564b905ab1
The naming convention used by commit 7538e3db6e015e890825fbd9f86599b (PM: Add support for device power domains), which introduced the struct dev_power_domain type for representing device power domains, evidently confuses some developers who tend to think that objects of this type must correspond to "power domains" as defined by hardware, which is not the case. Namely, at the kernel level, a struct dev_power_domain object can represent arbitrary set of devices that are mutually dependent power management-wise and need not belong to one hardware power domain. To avoid that confusion, rename struct dev_power_domain to struct dev_pm_domain and rename the related pointers in struct device and struct pm_clk_notifier_block from pwr_domain to pm_domain. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Kevin Hilman <khilman@ti.com>
907 lines
32 KiB
C
907 lines
32 KiB
C
/*
|
|
* device.h - generic, centralized driver model
|
|
*
|
|
* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
|
|
* Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
|
|
* Copyright (c) 2008-2009 Novell Inc.
|
|
*
|
|
* This file is released under the GPLv2
|
|
*
|
|
* See Documentation/driver-model/ for more information.
|
|
*/
|
|
|
|
#ifndef _DEVICE_H_
|
|
#define _DEVICE_H_
|
|
|
|
#include <linux/ioport.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/klist.h>
|
|
#include <linux/list.h>
|
|
#include <linux/lockdep.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/types.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pm.h>
|
|
#include <asm/atomic.h>
|
|
#include <asm/device.h>
|
|
|
|
struct device;
|
|
struct device_private;
|
|
struct device_driver;
|
|
struct driver_private;
|
|
struct class;
|
|
struct subsys_private;
|
|
struct bus_type;
|
|
struct device_node;
|
|
|
|
struct bus_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct bus_type *bus, char *buf);
|
|
ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
|
|
};
|
|
|
|
#define BUS_ATTR(_name, _mode, _show, _store) \
|
|
struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
|
|
|
|
extern int __must_check bus_create_file(struct bus_type *,
|
|
struct bus_attribute *);
|
|
extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
|
|
|
|
/**
|
|
* struct bus_type - The bus type of the device
|
|
*
|
|
* @name: The name of the bus.
|
|
* @bus_attrs: Default attributes of the bus.
|
|
* @dev_attrs: Default attributes of the devices on the bus.
|
|
* @drv_attrs: Default attributes of the device drivers on the bus.
|
|
* @match: Called, perhaps multiple times, whenever a new device or driver
|
|
* is added for this bus. It should return a nonzero value if the
|
|
* given device can be handled by the given driver.
|
|
* @uevent: Called when a device is added, removed, or a few other things
|
|
* that generate uevents to add the environment variables.
|
|
* @probe: Called when a new device or driver add to this bus, and callback
|
|
* the specific driver's probe to initial the matched device.
|
|
* @remove: Called when a device removed from this bus.
|
|
* @shutdown: Called at shut-down time to quiesce the device.
|
|
* @suspend: Called when a device on this bus wants to go to sleep mode.
|
|
* @resume: Called to bring a device on this bus out of sleep mode.
|
|
* @pm: Power management operations of this bus, callback the specific
|
|
* device driver's pm-ops.
|
|
* @p: The private data of the driver core, only the driver core can
|
|
* touch this.
|
|
*
|
|
* A bus is a channel between the processor and one or more devices. For the
|
|
* purposes of the device model, all devices are connected via a bus, even if
|
|
* it is an internal, virtual, "platform" bus. Buses can plug into each other.
|
|
* A USB controller is usually a PCI device, for example. The device model
|
|
* represents the actual connections between buses and the devices they control.
|
|
* A bus is represented by the bus_type structure. It contains the name, the
|
|
* default attributes, the bus' methods, PM operations, and the driver core's
|
|
* private data.
|
|
*/
|
|
struct bus_type {
|
|
const char *name;
|
|
struct bus_attribute *bus_attrs;
|
|
struct device_attribute *dev_attrs;
|
|
struct driver_attribute *drv_attrs;
|
|
|
|
int (*match)(struct device *dev, struct device_driver *drv);
|
|
int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
|
|
int (*probe)(struct device *dev);
|
|
int (*remove)(struct device *dev);
|
|
void (*shutdown)(struct device *dev);
|
|
|
|
int (*suspend)(struct device *dev, pm_message_t state);
|
|
int (*resume)(struct device *dev);
|
|
|
|
const struct dev_pm_ops *pm;
|
|
|
|
struct subsys_private *p;
|
|
};
|
|
|
|
extern int __must_check bus_register(struct bus_type *bus);
|
|
extern void bus_unregister(struct bus_type *bus);
|
|
|
|
extern int __must_check bus_rescan_devices(struct bus_type *bus);
|
|
|
|
/* iterator helpers for buses */
|
|
|
|
int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
|
|
int (*fn)(struct device *dev, void *data));
|
|
struct device *bus_find_device(struct bus_type *bus, struct device *start,
|
|
void *data,
|
|
int (*match)(struct device *dev, void *data));
|
|
struct device *bus_find_device_by_name(struct bus_type *bus,
|
|
struct device *start,
|
|
const char *name);
|
|
|
|
int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
|
|
void *data, int (*fn)(struct device_driver *, void *));
|
|
|
|
void bus_sort_breadthfirst(struct bus_type *bus,
|
|
int (*compare)(const struct device *a,
|
|
const struct device *b));
|
|
/*
|
|
* Bus notifiers: Get notified of addition/removal of devices
|
|
* and binding/unbinding of drivers to devices.
|
|
* In the long run, it should be a replacement for the platform
|
|
* notify hooks.
|
|
*/
|
|
struct notifier_block;
|
|
|
|
extern int bus_register_notifier(struct bus_type *bus,
|
|
struct notifier_block *nb);
|
|
extern int bus_unregister_notifier(struct bus_type *bus,
|
|
struct notifier_block *nb);
|
|
|
|
/* All 4 notifers below get called with the target struct device *
|
|
* as an argument. Note that those functions are likely to be called
|
|
* with the device lock held in the core, so be careful.
|
|
*/
|
|
#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
|
|
#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
|
|
#define BUS_NOTIFY_BIND_DRIVER 0x00000003 /* driver about to be
|
|
bound */
|
|
#define BUS_NOTIFY_BOUND_DRIVER 0x00000004 /* driver bound to device */
|
|
#define BUS_NOTIFY_UNBIND_DRIVER 0x00000005 /* driver about to be
|
|
unbound */
|
|
#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000006 /* driver is unbound
|
|
from the device */
|
|
|
|
extern struct kset *bus_get_kset(struct bus_type *bus);
|
|
extern struct klist *bus_get_device_klist(struct bus_type *bus);
|
|
|
|
/**
|
|
* struct device_driver - The basic device driver structure
|
|
* @name: Name of the device driver.
|
|
* @bus: The bus which the device of this driver belongs to.
|
|
* @owner: The module owner.
|
|
* @mod_name: Used for built-in modules.
|
|
* @suppress_bind_attrs: Disables bind/unbind via sysfs.
|
|
* @of_match_table: The open firmware table.
|
|
* @probe: Called to query the existence of a specific device,
|
|
* whether this driver can work with it, and bind the driver
|
|
* to a specific device.
|
|
* @remove: Called when the device is removed from the system to
|
|
* unbind a device from this driver.
|
|
* @shutdown: Called at shut-down time to quiesce the device.
|
|
* @suspend: Called to put the device to sleep mode. Usually to a
|
|
* low power state.
|
|
* @resume: Called to bring a device from sleep mode.
|
|
* @groups: Default attributes that get created by the driver core
|
|
* automatically.
|
|
* @pm: Power management operations of the device which matched
|
|
* this driver.
|
|
* @p: Driver core's private data, no one other than the driver
|
|
* core can touch this.
|
|
*
|
|
* The device driver-model tracks all of the drivers known to the system.
|
|
* The main reason for this tracking is to enable the driver core to match
|
|
* up drivers with new devices. Once drivers are known objects within the
|
|
* system, however, a number of other things become possible. Device drivers
|
|
* can export information and configuration variables that are independent
|
|
* of any specific device.
|
|
*/
|
|
struct device_driver {
|
|
const char *name;
|
|
struct bus_type *bus;
|
|
|
|
struct module *owner;
|
|
const char *mod_name; /* used for built-in modules */
|
|
|
|
bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
|
|
|
|
const struct of_device_id *of_match_table;
|
|
|
|
int (*probe) (struct device *dev);
|
|
int (*remove) (struct device *dev);
|
|
void (*shutdown) (struct device *dev);
|
|
int (*suspend) (struct device *dev, pm_message_t state);
|
|
int (*resume) (struct device *dev);
|
|
const struct attribute_group **groups;
|
|
|
|
const struct dev_pm_ops *pm;
|
|
|
|
struct driver_private *p;
|
|
};
|
|
|
|
|
|
extern int __must_check driver_register(struct device_driver *drv);
|
|
extern void driver_unregister(struct device_driver *drv);
|
|
|
|
extern struct device_driver *get_driver(struct device_driver *drv);
|
|
extern void put_driver(struct device_driver *drv);
|
|
extern struct device_driver *driver_find(const char *name,
|
|
struct bus_type *bus);
|
|
extern int driver_probe_done(void);
|
|
extern void wait_for_device_probe(void);
|
|
|
|
|
|
/* sysfs interface for exporting driver attributes */
|
|
|
|
struct driver_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct device_driver *driver, char *buf);
|
|
ssize_t (*store)(struct device_driver *driver, const char *buf,
|
|
size_t count);
|
|
};
|
|
|
|
#define DRIVER_ATTR(_name, _mode, _show, _store) \
|
|
struct driver_attribute driver_attr_##_name = \
|
|
__ATTR(_name, _mode, _show, _store)
|
|
|
|
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_add_kobj(struct device_driver *drv,
|
|
struct kobject *kobj,
|
|
const char *fmt, ...);
|
|
|
|
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, void *data,
|
|
int (*match)(struct device *dev, void *data));
|
|
|
|
/**
|
|
* struct class - device classes
|
|
* @name: Name of the class.
|
|
* @owner: The module owner.
|
|
* @class_attrs: Default attributes of this class.
|
|
* @dev_attrs: Default attributes of the devices belong to the class.
|
|
* @dev_bin_attrs: Default binary attributes of the devices 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.
|
|
* @suspend: Used to put the device to sleep mode, usually to a low power
|
|
* state.
|
|
* @resume: Used to bring the device from the sleep mode.
|
|
* @ns_type: Callbacks so sysfs can detemine namespaces.
|
|
* @namespace: Namespace of the device belongs to this class.
|
|
* @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;
|
|
|
|
struct class_attribute *class_attrs;
|
|
struct device_attribute *dev_attrs;
|
|
struct bin_attribute *dev_bin_attrs;
|
|
struct kobject *dev_kobj;
|
|
|
|
int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
|
|
char *(*devnode)(struct device *dev, mode_t *mode);
|
|
|
|
void (*class_release)(struct class *class);
|
|
void (*dev_release)(struct device *dev);
|
|
|
|
int (*suspend)(struct device *dev, pm_message_t state);
|
|
int (*resume)(struct device *dev);
|
|
|
|
const struct kobj_ns_type_operations *ns_type;
|
|
const void *(*namespace)(struct device *dev);
|
|
|
|
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, void *data,
|
|
int (*match)(struct device *, void *));
|
|
|
|
struct class_attribute {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct class *class, struct class_attribute *attr,
|
|
char *buf);
|
|
ssize_t (*store)(struct class *class, struct class_attribute *attr,
|
|
const char *buf, size_t count);
|
|
};
|
|
|
|
#define CLASS_ATTR(_name, _mode, _show, _store) \
|
|
struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
|
|
|
|
extern int __must_check class_create_file(struct class *class,
|
|
const struct class_attribute *attr);
|
|
extern void class_remove_file(struct class *class,
|
|
const struct class_attribute *attr);
|
|
|
|
/* 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, mode_t *mode);
|
|
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);
|
|
};
|
|
|
|
#define DEVICE_ATTR(_name, _mode, _show, _store) \
|
|
struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
|
|
|
|
extern int __must_check 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 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);
|
|
extern int device_schedule_callback_owner(struct device *dev,
|
|
void (*func)(struct device *dev), struct module *owner);
|
|
|
|
/* This is a macro to avoid include problems with THIS_MODULE */
|
|
#define device_schedule_callback(dev, func) \
|
|
device_schedule_callback_owner(dev, func, THIS_MODULE)
|
|
|
|
/* 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(dr_release_t release, size_t size, gfp_t gfp,
|
|
const char *name);
|
|
#define devres_alloc(release, size, gfp) \
|
|
__devres_alloc(release, size, gfp, #release)
|
|
#else
|
|
extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
|
|
#endif
|
|
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);
|
|
|
|
/* 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 kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
|
|
extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
|
|
extern void devm_kfree(struct device *dev, void *p);
|
|
|
|
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 - 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.
|
|
* @power: For device power management.
|
|
* See Documentation/power/devices.txt 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.
|
|
* @numa_node: NUMA node this device is close to.
|
|
* @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.
|
|
* @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.
|
|
* @archdata: For arch-specific additions.
|
|
* @of_node: Associated device tree node.
|
|
* @devt: For creating the sysfs "dev".
|
|
* @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).
|
|
*
|
|
* 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 device *parent;
|
|
|
|
struct device_private *p;
|
|
|
|
struct kobject kobj;
|
|
const char *init_name; /* initial name of the device */
|
|
const struct device_type *type;
|
|
|
|
struct mutex mutex; /* mutex to synchronize calls to
|
|
* its driver.
|
|
*/
|
|
|
|
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 */
|
|
struct dev_pm_info power;
|
|
struct dev_pm_domain *pm_domain;
|
|
|
|
#ifdef CONFIG_NUMA
|
|
int numa_node; /* NUMA node this device is close to */
|
|
#endif
|
|
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. */
|
|
|
|
struct device_dma_parameters *dma_parms;
|
|
|
|
struct list_head dma_pools; /* dma pools (if dma'ble) */
|
|
|
|
struct dma_coherent_mem *dma_mem; /* internal for coherent mem
|
|
override */
|
|
/* arch specific additions */
|
|
struct dev_archdata archdata;
|
|
|
|
struct device_node *of_node; /* associated device tree node */
|
|
|
|
dev_t devt; /* dev_t, creates the sysfs "dev" */
|
|
|
|
spinlock_t devres_lock;
|
|
struct list_head devres_head;
|
|
|
|
struct klist_node knode_class;
|
|
struct class *class;
|
|
const struct attribute_group **groups; /* optional groups */
|
|
|
|
void (*release)(struct device *dev);
|
|
};
|
|
|
|
/* 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 int dev_set_name(struct device *dev, const char *name, ...)
|
|
__attribute__((format(printf, 2, 3)));
|
|
|
|
#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 -1;
|
|
}
|
|
static inline void set_dev_node(struct device *dev, int node)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
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 void device_lock(struct device *dev)
|
|
{
|
|
mutex_lock(&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);
|
|
}
|
|
|
|
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 struct device *device_find_child(struct device *dev, void *data,
|
|
int (*match)(struct device *dev, void *data));
|
|
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,
|
|
mode_t *mode, const char **tmp);
|
|
extern void *dev_get_drvdata(const struct device *dev);
|
|
extern int dev_set_drvdata(struct device *dev, void *data);
|
|
|
|
/*
|
|
* Root device objects for grouping under /sys/devices
|
|
*/
|
|
extern struct device *__root_device_register(const char *name,
|
|
struct module *owner);
|
|
static inline struct device *root_device_register(const char *name)
|
|
{
|
|
return __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 int __must_check device_reprobe(struct device *dev);
|
|
|
|
/*
|
|
* Easy functions for dynamically creating devices on the fly
|
|
*/
|
|
extern struct device *device_create_vargs(struct class *cls,
|
|
struct device *parent,
|
|
dev_t devt,
|
|
void *drvdata,
|
|
const char *fmt,
|
|
va_list vargs);
|
|
extern struct device *device_create(struct class *cls, struct device *parent,
|
|
dev_t devt, void *drvdata,
|
|
const char *fmt, ...)
|
|
__attribute__((format(printf, 5, 6)));
|
|
extern void device_destroy(struct class *cls, dev_t devt);
|
|
|
|
/*
|
|
* Platform "fixup" functions - allow the platform to have their say
|
|
* about devices and actions that the general device layer doesn't
|
|
* know about.
|
|
*/
|
|
/* Notify platform of device discovery */
|
|
extern int (*platform_notify)(struct device *dev);
|
|
|
|
extern int (*platform_notify_remove)(struct device *dev);
|
|
|
|
|
|
/*
|
|
* get_device - atomically increment the reference count for the device.
|
|
*
|
|
*/
|
|
extern struct device *get_device(struct device *dev);
|
|
extern void put_device(struct device *dev);
|
|
|
|
extern void wait_for_device_probe(void);
|
|
|
|
#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);
|
|
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
|
|
extern int dev_printk(const char *level, const struct device *dev,
|
|
const char *fmt, ...)
|
|
__attribute__ ((format (printf, 3, 4)));
|
|
extern int dev_emerg(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
extern int dev_alert(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
extern int dev_crit(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
extern int dev_err(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
extern int dev_warn(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
extern int dev_notice(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
extern int _dev_info(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
|
|
#else
|
|
|
|
static inline int dev_printk(const char *level, const struct device *dev,
|
|
const char *fmt, ...)
|
|
__attribute__ ((format (printf, 3, 4)));
|
|
static inline int dev_printk(const char *level, const struct device *dev,
|
|
const char *fmt, ...)
|
|
{ return 0; }
|
|
|
|
static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
static inline int dev_emerg(const struct device *dev, const char *fmt, ...)
|
|
{ return 0; }
|
|
static inline int dev_crit(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
static inline int dev_crit(const struct device *dev, const char *fmt, ...)
|
|
{ return 0; }
|
|
static inline int dev_alert(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
static inline int dev_alert(const struct device *dev, const char *fmt, ...)
|
|
{ return 0; }
|
|
static inline int dev_err(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
static inline int dev_err(const struct device *dev, const char *fmt, ...)
|
|
{ return 0; }
|
|
static inline int dev_warn(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
static inline int dev_warn(const struct device *dev, const char *fmt, ...)
|
|
{ return 0; }
|
|
static inline int dev_notice(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
static inline int dev_notice(const struct device *dev, const char *fmt, ...)
|
|
{ return 0; }
|
|
static inline int _dev_info(const struct device *dev, const char *fmt, ...)
|
|
__attribute__ ((format (printf, 2, 3)));
|
|
static inline int _dev_info(const struct device *dev, const char *fmt, ...)
|
|
{ return 0; }
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Stupid hackaround for existing uses of non-printk uses dev_info
|
|
*
|
|
* Note that the definition of dev_info below is actually _dev_info
|
|
* and a macro is used to avoid redefining dev_info
|
|
*/
|
|
|
|
#define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
|
|
|
|
#if defined(DEBUG)
|
|
#define dev_dbg(dev, format, arg...) \
|
|
dev_printk(KERN_DEBUG, dev, format, ##arg)
|
|
#elif defined(CONFIG_DYNAMIC_DEBUG)
|
|
#define dev_dbg(dev, format, ...) \
|
|
do { \
|
|
dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
|
|
} while (0)
|
|
#else
|
|
#define dev_dbg(dev, format, arg...) \
|
|
({ \
|
|
if (0) \
|
|
dev_printk(KERN_DEBUG, dev, format, ##arg); \
|
|
0; \
|
|
})
|
|
#endif
|
|
|
|
#ifdef VERBOSE_DEBUG
|
|
#define dev_vdbg dev_dbg
|
|
#else
|
|
#define dev_vdbg(dev, format, arg...) \
|
|
({ \
|
|
if (0) \
|
|
dev_printk(KERN_DEBUG, dev, format, ##arg); \
|
|
0; \
|
|
})
|
|
#endif
|
|
|
|
/*
|
|
* dev_WARN*() acts like dev_printk(), but with the key difference
|
|
* of using a WARN/WARN_ON to get the message out, including the
|
|
* file/line information and a backtrace.
|
|
*/
|
|
#define dev_WARN(dev, format, arg...) \
|
|
WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
|
|
|
|
#define dev_WARN_ONCE(dev, condition, format, arg...) \
|
|
WARN_ONCE(condition, "Device %s\n" format, \
|
|
dev_driver_string(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
|
|
|
|
#endif /* _DEVICE_H_ */
|