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![Saravana Kannan](/assets/img/avatar_default.png)
The driver core/bus adding supplier-consumer dependencies by default enables functional dependencies to be tracked correctly even when the consumer devices haven't had their drivers registered or loaded (if they are modules). However, when the bus incorrectly adds dependencies that it shouldn't have added, the devices might never probe. For example, if device-C is a consumer of device-S and they have phandles to each other in DT, the following could happen: 1. Device-S get added first. 2. The bus add_links() callback will (incorrectly) try to link it as a consumer of device-C. 3. Since device-C isn't present, device-S will be put in "waiting-for-supplier" list. 4. Device-C gets added next. 5. All devices in "waiting-for-supplier" list are retried for linking. 6. Device-S gets linked as consumer to Device-C. 7. The bus add_links() callback will (correctly) try to link it as a consumer of device-S. 8. This isn't allowed because it would create a cyclic device links. Neither devices will get probed since the supplier is marked as dependent on the consumer. And the consumer will never probe because the consumer can't get resources from the supplier. Without this patch, things stay in this broken state. However, with this patch, the execution will continue like this: 9. Device-C's driver is loaded. 10. Device-C's driver removes Device-S as a consumer of Device-C. 11. Device-C's driver adds Device-C as a consumer of Device-S. 12. Device-S probes. 14. Device-C probes. kbuild test robot reported missing documentation for device.has_edit_links Reported-by: kbuild test robot <lkp@intel.com> Signed-off-by: Saravana Kannan <saravanak@google.com> Link: https://lore.kernel.org/r/20190731221721.187713-3-saravanak@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1953 lines
66 KiB
C
1953 lines
66 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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* @add_links: Called, perhaps multiple times per device, after a device is
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* added to this bus. The function is expected to create device
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* links to all the suppliers of the input device that are
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* available at the time this function is called. As in, the
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* function should NOT stop at the first failed device link if
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* other unlinked supplier devices are present in the system.
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*
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* Return 0 if device links have been successfully created to all
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* the suppliers of this device. Return an error if some of the
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* suppliers are not yet available and this function needs to be
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* reattempted in the future.
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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 (*add_links)(struct device *dev);
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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_name(struct device *dev, const void *name);
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int device_match_of_node(struct device *dev, const void *np);
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int device_match_fwnode(struct device *dev, const void *fwnode);
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int device_match_devt(struct device *dev, const void *pdevt);
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int device_match_acpi_dev(struct device *dev, const void *adev);
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int device_match_any(struct device *dev, const void *unused);
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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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/**
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* bus_find_device_by_name - device iterator for locating a particular device
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* of a specific name.
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* @bus: bus type
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* @start: Device to begin with
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* @name: name of the device to match
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*/
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static inline 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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{
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return bus_find_device(bus, start, name, device_match_name);
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}
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/**
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* bus_find_device_by_of_node : device iterator for locating a particular device
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* matching the of_node.
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* @bus: bus type
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* @np: of_node of the device to match.
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*/
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static inline struct device *
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bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
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{
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return bus_find_device(bus, NULL, np, device_match_of_node);
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}
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/**
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* bus_find_device_by_fwnode : device iterator for locating a particular device
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* matching the fwnode.
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* @bus: bus type
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* @fwnode: fwnode of the device to match.
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*/
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static inline struct device *
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bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
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{
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return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
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}
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/**
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* bus_find_device_by_devt : device iterator for locating a particular device
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* matching the device type.
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* @bus: bus type
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* @devt: device type of the device to match.
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*/
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static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
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dev_t devt)
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{
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return bus_find_device(bus, NULL, &devt, device_match_devt);
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}
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/**
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* bus_find_next_device - Find the next device after a given device in a
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* given bus.
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* @bus: bus type
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* @cur: device to begin the search with.
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*/
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static inline struct device *
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bus_find_next_device(struct bus_type *bus,struct device *cur)
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{
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return bus_find_device(bus, cur, NULL, device_match_any);
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}
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#ifdef CONFIG_ACPI
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struct acpi_device;
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/**
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* bus_find_device_by_acpi_dev : device iterator for locating a particular device
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* matching the ACPI COMPANION device.
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* @bus: bus type
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* @adev: ACPI COMPANION device to match.
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*/
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static inline struct device *
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bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev)
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{
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return bus_find_device(bus, NULL, adev, device_match_acpi_dev);
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}
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#else
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static inline struct device *
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bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev)
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{
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return NULL;
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}
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#endif
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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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* @edit_links: Called to allow a matched driver to edit the device links the
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* bus might have added incorrectly. This will be useful to handle
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* cases where the bus incorrectly adds functional dependencies
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* that aren't true or tries to create cyclic dependencies. But
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* doesn't correctly handle functional dependencies that are
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* missed by the bus as the supplier's sync_state might get to
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* execute before the driver for a missing consumer is loaded and
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* gets to edit the device links for the consumer.
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*
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* This function might be called multiple times after a new device
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* is added. The function is expected to create all the device
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* links for the new device and return 0 if it was completed
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* successfully or return an error if it needs to be reattempted
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* in the future.
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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 (*edit_links)(struct device *dev);
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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) \
|
|
struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
|
|
#define DRIVER_ATTR_RO(_name) \
|
|
struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
|
|
#define DRIVER_ATTR_WO(_name) \
|
|
struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
|
|
|
|
extern int __must_check driver_create_file(struct device_driver *driver,
|
|
const struct driver_attribute *attr);
|
|
extern void driver_remove_file(struct device_driver *driver,
|
|
const struct driver_attribute *attr);
|
|
|
|
extern int __must_check driver_for_each_device(struct device_driver *drv,
|
|
struct device *start,
|
|
void *data,
|
|
int (*fn)(struct device *dev,
|
|
void *));
|
|
struct device *driver_find_device(struct device_driver *drv,
|
|
struct device *start, const void *data,
|
|
int (*match)(struct device *dev, const void *data));
|
|
|
|
/**
|
|
* driver_find_device_by_name - device iterator for locating a particular device
|
|
* of a specific name.
|
|
* @driver: the driver we're iterating
|
|
* @name: name of the device to match
|
|
*/
|
|
static inline struct device *driver_find_device_by_name(struct device_driver *drv,
|
|
const char *name)
|
|
{
|
|
return driver_find_device(drv, NULL, name, device_match_name);
|
|
}
|
|
|
|
/**
|
|
* driver_find_device_by_of_node- device iterator for locating a particular device
|
|
* by of_node pointer.
|
|
* @driver: the driver we're iterating
|
|
* @np: of_node pointer to match.
|
|
*/
|
|
static inline struct device *
|
|
driver_find_device_by_of_node(struct device_driver *drv,
|
|
const struct device_node *np)
|
|
{
|
|
return driver_find_device(drv, NULL, np, device_match_of_node);
|
|
}
|
|
|
|
/**
|
|
* driver_find_device_by_fwnode- device iterator for locating a particular device
|
|
* by fwnode pointer.
|
|
* @driver: the driver we're iterating
|
|
* @fwnode: fwnode pointer to match.
|
|
*/
|
|
static inline struct device *
|
|
driver_find_device_by_fwnode(struct device_driver *drv,
|
|
const struct fwnode_handle *fwnode)
|
|
{
|
|
return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
|
|
}
|
|
|
|
/**
|
|
* driver_find_device_by_devt- device iterator for locating a particular device
|
|
* by devt.
|
|
* @drv: the driver we're iterating
|
|
* @devt: devt pointer to match.
|
|
*/
|
|
static inline struct device *driver_find_device_by_devt(struct device_driver *drv,
|
|
dev_t devt)
|
|
{
|
|
return driver_find_device(drv, NULL, &devt, device_match_devt);
|
|
}
|
|
|
|
static inline struct device *driver_find_next_device(struct device_driver *drv,
|
|
struct device *start)
|
|
{
|
|
return driver_find_device(drv, start, NULL, device_match_any);
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
/**
|
|
* driver_find_device_by_acpi_dev : device iterator for locating a particular
|
|
* device matching the ACPI_COMPANION device.
|
|
* @driver: the driver we're iterating
|
|
* @adev: ACPI_COMPANION device to match.
|
|
*/
|
|
static inline struct device *
|
|
driver_find_device_by_acpi_dev(struct device_driver *drv,
|
|
const struct acpi_device *adev)
|
|
{
|
|
return driver_find_device(drv, NULL, adev, device_match_acpi_dev);
|
|
}
|
|
#else
|
|
static inline struct device *
|
|
driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
void driver_deferred_probe_add(struct device *dev);
|
|
int driver_deferred_probe_check_state(struct device *dev);
|
|
int driver_deferred_probe_check_state_continue(struct device *dev);
|
|
|
|
/**
|
|
* struct subsys_interface - interfaces to device functions
|
|
* @name: name of the device function
|
|
* @subsys: subsytem of the devices to attach to
|
|
* @node: the list of functions registered at the subsystem
|
|
* @add_dev: device hookup to device function handler
|
|
* @remove_dev: device hookup to device function handler
|
|
*
|
|
* Simple interfaces attached to a subsystem. Multiple interfaces can
|
|
* attach to a subsystem and its devices. Unlike drivers, they do not
|
|
* exclusively claim or control devices. Interfaces usually represent
|
|
* a specific functionality of a subsystem/class of devices.
|
|
*/
|
|
struct subsys_interface {
|
|
const char *name;
|
|
struct bus_type *subsys;
|
|
struct list_head node;
|
|
int (*add_dev)(struct device *dev, struct subsys_interface *sif);
|
|
void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
|
|
};
|
|
|
|
int subsys_interface_register(struct subsys_interface *sif);
|
|
void subsys_interface_unregister(struct subsys_interface *sif);
|
|
|
|
int subsys_system_register(struct bus_type *subsys,
|
|
const struct attribute_group **groups);
|
|
int subsys_virtual_register(struct bus_type *subsys,
|
|
const struct attribute_group **groups);
|
|
|
|
/**
|
|
* struct class - device classes
|
|
* @name: Name of the class.
|
|
* @owner: The module owner.
|
|
* @class_groups: Default attributes of this class.
|
|
* @dev_groups: Default attributes of the devices that belong to the class.
|
|
* @dev_kobj: The kobject that represents this class and links it into the hierarchy.
|
|
* @dev_uevent: Called when a device is added, removed from this class, or a
|
|
* few other things that generate uevents to add the environment
|
|
* variables.
|
|
* @devnode: Callback to provide the devtmpfs.
|
|
* @class_release: Called to release this class.
|
|
* @dev_release: Called to release the device.
|
|
* @shutdown_pre: Called at shut-down time before driver shutdown.
|
|
* @ns_type: Callbacks so sysfs can detemine namespaces.
|
|
* @namespace: Namespace of the device belongs to this class.
|
|
* @get_ownership: Allows class to specify uid/gid of the sysfs directories
|
|
* for the devices belonging to the class. Usually tied to
|
|
* device's namespace.
|
|
* @pm: The default device power management operations of this class.
|
|
* @p: The private data of the driver core, no one other than the
|
|
* driver core can touch this.
|
|
*
|
|
* A class is a higher-level view of a device that abstracts out low-level
|
|
* implementation details. Drivers may see a SCSI disk or an ATA disk, but,
|
|
* at the class level, they are all simply disks. Classes allow user space
|
|
* to work with devices based on what they do, rather than how they are
|
|
* connected or how they work.
|
|
*/
|
|
struct class {
|
|
const char *name;
|
|
struct module *owner;
|
|
|
|
const struct attribute_group **class_groups;
|
|
const struct attribute_group **dev_groups;
|
|
struct kobject *dev_kobj;
|
|
|
|
int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
|
|
char *(*devnode)(struct device *dev, umode_t *mode);
|
|
|
|
void (*class_release)(struct class *class);
|
|
void (*dev_release)(struct device *dev);
|
|
|
|
int (*shutdown_pre)(struct device *dev);
|
|
|
|
const struct kobj_ns_type_operations *ns_type;
|
|
const void *(*namespace)(struct device *dev);
|
|
|
|
void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid);
|
|
|
|
const struct dev_pm_ops *pm;
|
|
|
|
struct subsys_private *p;
|
|
};
|
|
|
|
struct class_dev_iter {
|
|
struct klist_iter ki;
|
|
const struct device_type *type;
|
|
};
|
|
|
|
extern struct kobject *sysfs_dev_block_kobj;
|
|
extern struct kobject *sysfs_dev_char_kobj;
|
|
extern int __must_check __class_register(struct class *class,
|
|
struct lock_class_key *key);
|
|
extern void class_unregister(struct class *class);
|
|
|
|
/* This is a #define to keep the compiler from merging different
|
|
* instances of the __key variable */
|
|
#define class_register(class) \
|
|
({ \
|
|
static struct lock_class_key __key; \
|
|
__class_register(class, &__key); \
|
|
})
|
|
|
|
struct class_compat;
|
|
struct class_compat *class_compat_register(const char *name);
|
|
void class_compat_unregister(struct class_compat *cls);
|
|
int class_compat_create_link(struct class_compat *cls, struct device *dev,
|
|
struct device *device_link);
|
|
void class_compat_remove_link(struct class_compat *cls, struct device *dev,
|
|
struct device *device_link);
|
|
|
|
extern void class_dev_iter_init(struct class_dev_iter *iter,
|
|
struct class *class,
|
|
struct device *start,
|
|
const struct device_type *type);
|
|
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 *));
|
|
|
|
/**
|
|
* class_find_device_by_name - device iterator for locating a particular device
|
|
* of a specific name.
|
|
* @class: class type
|
|
* @name: name of the device to match
|
|
*/
|
|
static inline struct device *class_find_device_by_name(struct class *class,
|
|
const char *name)
|
|
{
|
|
return class_find_device(class, NULL, name, device_match_name);
|
|
}
|
|
|
|
/**
|
|
* class_find_device_by_of_node : device iterator for locating a particular device
|
|
* matching the of_node.
|
|
* @class: class type
|
|
* @np: of_node of the device to match.
|
|
*/
|
|
static inline struct device *
|
|
class_find_device_by_of_node(struct class *class, const struct device_node *np)
|
|
{
|
|
return class_find_device(class, NULL, np, device_match_of_node);
|
|
}
|
|
|
|
/**
|
|
* class_find_device_by_fwnode : device iterator for locating a particular device
|
|
* matching the fwnode.
|
|
* @class: class type
|
|
* @fwnode: fwnode of the device to match.
|
|
*/
|
|
static inline struct device *
|
|
class_find_device_by_fwnode(struct class *class,
|
|
const struct fwnode_handle *fwnode)
|
|
{
|
|
return class_find_device(class, NULL, fwnode, device_match_fwnode);
|
|
}
|
|
|
|
/**
|
|
* class_find_device_by_devt : device iterator for locating a particular device
|
|
* matching the device type.
|
|
* @class: class type
|
|
* @devt: device type of the device to match.
|
|
*/
|
|
static inline struct device *class_find_device_by_devt(struct class *class,
|
|
dev_t devt)
|
|
{
|
|
return class_find_device(class, NULL, &devt, device_match_devt);
|
|
}
|
|
|
|
#ifdef CONFIG_ACPI
|
|
struct acpi_device;
|
|
/**
|
|
* class_find_device_by_acpi_dev : device iterator for locating a particular
|
|
* device matching the ACPI_COMPANION device.
|
|
* @class: class type
|
|
* @adev: ACPI_COMPANION device to match.
|
|
*/
|
|
static inline struct device *
|
|
class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev)
|
|
{
|
|
return class_find_device(class, NULL, adev, device_match_acpi_dev);
|
|
}
|
|
#else
|
|
static inline struct device *
|
|
class_find_device_by_acpi_dev(struct class *class, const void *adev)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
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 will not remove this link automatically.
|
|
* 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.
|
|
* MANAGED: The core tracks presence of supplier/consumer drivers (internal).
|
|
*/
|
|
#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)
|
|
#define DL_FLAG_MANAGED BIT(6)
|
|
|
|
/**
|
|
* 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.
|
|
* @needs_suppliers: Hook to global list of devices waiting for suppliers.
|
|
* @status: Driver status information.
|
|
*/
|
|
struct dev_links_info {
|
|
struct list_head suppliers;
|
|
struct list_head consumers;
|
|
struct list_head needs_suppliers;
|
|
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.
|
|
* @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.
|
|
* @has_edit_links: This device has a driver than is capable of
|
|
* editing the device links created by driver core.
|
|
* @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 */
|
|
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;
|
|
bool has_edit_links: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 int driver_edit_links(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);
|
|
|
|
#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);
|
|
void device_link_remove_from_wfs(struct device *consumer);
|
|
|
|
#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_ */
|