540 lines
17 KiB
C
540 lines
17 KiB
C
/*
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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) 2004-2007 Greg Kroah-Hartman <gregkh@suse.de>
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*
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* This file is released under the GPLv2
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*
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* See Documentation/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/compiler.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/semaphore.h>
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#include <asm/atomic.h>
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#include <asm/device.h>
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#define DEVICE_NAME_SIZE 50
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/* DEVICE_NAME_HALF is really less than half to accommodate slop */
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#define DEVICE_NAME_HALF __stringify(20)
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#define DEVICE_ID_SIZE 32
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#define BUS_ID_SIZE KOBJ_NAME_LEN
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struct device;
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struct device_driver;
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struct driver_private;
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struct class;
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struct bus_type;
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struct bus_type_private;
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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(_name, _mode, _show, _store) \
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struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
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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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struct bus_type {
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const char *name;
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struct bus_attribute *bus_attrs;
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struct device_attribute *dev_attrs;
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struct driver_attribute *drv_attrs;
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int (*match)(struct device *dev, struct device_driver *drv);
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int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
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int (*probe)(struct device *dev);
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int (*remove)(struct device *dev);
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void (*shutdown)(struct device *dev);
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int (*suspend)(struct device *dev, pm_message_t state);
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int (*suspend_late)(struct device *dev, pm_message_t state);
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int (*resume_early)(struct device *dev);
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int (*resume)(struct device *dev);
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struct bus_type_private *p;
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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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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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void *data,
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int (*match)(struct device *dev, void *data));
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struct device *bus_find_device_by_name(struct bus_type *bus,
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struct device *start,
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const char *name);
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int __must_check bus_for_each_drv(struct bus_type *bus,
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struct device_driver *start, void *data,
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int (*fn)(struct device_driver *, void *));
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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 semaphore 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 removed */
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#define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
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#define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
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unbound */
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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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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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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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struct attribute_group **groups;
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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 *get_driver(struct device_driver *drv);
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extern void put_driver(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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/* 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(_name, _mode, _show, _store) \
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struct driver_attribute driver_attr_##_name = \
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__ATTR(_name, _mode, _show, _store)
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extern int __must_check driver_create_file(struct device_driver *driver,
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struct driver_attribute *attr);
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extern void driver_remove_file(struct device_driver *driver,
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struct driver_attribute *attr);
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extern int __must_check driver_add_kobj(struct device_driver *drv,
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struct kobject *kobj,
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const char *fmt, ...);
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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, void *data,
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int (*match)(struct device *dev, void *data));
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/*
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* device classes
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*/
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struct class {
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const char *name;
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struct module *owner;
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struct kset subsys;
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struct list_head devices;
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struct list_head interfaces;
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struct kset class_dirs;
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struct semaphore sem; /* locks children, devices, interfaces */
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struct class_attribute *class_attrs;
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struct device_attribute *dev_attrs;
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int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
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void (*class_release)(struct class *class);
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void (*dev_release)(struct device *dev);
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int (*suspend)(struct device *dev, pm_message_t state);
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int (*resume)(struct device *dev);
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};
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extern int __must_check class_register(struct class *class);
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extern void class_unregister(struct class *class);
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extern int class_for_each_device(struct class *class, void *data,
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int (*fn)(struct device *dev, void *data));
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extern struct device *class_find_device(struct class *class, void *data,
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int (*match)(struct device *, void *));
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struct class_attribute {
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struct attribute attr;
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ssize_t (*show)(struct class *class, char *buf);
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ssize_t (*store)(struct class *class, const char *buf, size_t count);
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};
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#define CLASS_ATTR(_name, _mode, _show, _store) \
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struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
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extern int __must_check class_create_file(struct class *class,
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const struct class_attribute *attr);
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extern void class_remove_file(struct class *class,
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const struct class_attribute *attr);
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struct class_interface {
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struct list_head node;
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struct class *class;
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int (*add_dev) (struct device *, struct class_interface *);
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void (*remove_dev) (struct device *, struct class_interface *);
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};
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extern int __must_check class_interface_register(struct class_interface *);
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extern void class_interface_unregister(struct class_interface *);
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extern struct class *class_create(struct module *owner, const char *name);
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extern void class_destroy(struct class *cls);
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/*
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* The type of device, "struct device" is embedded in. A class
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* or bus can contain devices of different types
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* like "partitions" and "disks", "mouse" and "event".
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* This identifies the device type and carries type-specific
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* information, equivalent to the kobj_type of a kobject.
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* If "name" is specified, the uevent will contain it in
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* the DEVTYPE variable.
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*/
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struct device_type {
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const char *name;
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struct attribute_group **groups;
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int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
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void (*release)(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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};
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/* interface for exporting device attributes */
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struct device_attribute {
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struct attribute attr;
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ssize_t (*show)(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t (*store)(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count);
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};
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#define DEVICE_ATTR(_name, _mode, _show, _store) \
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struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
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extern int __must_check device_create_file(struct device *device,
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struct device_attribute *entry);
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extern void device_remove_file(struct device *dev,
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struct device_attribute *attr);
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extern int __must_check device_create_bin_file(struct device *dev,
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struct bin_attribute *attr);
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extern void device_remove_bin_file(struct device *dev,
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struct bin_attribute *attr);
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extern int device_schedule_callback_owner(struct device *dev,
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void (*func)(struct device *dev), struct module *owner);
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/* This is a macro to avoid include problems with THIS_MODULE */
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#define device_schedule_callback(dev, func) \
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device_schedule_callback_owner(dev, func, THIS_MODULE)
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/* device resource management */
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typedef void (*dr_release_t)(struct device *dev, void *res);
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typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
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#ifdef CONFIG_DEBUG_DEVRES
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extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
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const char *name);
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#define devres_alloc(release, size, gfp) \
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__devres_alloc(release, size, gfp, #release)
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#else
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extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
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#endif
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extern void devres_free(void *res);
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extern void devres_add(struct device *dev, void *res);
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extern void *devres_find(struct device *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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extern void *devres_get(struct device *dev, void *new_res,
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dr_match_t match, void *match_data);
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extern void *devres_remove(struct device *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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extern int devres_destroy(struct device *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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/* devres group */
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extern void * __must_check devres_open_group(struct device *dev, void *id,
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gfp_t gfp);
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extern void devres_close_group(struct device *dev, void *id);
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extern void devres_remove_group(struct device *dev, void *id);
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extern int devres_release_group(struct device *dev, void *id);
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/* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
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extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
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extern void devm_kfree(struct device *dev, void *p);
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struct device_dma_parameters {
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/*
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* a low level driver may set these to teach IOMMU code about
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* sg limitations.
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*/
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unsigned int max_segment_size;
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unsigned long segment_boundary_mask;
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};
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struct device {
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struct klist klist_children;
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struct klist_node knode_parent; /* node in sibling list */
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struct klist_node knode_driver;
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struct klist_node knode_bus;
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struct device *parent;
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struct kobject kobj;
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char bus_id[BUS_ID_SIZE]; /* position on parent bus */
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struct device_type *type;
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unsigned uevent_suppress:1;
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struct semaphore sem; /* semaphore to synchronize calls to
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* its driver.
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*/
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struct bus_type *bus; /* type of bus device is on */
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struct device_driver *driver; /* which driver has allocated this
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device */
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void *driver_data; /* data private to the driver */
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void *platform_data; /* Platform specific data, device
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core doesn't touch it */
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struct dev_pm_info power;
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#ifdef CONFIG_NUMA
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int numa_node; /* NUMA node this device is close to */
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#endif
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u64 *dma_mask; /* dma mask (if dma'able device) */
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u64 coherent_dma_mask;/* Like dma_mask, but for
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alloc_coherent mappings as
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not all hardware supports
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64 bit addresses for consistent
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allocations such descriptors. */
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struct device_dma_parameters *dma_parms;
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struct list_head dma_pools; /* dma pools (if dma'ble) */
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struct dma_coherent_mem *dma_mem; /* internal for coherent mem
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override */
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/* arch specific additions */
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struct dev_archdata archdata;
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spinlock_t devres_lock;
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struct list_head devres_head;
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struct list_head node;
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struct class *class;
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dev_t devt; /* dev_t, creates the sysfs "dev" */
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struct attribute_group **groups; /* optional groups */
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void (*release)(struct device *dev);
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};
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/* Get the wakeup routines, which depend on struct device */
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#include <linux/pm_wakeup.h>
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static inline const char *dev_name(struct device *dev)
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{
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/* will be changed into kobject_name(&dev->kobj) in the near future */
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return dev->bus_id;
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}
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extern int dev_set_name(struct device *dev, const char *name, ...)
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__attribute__((format(printf, 2, 3)));
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#ifdef CONFIG_NUMA
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static inline int dev_to_node(struct device *dev)
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{
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return dev->numa_node;
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}
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static inline void set_dev_node(struct device *dev, int node)
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{
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dev->numa_node = node;
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}
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#else
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static inline int dev_to_node(struct device *dev)
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{
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return -1;
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}
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static inline void set_dev_node(struct device *dev, int node)
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{
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}
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#endif
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static inline void *dev_get_drvdata(struct device *dev)
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{
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return dev->driver_data;
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}
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static inline void dev_set_drvdata(struct device *dev, void *data)
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{
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dev->driver_data = data;
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}
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static inline int device_is_registered(struct device *dev)
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{
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return dev->kobj.state_in_sysfs;
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}
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void driver_init(void);
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/*
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* High level routines for use by the bus drivers
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*/
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extern int __must_check device_register(struct device *dev);
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extern void device_unregister(struct device *dev);
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extern void device_initialize(struct device *dev);
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extern int __must_check device_add(struct device *dev);
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extern void device_del(struct device *dev);
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extern int device_for_each_child(struct device *dev, void *data,
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int (*fn)(struct device *dev, void *data));
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extern struct device *device_find_child(struct device *dev, void *data,
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int (*match)(struct device *dev, void *data));
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extern int device_rename(struct device *dev, char *new_name);
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extern int device_move(struct device *dev, struct device *new_parent);
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/*
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* Manual binding of a device to driver. See drivers/base/bus.c
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* for information on use.
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*/
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extern int __must_check device_bind_driver(struct device *dev);
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extern void device_release_driver(struct device *dev);
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extern int __must_check device_attach(struct device *dev);
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extern int __must_check driver_attach(struct device_driver *drv);
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extern int __must_check device_reprobe(struct device *dev);
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/*
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* Easy functions for dynamically creating devices on the fly
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*/
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extern struct device *device_create_vargs(struct class *cls,
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struct device *parent,
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dev_t devt,
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void *drvdata,
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const char *fmt,
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va_list vargs);
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extern struct device *device_create(struct class *cls, struct device *parent,
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dev_t devt, const char *fmt, ...)
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__attribute__((format(printf, 4, 5)));
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extern struct device *device_create_drvdata(struct class *cls,
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struct device *parent,
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dev_t devt,
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void *drvdata,
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const char *fmt, ...)
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__attribute__((format(printf, 5, 6)));
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extern void device_destroy(struct class *cls, dev_t devt);
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/*
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* Platform "fixup" functions - allow the platform to have their say
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* about devices and actions that the general device layer doesn't
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* know about.
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*/
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/* Notify platform of device discovery */
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extern int (*platform_notify)(struct device *dev);
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extern int (*platform_notify_remove)(struct device *dev);
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/**
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* get_device - atomically increment the reference count for the device.
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*
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*/
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extern struct device *get_device(struct device *dev);
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extern void put_device(struct device *dev);
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/* drivers/base/power/shutdown.c */
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extern void device_shutdown(void);
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/* drivers/base/sys.c */
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extern void sysdev_shutdown(void);
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/* debugging and troubleshooting/diagnostic helpers. */
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extern const char *dev_driver_string(struct device *dev);
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#define dev_printk(level, dev, format, arg...) \
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printk(level "%s %s: " format , dev_driver_string(dev) , \
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dev_name(dev) , ## arg)
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#define dev_emerg(dev, format, arg...) \
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dev_printk(KERN_EMERG , dev , format , ## arg)
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#define dev_alert(dev, format, arg...) \
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dev_printk(KERN_ALERT , dev , format , ## arg)
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#define dev_crit(dev, format, arg...) \
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dev_printk(KERN_CRIT , dev , format , ## arg)
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#define dev_err(dev, format, arg...) \
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dev_printk(KERN_ERR , dev , format , ## arg)
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#define dev_warn(dev, format, arg...) \
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dev_printk(KERN_WARNING , dev , format , ## arg)
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#define dev_notice(dev, format, arg...) \
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dev_printk(KERN_NOTICE , dev , format , ## arg)
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#define dev_info(dev, format, arg...) \
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dev_printk(KERN_INFO , dev , format , ## arg)
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#ifdef DEBUG
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#define dev_dbg(dev, format, arg...) \
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dev_printk(KERN_DEBUG , dev , format , ## arg)
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#else
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#define dev_dbg(dev, format, arg...) \
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({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
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#endif
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#ifdef VERBOSE_DEBUG
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#define dev_vdbg dev_dbg
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#else
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#define dev_vdbg(dev, format, arg...) \
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({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
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#endif
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/* Create alias, so I can be autoloaded. */
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#define MODULE_ALIAS_CHARDEV(major,minor) \
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MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
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#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
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MODULE_ALIAS("char-major-" __stringify(major) "-*")
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#endif /* _DEVICE_H_ */
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