293 lines
10 KiB
C
293 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* The driver-specific portions of the 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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* Copyright (c) 2012-2019 Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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* Copyright (c) 2012-2019 Linux Foundation
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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_DRIVER_H_
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#define _DEVICE_DRIVER_H_
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#include <linux/kobject.h>
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#include <linux/klist.h>
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#include <linux/pm.h>
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#include <linux/device/bus.h>
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/**
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* enum probe_type - device driver probe type to try
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* Device drivers may opt in for special handling of their
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* respective probe routines. This tells the core what to
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* expect and prefer.
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*
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* @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
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* whether probed synchronously or asynchronously.
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* @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
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* probing order is not essential for booting the system may
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* opt into executing their probes asynchronously.
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* @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
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* their probe routines to run synchronously with driver and
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* device registration (with the exception of -EPROBE_DEFER
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* handling - re-probing always ends up being done asynchronously).
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*
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* Note that the end goal is to switch the kernel to use asynchronous
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* probing by default, so annotating drivers with
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* %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
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* to speed up boot process while we are validating the rest of the
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* drivers.
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*/
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enum probe_type {
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PROBE_DEFAULT_STRATEGY,
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PROBE_PREFER_ASYNCHRONOUS,
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PROBE_FORCE_SYNCHRONOUS,
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};
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/**
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* struct device_driver - The basic device driver structure
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* @name: Name of the device driver.
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* @bus: The bus which the device of this driver belongs to.
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* @owner: The module owner.
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* @mod_name: Used for built-in modules.
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* @suppress_bind_attrs: Disables bind/unbind via sysfs.
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* @probe_type: Type of the probe (synchronous or asynchronous) to use.
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* @of_match_table: The open firmware table.
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* @acpi_match_table: The ACPI match table.
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* @probe: Called to query the existence of a specific device,
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* whether this driver can work with it, and bind the driver
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* to a specific device.
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* @sync_state: Called to sync device state to software state after all the
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* state tracking consumers linked to this device (present at
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* the time of late_initcall) have successfully bound to a
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* driver. If the device has no consumers, this function will
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* be called at late_initcall_sync level. If the device has
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* consumers that are never bound to a driver, this function
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* will never get called until they do.
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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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* @dev_groups: Additional attributes attached to device instance once
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* it is bound to the driver.
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* @pm: Power management operations of the device which matched
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* this driver.
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* @coredump: Called when sysfs entry is written to. The device driver
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* is expected to call the dev_coredump API resulting in a
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* uevent.
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* @p: Driver core's private data, no one other than the driver
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* core can touch this.
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*
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* The device driver-model tracks all of the drivers known to the system.
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* The main reason for this tracking is to enable the driver core to match
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* up drivers with new devices. Once drivers are known objects within the
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* system, however, a number of other things become possible. Device drivers
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* can export information and configuration variables that are independent
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* of any specific device.
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*/
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struct device_driver {
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const char *name;
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struct bus_type *bus;
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struct module *owner;
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const char *mod_name; /* used for built-in modules */
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bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
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enum probe_type probe_type;
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const struct of_device_id *of_match_table;
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const struct acpi_device_id *acpi_match_table;
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int (*probe) (struct device *dev);
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void (*sync_state)(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 attribute_group **dev_groups;
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const struct dev_pm_ops *pm;
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void (*coredump) (struct device *dev);
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struct driver_private *p;
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};
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extern int __must_check driver_register(struct device_driver *drv);
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extern void driver_unregister(struct device_driver *drv);
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extern struct device_driver *driver_find(const char *name,
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struct bus_type *bus);
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extern int driver_probe_done(void);
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extern void wait_for_device_probe(void);
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/* sysfs interface for exporting driver attributes */
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struct driver_attribute {
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struct attribute attr;
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ssize_t (*show)(struct device_driver *driver, char *buf);
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ssize_t (*store)(struct device_driver *driver, const char *buf,
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size_t count);
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};
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#define DRIVER_ATTR_RW(_name) \
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struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
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#define DRIVER_ATTR_RO(_name) \
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struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
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#define DRIVER_ATTR_WO(_name) \
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struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
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extern int __must_check driver_create_file(struct device_driver *driver,
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const struct driver_attribute *attr);
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extern void driver_remove_file(struct device_driver *driver,
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const struct driver_attribute *attr);
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extern int __must_check driver_for_each_device(struct device_driver *drv,
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struct device *start,
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void *data,
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int (*fn)(struct device *dev,
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void *));
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struct device *driver_find_device(struct device_driver *drv,
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struct device *start, const void *data,
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int (*match)(struct device *dev, const void *data));
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/**
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* driver_find_device_by_name - device iterator for locating a particular device
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* of a specific name.
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* @drv: the driver we're iterating
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* @name: name of the device to match
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*/
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static inline struct device *driver_find_device_by_name(struct device_driver *drv,
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const char *name)
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{
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return driver_find_device(drv, NULL, name, device_match_name);
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}
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/**
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* driver_find_device_by_of_node- device iterator for locating a particular device
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* by of_node pointer.
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* @drv: the driver we're iterating
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* @np: of_node pointer to match.
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*/
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static inline struct device *
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driver_find_device_by_of_node(struct device_driver *drv,
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const struct device_node *np)
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{
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return driver_find_device(drv, NULL, np, device_match_of_node);
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}
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/**
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* driver_find_device_by_fwnode- device iterator for locating a particular device
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* by fwnode pointer.
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* @drv: the driver we're iterating
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* @fwnode: fwnode pointer to match.
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*/
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static inline struct device *
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driver_find_device_by_fwnode(struct device_driver *drv,
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const struct fwnode_handle *fwnode)
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{
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return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
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}
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/**
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* driver_find_device_by_devt- device iterator for locating a particular device
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* by devt.
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* @drv: the driver we're iterating
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* @devt: devt pointer to match.
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*/
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static inline struct device *driver_find_device_by_devt(struct device_driver *drv,
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dev_t devt)
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{
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return driver_find_device(drv, NULL, &devt, device_match_devt);
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}
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static inline struct device *driver_find_next_device(struct device_driver *drv,
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struct device *start)
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{
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return driver_find_device(drv, start, NULL, device_match_any);
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}
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#ifdef CONFIG_ACPI
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/**
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* driver_find_device_by_acpi_dev : device iterator for locating a particular
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* device matching the ACPI_COMPANION device.
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* @drv: the driver we're iterating
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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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driver_find_device_by_acpi_dev(struct device_driver *drv,
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const struct acpi_device *adev)
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{
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return driver_find_device(drv, 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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driver_find_device_by_acpi_dev(struct device_driver *drv, 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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extern int driver_deferred_probe_timeout;
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void driver_deferred_probe_add(struct device *dev);
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int driver_deferred_probe_check_state(struct device *dev);
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void driver_init(void);
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/**
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* module_driver() - Helper macro for drivers that don't do anything
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* special in module init/exit. This eliminates a lot of boilerplate.
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* Each module may only use this macro once, and calling it replaces
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* module_init() and module_exit().
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*
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* @__driver: driver name
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* @__register: register function for this driver type
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* @__unregister: unregister function for this driver type
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* @...: Additional arguments to be passed to __register and __unregister.
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*
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* Use this macro to construct bus specific macros for registering
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* drivers, and do not use it on its own.
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*/
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#define module_driver(__driver, __register, __unregister, ...) \
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static int __init __driver##_init(void) \
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{ \
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return __register(&(__driver) , ##__VA_ARGS__); \
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} \
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module_init(__driver##_init); \
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static void __exit __driver##_exit(void) \
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{ \
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__unregister(&(__driver) , ##__VA_ARGS__); \
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} \
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module_exit(__driver##_exit);
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/**
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* builtin_driver() - Helper macro for drivers that don't do anything
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* special in init and have no exit. This eliminates some boilerplate.
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* Each driver may only use this macro once, and calling it replaces
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* device_initcall (or in some cases, the legacy __initcall). This is
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* meant to be a direct parallel of module_driver() above but without
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* the __exit stuff that is not used for builtin cases.
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*
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* @__driver: driver name
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* @__register: register function for this driver type
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* @...: Additional arguments to be passed to __register
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*
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* Use this macro to construct bus specific macros for registering
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* drivers, and do not use it on its own.
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*/
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#define builtin_driver(__driver, __register, ...) \
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static int __init __driver##_init(void) \
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{ \
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return __register(&(__driver) , ##__VA_ARGS__); \
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} \
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device_initcall(__driver##_init);
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#endif /* _DEVICE_DRIVER_H_ */
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