575 lines
19 KiB
C
575 lines
19 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 <asm/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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#define DEVICE_NAME_HALF __stringify(20) /* Less than half to accommodate slop */
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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 class;
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struct class_device;
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struct bus_type {
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const char * name;
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struct subsystem subsys;
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struct kset drivers;
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struct kset devices;
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struct klist klist_devices;
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struct klist klist_drivers;
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struct blocking_notifier_head bus_notifier;
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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, char **envp,
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int num_envp, char *buffer, int buffer_size);
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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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};
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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 *, void *));
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struct device * bus_find_device(struct bus_type *bus, struct device *start,
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void *data, int (*match)(struct device *, void *));
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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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/* sysfs interface for exporting bus attributes */
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struct bus_attribute {
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struct attribute attr;
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ssize_t (*show)(struct bus_type *, char * buf);
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ssize_t (*store)(struct bus_type *, 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 device_driver {
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const char * name;
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struct bus_type * bus;
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struct completion unloaded;
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struct kobject kobj;
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struct klist klist_devices;
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struct klist_node knode_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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struct module_kobject * mkobj;
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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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unsigned int multithread_probe:1;
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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, 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 *, char * buf);
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ssize_t (*store)(struct device_driver *, const char * buf, 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 = __ATTR(_name,_mode,_show,_store)
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extern int __must_check driver_create_file(struct device_driver *,
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struct driver_attribute *);
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extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
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extern int __must_check driver_for_each_device(struct device_driver * drv,
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struct device *start, void *data,
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int (*fn)(struct device *, 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 *, void *));
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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 subsystem subsys;
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struct list_head children;
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struct list_head devices;
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struct list_head interfaces;
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struct semaphore sem; /* locks both the children and interfaces lists */
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struct kobject *virtual_dir;
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struct class_attribute * class_attrs;
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struct class_device_attribute * class_dev_attrs;
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struct device_attribute * dev_attrs;
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int (*uevent)(struct class_device *dev, char **envp,
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int num_envp, char *buffer, int buffer_size);
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int (*dev_uevent)(struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size);
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void (*release)(struct class_device *dev);
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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 *, pm_message_t state);
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int (*resume)(struct device *);
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};
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extern int __must_check class_register(struct class *);
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extern void class_unregister(struct class *);
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struct class_attribute {
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struct attribute attr;
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ssize_t (*show)(struct class *, char * buf);
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ssize_t (*store)(struct 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 *,
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const struct class_attribute *);
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extern void class_remove_file(struct class *, const struct class_attribute *);
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struct class_device_attribute {
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struct attribute attr;
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ssize_t (*show)(struct class_device *, char * buf);
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ssize_t (*store)(struct class_device *, const char * buf, size_t count);
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};
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#define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
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struct class_device_attribute class_device_attr_##_name = \
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__ATTR(_name,_mode,_show,_store)
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extern int __must_check class_device_create_file(struct class_device *,
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const struct class_device_attribute *);
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/**
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* struct class_device - class devices
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* @class: pointer to the parent class for this class device. This is required.
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* @devt: for internal use by the driver core only.
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* @node: for internal use by the driver core only.
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* @kobj: for internal use by the driver core only.
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* @devt_attr: for internal use by the driver core only.
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* @groups: optional additional groups to be created
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* @dev: if set, a symlink to the struct device is created in the sysfs
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* directory for this struct class device.
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* @class_data: pointer to whatever you want to store here for this struct
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* class_device. Use class_get_devdata() and class_set_devdata() to get and
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* set this pointer.
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* @parent: pointer to a struct class_device that is the parent of this struct
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* class_device. If NULL, this class_device will show up at the root of the
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* struct class in sysfs (which is probably what you want to have happen.)
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* @release: pointer to a release function for this struct class_device. If
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* set, this will be called instead of the class specific release function.
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* Only use this if you want to override the default release function, like
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* when you are nesting class_device structures.
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* @uevent: pointer to a uevent function for this struct class_device. If
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* set, this will be called instead of the class specific uevent function.
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* Only use this if you want to override the default uevent function, like
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* when you are nesting class_device structures.
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*/
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struct class_device {
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struct list_head node;
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struct kobject kobj;
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struct class * class; /* required */
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dev_t devt; /* dev_t, creates the sysfs "dev" */
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struct class_device_attribute *devt_attr;
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struct class_device_attribute uevent_attr;
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struct device * dev; /* not necessary, but nice to have */
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void * class_data; /* class-specific data */
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struct class_device *parent; /* parent of this child device, if there is one */
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struct attribute_group ** groups; /* optional groups */
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void (*release)(struct class_device *dev);
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int (*uevent)(struct class_device *dev, char **envp,
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int num_envp, char *buffer, int buffer_size);
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char class_id[BUS_ID_SIZE]; /* unique to this class */
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};
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static inline void *
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class_get_devdata (struct class_device *dev)
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{
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return dev->class_data;
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}
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static inline void
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class_set_devdata (struct class_device *dev, void *data)
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{
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dev->class_data = data;
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}
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extern int __must_check class_device_register(struct class_device *);
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extern void class_device_unregister(struct class_device *);
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extern void class_device_initialize(struct class_device *);
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extern int __must_check class_device_add(struct class_device *);
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extern void class_device_del(struct class_device *);
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extern struct class_device * class_device_get(struct class_device *);
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extern void class_device_put(struct class_device *);
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extern void class_device_remove_file(struct class_device *,
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const struct class_device_attribute *);
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extern int __must_check class_device_create_bin_file(struct class_device *,
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struct bin_attribute *);
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extern void class_device_remove_bin_file(struct class_device *,
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struct bin_attribute *);
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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) (struct class_device *, struct class_interface *);
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void (*remove) (struct class_device *, struct class_interface *);
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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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extern struct class_device *class_device_create(struct class *cls,
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struct class_device *parent,
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dev_t devt,
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struct device *device,
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const char *fmt, ...)
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__attribute__((format(printf,5,6)));
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extern void class_device_destroy(struct class *cls, dev_t devt);
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struct device_type {
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struct device_attribute *attrs;
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int (*uevent)(struct device *dev, char **envp, int num_envp,
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char *buffer, int buffer_size);
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void (*release)(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, 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(struct device *dev,
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void (*func)(struct device *));
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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 {
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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 is_registered:1;
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struct device_attribute uevent_attr;
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struct device_attribute *devt_attr;
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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 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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/* class_device migration path */
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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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int uevent_suppress;
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void (*release)(struct device * dev);
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};
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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 *
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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
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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->is_registered;
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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 *, void *,
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int (*fn)(struct device *, void *));
|
|
extern struct device *device_find_child(struct device *, void *data,
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|
int (*match)(struct device *, void *));
|
|
extern int device_rename(struct device *dev, char *new_name);
|
|
extern int device_move(struct device *dev, struct device *new_parent);
|
|
|
|
/*
|
|
* 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(struct class *cls, struct device *parent,
|
|
dev_t devt, const char *fmt, ...)
|
|
__attribute__((format(printf,4,5)));
|
|
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);
|
|
|
|
|
|
/* drivers/base/power/shutdown.c */
|
|
extern void device_shutdown(void);
|
|
|
|
|
|
/* drivers/base/firmware.c */
|
|
extern int __must_check firmware_register(struct subsystem *);
|
|
extern void firmware_unregister(struct subsystem *);
|
|
|
|
/* debugging and troubleshooting/diagnostic helpers. */
|
|
extern const char *dev_driver_string(struct device *dev);
|
|
#define dev_printk(level, dev, format, arg...) \
|
|
printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
|
|
|
|
#ifdef DEBUG
|
|
#define dev_dbg(dev, format, arg...) \
|
|
dev_printk(KERN_DEBUG , dev , format , ## arg)
|
|
#else
|
|
#define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
|
|
#endif
|
|
|
|
#define dev_err(dev, format, arg...) \
|
|
dev_printk(KERN_ERR , dev , format , ## arg)
|
|
#define dev_info(dev, format, arg...) \
|
|
dev_printk(KERN_INFO , dev , format , ## arg)
|
|
#define dev_warn(dev, format, arg...) \
|
|
dev_printk(KERN_WARNING , dev , format , ## arg)
|
|
#define dev_notice(dev, format, arg...) \
|
|
dev_printk(KERN_NOTICE , dev , format , ## 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) "-*")
|
|
#endif /* _DEVICE_H_ */
|