struct device_node *dev_of_node(struct device *dev)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_OF) || !dev)
|
|
return NULL;
|
|
return dev->of_node;
|
|
}
|
|
|
|
void driver_init(void);
|
|
|
|
/*
|
|
* High level routines for use by the bus drivers
|
|
*/
|
|
extern int __must_check device_register(struct device *dev);
|
|
extern void device_unregister(struct device *dev);
|
|
extern void device_initialize(struct device *dev);
|
|
extern int __must_check device_add(struct device *dev);
|
|
extern void device_del(struct device *dev);
|
|
extern int device_for_each_child(struct device *dev, void *data,
|
|
int (*fn)(struct device *dev, void *data));
|
|
extern int device_for_each_child_reverse(struct device *dev, void *data,
|
|
int (*fn)(struct device *dev, void *data));
|
|
extern struct device *device_find_child(struct device *dev, void *data,
|
|
int (*match)(struct device *dev, void *data));
|
|
extern struct device *device_find_child_by_name(struct device *parent,
|
|
const char *name);
|
|
extern int device_rename(struct device *dev, const char *new_name);
|
|
extern int device_move(struct device *dev, struct device *new_parent,
|
|
enum dpm_order dpm_order);
|
|
extern const char *device_get_devnode(struct device *dev,
|
|
umode_t *mode, kuid_t *uid, kgid_t *gid,
|
|
const char **tmp);
|
|
|
|
static inline bool device_supports_offline(struct device *dev)
|
|
{
|
|
return dev->bus && dev->bus->offline && dev->bus->online;
|
|
}
|
|
|
|
extern void lock_device_hotplug(void);
|
|
extern void unlock_device_hotplug(void);
|
|
extern int lock_device_hotplug_sysfs(void);
|
|
extern int device_offline(struct device *dev);
|
|
extern int device_online(struct device *dev);
|
|
extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
|
|
extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
|
|
void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
|
|
|
|
static inline int dev_num_vf(struct device *dev)
|
|
{
|
|
if (dev->bus && dev->bus->num_vf)
|
|
return dev->bus->num_vf(dev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Root device objects for grouping under /sys/devices
|
|
*/
|
|
extern struct device *__root_device_register(const char *name,
|
|
struct module *owner);
|
|
|
|
/* This is a macro to avoid include problems with THIS_MODULE */
|
|
#define root_device_register(name) \
|
|
__root_device_register(name, THIS_MODULE)
|
|
|
|
extern void root_device_unregister(struct device *root);
|
|
|
|
static inline void *dev_get_platdata(const struct device *dev)
|
|
{
|
|
return dev->platform_data;
|
|
}
|
|
|
|
/*
|
|
* Manual binding of a device to driver. See drivers/base/bus.c
|
|
* for information on use.
|
|
*/
|
|
extern int __must_check device_bind_driver(struct device *dev);
|
|
extern void device_release_driver(struct device *dev);
|
|
extern int __must_check device_attach(struct device *dev);
|
|
extern int __must_check driver_attach(struct device_driver *drv);
|
|
extern void device_initial_probe(struct device *dev);
|
|
extern int __must_check device_reprobe(struct device *dev);
|
|
|
|
extern bool device_is_bound(struct device *dev);
|
|
|
|
/*
|
|
* Easy functions for dynamically creating devices on the fly
|
|
*/
|
|
extern __printf(5, 0)
|
|
struct device *device_create_vargs(struct class *cls, struct device *parent,
|
|
dev_t devt, void *drvdata,
|
|
const char *fmt, va_list vargs);
|
|
extern __printf(5, 6)
|
|
struct device *device_create(struct class *cls, struct device *parent,
|
|
dev_t devt, void *drvdata,
|
|
const char *fmt, ...);
|
|
extern __printf(6, 7)
|
|
struct device *device_create_with_groups(struct class *cls,
|
|
struct device *parent, dev_t devt, void *drvdata,
|
|
const struct attribute_group **groups,
|
|
const char *fmt, ...);
|
|
extern void device_destroy(struct class *cls, dev_t devt);
|
|
|
|
extern int __must_check device_add_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
extern void device_remove_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
|
|
static inline int __must_check device_add_group(struct device *dev,
|
|
const struct attribute_group *grp)
|
|
{
|
|
const struct attribute_group *groups[] = { grp, NULL };
|
|
|
|
return device_add_groups(dev, groups);
|
|
}
|
|
|
|
static inline void device_remove_group(struct device *dev,
|
|
const struct attribute_group *grp)
|
|
{
|
|
const struct attribute_group *groups[] = { grp, NULL };
|
|
|
|
return device_remove_groups(dev, groups);
|
|
}
|
|
|
|
extern int __must_check devm_device_add_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
extern void devm_device_remove_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
extern int __must_check devm_device_add_group(struct device *dev,
|
|
const struct attribute_group *grp);
|
|
extern void devm_device_remove_group(struct device *dev,
|
|
const struct attribute_group *grp);
|
|
|
|
/*
|
|
* Platform "fixup" functions - allow the platform to have their say
|
|
* about devices and actions that the general device layer doesn't
|
|
* know about.
|
|
*/
|
|
/* Notify platform of device discovery */
|
|
extern int (*platform_notify)(struct device *dev);
|
|
|
|
extern int (*platform_notify_remove)(struct device *dev);
|
|
|
|
|
|
/*
|
|
* get_device - atomically increment the reference count for the device.
|
|
*
|
|
*/
|
|
extern struct device *get_device(struct device *dev);
|
|
extern void put_device(struct device *dev);
|
|
extern bool kill_device(struct device *dev);
|
|
|
|
#ifdef CONFIG_DEVTMPFS
|
|
extern int devtmpfs_create_node(struct device *dev);
|
|
extern int devtmpfs_delete_node(struct device *dev);
|
|
extern int devtmpfs_mount(const char *mntdir);
|
|
#else
|
|
static inline int devtmpfs_create_node(struct device *dev) { return 0; }
|
|
static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
|
|
static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
|
|
#endif
|
|
|
|
/* drivers/base/power/shutdown.c */
|
|
extern void device_shutdown(void);
|
|
|
|
/* debugging and troubleshooting/diagnostic helpers. */
|
|
extern const char *dev_driver_string(const struct device *dev);
|
|
|
|
/* Device links interface. */
|
|
struct device_link *device_link_add(struct device *consumer,
|
|
struct device *supplier, u32 flags);
|
|
void device_link_del(struct device_link *link);
|
|
void device_link_remove(void *consumer, struct device *supplier);
|
|
|
|
#ifndef dev_fmt
|
|
#define dev_fmt(fmt) fmt
|
|
#endif
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
|
|
__printf(3, 0) __cold
|
|
int dev_vprintk_emit(int level, const struct device *dev,
|
|
const char *fmt, va_list args);
|
|
__printf(3, 4) __cold
|
|
int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
|
|
|
|
__printf(3, 4) __cold
|
|
void dev_printk(const char *level, const struct device *dev,
|
|
const char *fmt, ...);
|
|
__printf(2, 3) __cold
|
|
void _dev_emerg(const struct device *dev, const char *fmt, ...);
|
|
__printf(2, 3) __cold
|
|
void _dev_alert(const struct device *dev, const char *fmt, ...);
|
|
__printf(2, 3) __cold
|
|
void _dev_crit(const struct device *dev, const char *fmt, ...);
|
|
__printf(2, 3) __cold
|
|
void _dev_err(const struct device *dev, const char *fmt, ...);
|
|
__printf(2, 3) __cold
|
|
void _dev_warn(const struct device *dev, const char *fmt, ...);
|
|
__printf(2, 3) __cold
|
|
void _dev_notice(const struct device *dev, const char *fmt, ...);
|
|
__printf(2, 3) __cold
|
|
void _dev_info(const struct device *dev, const char *fmt, ...);
|
|
|
|
#else
|
|
|
|
static inline __printf(3, 0)
|
|
int dev_vprintk_emit(int level, const struct device *dev,
|
|
const char *fmt, va_list args)
|
|
{ return 0; }
|
|
static inline __printf(3, 4)
|
|
int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
|
|
{ return 0; }
|
|
|
|
static inline void __dev_printk(const char *level, const struct device *dev,
|
|
struct va_format *vaf)
|
|
{}
|
|
static inline __printf(3, 4)
|
|
void dev_printk(const char *level, const struct device *dev,
|
|
const char *fmt, ...)
|
|
{}
|
|
|
|
static inline __printf(2, 3)
|
|
void _dev_emerg(const struct device *dev, const char *fmt, ...)
|
|
{}
|
|
static inline __printf(2, 3)
|
|
void _dev_crit(const struct device *dev, const char *fmt, ...)
|
|
{}
|
|
static inline __printf(2, 3)
|
|
void _dev_alert(const struct device *dev, const char *fmt, ...)
|
|
{}
|
|
static inline __printf(2, 3)
|
|
void _dev_err(const struct device *dev, const char *fmt, ...)
|
|
{}
|
|
static inline __printf(2, 3)
|
|
void _dev_warn(const struct device *dev, const char *fmt, ...)
|
|
{}
|
|
static inline __printf(2, 3)
|
|
void _dev_notice(const struct device *dev, const char *fmt, ...)
|
|
{}
|
|
static inline __printf(2, 3)
|
|
void _dev_info(const struct device *dev, const char *fmt, ...)
|
|
{}
|
|
|
|
#endif
|
|
|
|
/*
|
|
* #defines for all the dev_<level> macros to prefix with whatever
|
|
* possible use of #define dev_fmt(fmt) ...
|
|
*/
|
|
|
|
#define dev_emerg(dev, fmt, ...) \
|
|
_dev_emerg(dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
#define dev_crit(dev, fmt, ...) \
|
|
_dev_crit(dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
#define dev_alert(dev, fmt, ...) \
|
|
_dev_alert(dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
#define dev_err(dev, fmt, ...) \
|
|
_dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
#define dev_warn(dev, fmt, ...) \
|
|
_dev_warn(dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
#define dev_notice(dev, fmt, ...) \
|
|
_dev_notice(dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
#define dev_info(dev, fmt, ...) \
|
|
_dev_info(dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
|
|
#if defined(CONFIG_DYNAMIC_DEBUG)
|
|
#define dev_dbg(dev, fmt, ...) \
|
|
dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
#elif defined(DEBUG)
|
|
#define dev_dbg(dev, fmt, ...) \
|
|
dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
|
|
#else
|
|
#define dev_dbg(dev, fmt, ...) \
|
|
({ \
|
|
if (0) \
|
|
dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
|
|
})
|
|
#endif
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
#define dev_level_once(dev_level, dev, fmt, ...) \
|
|
do { \
|
|
static bool __print_once __read_mostly; \
|
|
\
|
|
if (!__print_once) { \
|
|
__print_once = true; \
|
|
dev_level(dev, fmt, ##__VA_ARGS__); \
|
|
} \
|
|
} while (0)
|
|
#else
|
|
#define dev_level_once(dev_level, dev, fmt, ...) \
|
|
do { \
|
|
if (0) \
|
|
dev_level(dev, fmt, ##__VA_ARGS__); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#define dev_emerg_once(dev, fmt, ...) \
|
|
dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_alert_once(dev, fmt, ...) \
|
|
dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_crit_once(dev, fmt, ...) \
|
|
dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_err_once(dev, fmt, ...) \
|
|
dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_warn_once(dev, fmt, ...) \
|
|
dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_notice_once(dev, fmt, ...) \
|
|
dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_info_once(dev, fmt, ...) \
|
|
dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_dbg_once(dev, fmt, ...) \
|
|
dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
|
|
|
|
#define dev_level_ratelimited(dev_level, dev, fmt, ...) \
|
|
do { \
|
|
static DEFINE_RATELIMIT_STATE(_rs, \
|
|
DEFAULT_RATELIMIT_INTERVAL, \
|
|
DEFAULT_RATELIMIT_BURST); \
|
|
if (__ratelimit(&_rs)) \
|
|
dev_level(dev, fmt, ##__VA_ARGS__); \
|
|
} while (0)
|
|
|
|
#define dev_emerg_ratelimited(dev, fmt, ...) \
|
|
dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_alert_ratelimited(dev, fmt, ...) \
|
|
dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_crit_ratelimited(dev, fmt, ...) \
|
|
dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_err_ratelimited(dev, fmt, ...) \
|
|
dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_warn_ratelimited(dev, fmt, ...) \
|
|
dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_notice_ratelimited(dev, fmt, ...) \
|
|
dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
|
|
#define dev_info_ratelimited(dev, fmt, ...) \
|
|
dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
|
|
#if defined(CONFIG_DYNAMIC_DEBUG)
|
|
/* descriptor check is first to prevent flooding with "callbacks suppressed" */
|
|
#define dev_dbg_ratelimited(dev, fmt, ...) \
|
|
do { \
|
|
static DEFINE_RATELIMIT_STATE(_rs, \
|
|
DEFAULT_RATELIMIT_INTERVAL, \
|
|
DEFAULT_RATELIMIT_BURST); \
|
|
DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
|
|
if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
|
|
__ratelimit(&_rs)) \
|
|
__dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt), \
|
|
##__VA_ARGS__); \
|
|
} while (0)
|
|
#elif defined(DEBUG)
|
|
#define dev_dbg_ratelimited(dev, fmt, ...) \
|
|
do { \
|
|
static DEFINE_RATELIMIT_STATE(_rs, \
|
|
DEFAULT_RATELIMIT_INTERVAL, \
|
|
DEFAULT_RATELIMIT_BURST); \
|
|
if (__ratelimit(&_rs)) \
|
|
dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
|
|
} while (0)
|
|
#else
|
|
#define dev_dbg_ratelimited(dev, fmt, ...) \
|
|
do { \
|
|
if (0) \
|
|
dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifdef VERBOSE_DEBUG
|
|
#define dev_vdbg dev_dbg
|
|
#else
|
|
#define dev_vdbg(dev, fmt, ...) \
|
|
({ \
|
|
if (0) \
|
|
dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
|
|
})
|
|
#endif
|
|
|
|
/*
|
|
* dev_WARN*() acts like dev_printk(), but with the key difference of
|
|
* using WARN/WARN_ONCE to include file/line information and a backtrace.
|
|
*/
|
|
#define dev_WARN(dev, format, arg...) \
|
|
WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
|
|
|
|
#define dev_WARN_ONCE(dev, condition, format, arg...) \
|
|
WARN_ONCE(condition, "%s %s: " format, \
|
|
dev_driver_string(dev), dev_name(dev), ## arg)
|
|
|
|
/* Create alias, so I can be autoloaded. */
|
|
#define MODULE_ALIAS_CHARDEV(major,minor) \
|
|
MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
|
|
#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
|
|
MODULE_ALIAS("char-major-" __stringify(major) "-*")
|
|
|
|
#ifdef CONFIG_SYSFS_DEPRECATED
|
|
extern long sysfs_deprecated;
|
|
#else
|
|
#define sysfs_deprecated 0
|
|
#endif
|
|
|
|
/**
|
|
* module_driver() - Helper macro for drivers that don't do anything
|
|
* special in module init/exit. This eliminates a lot of boilerplate.
|
|
* Each module may only use this macro once, and calling it replaces
|
|
* module_init() and module_exit().
|
|
*
|
|
* @__driver: driver name
|
|
* @__register: register function for this driver type
|
|
* @__unregister: unregister function for this driver type
|
|
* @...: Additional arguments to be passed to __register and __unregister.
|
|
*
|
|
* Use this macro to construct bus specific macros for registering
|
|
* drivers, and do not use it on its own.
|
|
*/
|
|
#define module_driver(__driver, __register, __unregister, ...) \
|
|
static int __init __driver##_init(void) \
|
|
{ \
|
|
return __register(&(__driver) , ##__VA_ARGS__); \
|
|
} \
|
|
module_init(__driver##_init); \
|
|
static void __exit __driver##_exit(void) \
|
|
{ \
|
|
__unregister(&(__driver) , ##__VA_ARGS__); \
|
|
} \
|
|
module_exit(__driver##_exit);
|
|
|
|
/**
|
|
* builtin_driver() - Helper macro for drivers that don't do anything
|
|
* special in init and have no exit. This eliminates some boilerplate.
|
|
* Each driver may only use this macro once, and calling it replaces
|
|
* device_initcall (or in some cases, the legacy __initcall). This is
|
|
* meant to be a direct parallel of module_driver() above but without
|
|
* the __exit stuff that is not used for builtin cases.
|
|
*
|
|
* @__driver: driver name
|
|
* @__register: register function for this driver type
|
|
* @...: Additional arguments to be passed to __register
|
|
*
|
|
* Use this macro to construct bus specific macros for registering
|
|
* drivers, and do not use it on its own.
|
|
*/
|
|
#define builtin_driver(__driver, __register, ...) \
|
|
static int __init __driver##_init(void) \
|
|
{ \
|
|
return __register(&(__driver) , ##__VA_ARGS__); \
|
|
} \
|
|
device_initcall(__driver##_init);
|
|
|
|
#endif /* _DEVICE_H_ */
|