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- /*
- * device.h - generic, centralized driver model
- *
- * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
- * Copyright (c) 2004-2007 Greg Kroah-Hartman <gregkh@suse.de>
- *
- * 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 <linux/semaphore.h>
- #include <asm/atomic.h>
- #include <asm/device.h>
-
- #define BUS_ID_SIZE 20
-
- struct device;
- struct device_driver;
- struct driver_private;
- struct class;
- struct class_private;
- struct bus_type;
- struct bus_type_private;
-
- 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 {
- 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 (*suspend_late)(struct device *dev, pm_message_t state);
- int (*resume_early)(struct device *dev);
- int (*resume)(struct device *dev);
-
- struct pm_ext_ops *pm;
-
- struct bus_type_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 __must_check 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 semaphore 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_BOUND_DRIVER 0x00000003 /* driver bound to device */
- #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
- unbound */
-
- extern struct kset *bus_get_kset(struct bus_type *bus);
- extern struct klist *bus_get_device_klist(struct bus_type *bus);
-
- struct device_driver {
- const char *name;
- struct bus_type *bus;
-
- struct module *owner;
- const char *mod_name; /* used for built-in modules */
-
- 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);
- struct attribute_group **groups;
-
- struct 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);
-
- /* 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,
- struct driver_attribute *attr);
- extern void driver_remove_file(struct device_driver *driver,
- 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));
-
- /*
- * device classes
- */
- struct class {
- const char *name;
- struct module *owner;
-
- struct class_attribute *class_attrs;
- struct device_attribute *dev_attrs;
- struct kobject *dev_kobj;
-
- int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
-
- 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);
-
- struct pm_ops *pm;
- struct class_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); \
- })
-
- 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, char *buf);
- ssize_t (*store)(struct class *class, 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);
-
- 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;
- struct attribute_group **groups;
- int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
- void (*release)(struct device *dev);
-
- int (*suspend)(struct device *dev, pm_message_t state);
- int (*resume)(struct device *dev);
-
- struct 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,
- struct device_attribute *entry);
- extern void device_remove_file(struct device *dev,
- struct device_attribute *attr);
- extern int __must_check device_create_bin_file(struct device *dev,
- struct bin_attribute *attr);
- extern void device_remove_bin_file(struct device *dev,
- 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 {
- struct klist klist_children;
- struct klist_node knode_parent; /* node in sibling list */
- struct klist_node knode_driver;
- struct klist_node knode_bus;
- struct device *parent;
-
- struct kobject kobj;
- char bus_id[BUS_ID_SIZE]; /* position on parent bus */
- const char *init_name; /* initial name of the device */
- struct device_type *type;
- unsigned uevent_suppress:1;
-
- struct semaphore sem; /* semaphore 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 *driver_data; /* data private to the driver */
- void *platform_data; /* Platform specific data, device
- core doesn't touch it */
- struct dev_pm_info power;
-
- #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;
-
- spinlock_t devres_lock;
- struct list_head devres_head;
-
- struct klist_node knode_class;
- struct class *class;
- dev_t devt; /* dev_t, creates the sysfs "dev" */
- 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)
- {
- /* will be changed into kobject_name(&dev->kobj) in the near future */
- return dev->bus_id;
- }
-
- 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 void *dev_get_drvdata(const struct device *dev)
- {
- return dev->driver_data;
- }
-
- static inline void dev_set_drvdata(struct device *dev, void *data)
- {
- dev->driver_data = data;
- }
-
- static inline int device_is_registered(struct device *dev)
- {
- return dev->kobj.state_in_sysfs;
- }
-
- 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, 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_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);
-
-
- /* drivers/base/power/shutdown.c */
- extern void device_shutdown(void);
-
- /* drivers/base/sys.c */
- extern void sysdev_shutdown(void);
-
- /* debugging and troubleshooting/diagnostic helpers. */
- extern const char *dev_driver_string(const struct device *dev);
- #define dev_printk(level, dev, format, arg...) \
- printk(level "%s %s: " format , dev_driver_string(dev) , \
- dev_name(dev) , ## arg)
-
- #define dev_emerg(dev, format, arg...) \
- dev_printk(KERN_EMERG , dev , format , ## arg)
- #define dev_alert(dev, format, arg...) \
- dev_printk(KERN_ALERT , dev , format , ## arg)
- #define dev_crit(dev, format, arg...) \
- dev_printk(KERN_CRIT , dev , format , ## arg)
- #define dev_err(dev, format, arg...) \
- dev_printk(KERN_ERR , 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)
- #define dev_info(dev, format, arg...) \
- dev_printk(KERN_INFO , dev , format , ## arg)
-
- #if defined(CONFIG_DYNAMIC_PRINTK_DEBUG)
- #define dev_dbg(dev, format, ...) do { \
- dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
- } while (0)
- #elif defined(DEBUG)
- #define dev_dbg(dev, format, arg...) \
- dev_printk(KERN_DEBUG , dev , format , ## arg)
- #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);
-
- /* 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_ */
-