Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/include/linux/device.h

  1 /*
  2  * device.h - generic, centralized driver model
  3  *
  4  * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
  5  * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
  6  * Copyright (c) 2008-2009 Novell Inc.
  7  *
  8  * This file is released under the GPLv2
  9  *
 10  * See Documentation/driver-model/ for more information.
 11  */
 12 
 13 #ifndef _DEVICE_H_
 14 #define _DEVICE_H_
 15 
 16 #include <linux/ioport.h>
 17 #include <linux/kobject.h>
 18 #include <linux/klist.h>
 19 #include <linux/list.h>
 20 #include <linux/lockdep.h>
 21 #include <linux/compiler.h>
 22 #include <linux/types.h>
 23 #include <linux/mutex.h>
 24 #include <linux/pinctrl/devinfo.h>
 25 #include <linux/pm.h>
 26 #include <linux/atomic.h>
 27 #include <linux/ratelimit.h>
 28 #include <linux/uidgid.h>
 29 #include <linux/gfp.h>
 30 #include <asm/device.h>
 31 
 32 struct device;
 33 struct device_private;
 34 struct device_driver;
 35 struct driver_private;
 36 struct module;
 37 struct class;
 38 struct subsys_private;
 39 struct bus_type;
 40 struct device_node;
 41 struct iommu_ops;
 42 struct iommu_group;
 43 
 44 struct bus_attribute {
 45         struct attribute        attr;
 46         ssize_t (*show)(struct bus_type *bus, char *buf);
 47         ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
 48 };
 49 
 50 #define BUS_ATTR(_name, _mode, _show, _store)   \
 51         struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
 52 #define BUS_ATTR_RW(_name) \
 53         struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
 54 #define BUS_ATTR_RO(_name) \
 55         struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
 56 
 57 extern int __must_check bus_create_file(struct bus_type *,
 58                                         struct bus_attribute *);
 59 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
 60 
 61 /**
 62  * struct bus_type - The bus type of the device
 63  *
 64  * @name:       The name of the bus.
 65  * @dev_name:   Used for subsystems to enumerate devices like ("foo%u", dev->id).
 66  * @dev_root:   Default device to use as the parent.
 67  * @dev_attrs:  Default attributes of the devices on the bus.
 68  * @bus_groups: Default attributes of the bus.
 69  * @dev_groups: Default attributes of the devices on the bus.
 70  * @drv_groups: Default attributes of the device drivers on the bus.
 71  * @match:      Called, perhaps multiple times, whenever a new device or driver
 72  *              is added for this bus. It should return a nonzero value if the
 73  *              given device can be handled by the given driver.
 74  * @uevent:     Called when a device is added, removed, or a few other things
 75  *              that generate uevents to add the environment variables.
 76  * @probe:      Called when a new device or driver add to this bus, and callback
 77  *              the specific driver's probe to initial the matched device.
 78  * @remove:     Called when a device removed from this bus.
 79  * @shutdown:   Called at shut-down time to quiesce the device.
 80  *
 81  * @online:     Called to put the device back online (after offlining it).
 82  * @offline:    Called to put the device offline for hot-removal. May fail.
 83  *
 84  * @suspend:    Called when a device on this bus wants to go to sleep mode.
 85  * @resume:     Called to bring a device on this bus out of sleep mode.
 86  * @pm:         Power management operations of this bus, callback the specific
 87  *              device driver's pm-ops.
 88  * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
 89  *              driver implementations to a bus and allow the driver to do
 90  *              bus-specific setup
 91  * @p:          The private data of the driver core, only the driver core can
 92  *              touch this.
 93  * @lock_key:   Lock class key for use by the lock validator
 94  *
 95  * A bus is a channel between the processor and one or more devices. For the
 96  * purposes of the device model, all devices are connected via a bus, even if
 97  * it is an internal, virtual, "platform" bus. Buses can plug into each other.
 98  * A USB controller is usually a PCI device, for example. The device model
 99  * represents the actual connections between buses and the devices they control.
100  * A bus is represented by the bus_type structure. It contains the name, the
101  * default attributes, the bus' methods, PM operations, and the driver core's
102  * private data.
103  */
104 struct bus_type {
105         const char              *name;
106         const char              *dev_name;
107         struct device           *dev_root;
108         struct device_attribute *dev_attrs;     /* use dev_groups instead */
109         const struct attribute_group **bus_groups;
110         const struct attribute_group **dev_groups;
111         const struct attribute_group **drv_groups;
112 
113         int (*match)(struct device *dev, struct device_driver *drv);
114         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
115         int (*probe)(struct device *dev);
116         int (*remove)(struct device *dev);
117         void (*shutdown)(struct device *dev);
118 
119         int (*online)(struct device *dev);
120         int (*offline)(struct device *dev);
121 
122         int (*suspend)(struct device *dev, pm_message_t state);
123         int (*resume)(struct device *dev);
124 
125         const struct dev_pm_ops *pm;
126 
127         const struct iommu_ops *iommu_ops;
128 
129         struct subsys_private *p;
130         struct lock_class_key lock_key;
131 };
132 
133 extern int __must_check bus_register(struct bus_type *bus);
134 
135 extern void bus_unregister(struct bus_type *bus);
136 
137 extern int __must_check bus_rescan_devices(struct bus_type *bus);
138 
139 /* iterator helpers for buses */
140 struct subsys_dev_iter {
141         struct klist_iter               ki;
142         const struct device_type        *type;
143 };
144 void subsys_dev_iter_init(struct subsys_dev_iter *iter,
145                          struct bus_type *subsys,
146                          struct device *start,
147                          const struct device_type *type);
148 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
149 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
150 
151 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
152                      int (*fn)(struct device *dev, void *data));
153 struct device *bus_find_device(struct bus_type *bus, struct device *start,
154                                void *data,
155                                int (*match)(struct device *dev, void *data));
156 struct device *bus_find_device_by_name(struct bus_type *bus,
157                                        struct device *start,
158                                        const char *name);
159 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
160                                         struct device *hint);
161 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
162                      void *data, int (*fn)(struct device_driver *, void *));
163 void bus_sort_breadthfirst(struct bus_type *bus,
164                            int (*compare)(const struct device *a,
165                                           const struct device *b));
166 /*
167  * Bus notifiers: Get notified of addition/removal of devices
168  * and binding/unbinding of drivers to devices.
169  * In the long run, it should be a replacement for the platform
170  * notify hooks.
171  */
172 struct notifier_block;
173 
174 extern int bus_register_notifier(struct bus_type *bus,
175                                  struct notifier_block *nb);
176 extern int bus_unregister_notifier(struct bus_type *bus,
177                                    struct notifier_block *nb);
178 
179 /* All 4 notifers below get called with the target struct device *
180  * as an argument. Note that those functions are likely to be called
181  * with the device lock held in the core, so be careful.
182  */
183 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
184 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device removed */
185 #define BUS_NOTIFY_BIND_DRIVER          0x00000003 /* driver about to be
186                                                       bound */
187 #define BUS_NOTIFY_BOUND_DRIVER         0x00000004 /* driver bound to device */
188 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000005 /* driver about to be
189                                                       unbound */
190 #define BUS_NOTIFY_UNBOUND_DRIVER       0x00000006 /* driver is unbound
191                                                       from the device */
192 
193 extern struct kset *bus_get_kset(struct bus_type *bus);
194 extern struct klist *bus_get_device_klist(struct bus_type *bus);
195 
196 /**
197  * struct device_driver - The basic device driver structure
198  * @name:       Name of the device driver.
199  * @bus:        The bus which the device of this driver belongs to.
200  * @owner:      The module owner.
201  * @mod_name:   Used for built-in modules.
202  * @suppress_bind_attrs: Disables bind/unbind via sysfs.
203  * @of_match_table: The open firmware table.
204  * @acpi_match_table: The ACPI match table.
205  * @probe:      Called to query the existence of a specific device,
206  *              whether this driver can work with it, and bind the driver
207  *              to a specific device.
208  * @remove:     Called when the device is removed from the system to
209  *              unbind a device from this driver.
210  * @shutdown:   Called at shut-down time to quiesce the device.
211  * @suspend:    Called to put the device to sleep mode. Usually to a
212  *              low power state.
213  * @resume:     Called to bring a device from sleep mode.
214  * @groups:     Default attributes that get created by the driver core
215  *              automatically.
216  * @pm:         Power management operations of the device which matched
217  *              this driver.
218  * @p:          Driver core's private data, no one other than the driver
219  *              core can touch this.
220  *
221  * The device driver-model tracks all of the drivers known to the system.
222  * The main reason for this tracking is to enable the driver core to match
223  * up drivers with new devices. Once drivers are known objects within the
224  * system, however, a number of other things become possible. Device drivers
225  * can export information and configuration variables that are independent
226  * of any specific device.
227  */
228 struct device_driver {
229         const char              *name;
230         struct bus_type         *bus;
231 
232         struct module           *owner;
233         const char              *mod_name;      /* used for built-in modules */
234 
235         bool suppress_bind_attrs;       /* disables bind/unbind via sysfs */
236 
237         const struct of_device_id       *of_match_table;
238         const struct acpi_device_id     *acpi_match_table;
239 
240         int (*probe) (struct device *dev);
241         int (*remove) (struct device *dev);
242         void (*shutdown) (struct device *dev);
243         int (*suspend) (struct device *dev, pm_message_t state);
244         int (*resume) (struct device *dev);
245         const struct attribute_group **groups;
246 
247         const struct dev_pm_ops *pm;
248 
249         struct driver_private *p;
250 };
251 
252 
253 extern int __must_check driver_register(struct device_driver *drv);
254 extern void driver_unregister(struct device_driver *drv);
255 
256 extern struct device_driver *driver_find(const char *name,
257                                          struct bus_type *bus);
258 extern int driver_probe_done(void);
259 extern void wait_for_device_probe(void);
260 
261 
262 /* sysfs interface for exporting driver attributes */
263 
264 struct driver_attribute {
265         struct attribute attr;
266         ssize_t (*show)(struct device_driver *driver, char *buf);
267         ssize_t (*store)(struct device_driver *driver, const char *buf,
268                          size_t count);
269 };
270 
271 #define DRIVER_ATTR(_name, _mode, _show, _store) \
272         struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store)
273 #define DRIVER_ATTR_RW(_name) \
274         struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
275 #define DRIVER_ATTR_RO(_name) \
276         struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
277 #define DRIVER_ATTR_WO(_name) \
278         struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
279 
280 extern int __must_check driver_create_file(struct device_driver *driver,
281                                         const struct driver_attribute *attr);
282 extern void driver_remove_file(struct device_driver *driver,
283                                const struct driver_attribute *attr);
284 
285 extern int __must_check driver_for_each_device(struct device_driver *drv,
286                                                struct device *start,
287                                                void *data,
288                                                int (*fn)(struct device *dev,
289                                                          void *));
290 struct device *driver_find_device(struct device_driver *drv,
291                                   struct device *start, void *data,
292                                   int (*match)(struct device *dev, void *data));
293 
294 /**
295  * struct subsys_interface - interfaces to device functions
296  * @name:       name of the device function
297  * @subsys:     subsytem of the devices to attach to
298  * @node:       the list of functions registered at the subsystem
299  * @add_dev:    device hookup to device function handler
300  * @remove_dev: device hookup to device function handler
301  *
302  * Simple interfaces attached to a subsystem. Multiple interfaces can
303  * attach to a subsystem and its devices. Unlike drivers, they do not
304  * exclusively claim or control devices. Interfaces usually represent
305  * a specific functionality of a subsystem/class of devices.
306  */
307 struct subsys_interface {
308         const char *name;
309         struct bus_type *subsys;
310         struct list_head node;
311         int (*add_dev)(struct device *dev, struct subsys_interface *sif);
312         int (*remove_dev)(struct device *dev, struct subsys_interface *sif);
313 };
314 
315 int subsys_interface_register(struct subsys_interface *sif);
316 void subsys_interface_unregister(struct subsys_interface *sif);
317 
318 int subsys_system_register(struct bus_type *subsys,
319                            const struct attribute_group **groups);
320 int subsys_virtual_register(struct bus_type *subsys,
321                             const struct attribute_group **groups);
322 
323 /**
324  * struct class - device classes
325  * @name:       Name of the class.
326  * @owner:      The module owner.
327  * @class_attrs: Default attributes of this class.
328  * @dev_groups: Default attributes of the devices that belong to the class.
329  * @dev_kobj:   The kobject that represents this class and links it into the hierarchy.
330  * @dev_uevent: Called when a device is added, removed from this class, or a
331  *              few other things that generate uevents to add the environment
332  *              variables.
333  * @devnode:    Callback to provide the devtmpfs.
334  * @class_release: Called to release this class.
335  * @dev_release: Called to release the device.
336  * @suspend:    Used to put the device to sleep mode, usually to a low power
337  *              state.
338  * @resume:     Used to bring the device from the sleep mode.
339  * @ns_type:    Callbacks so sysfs can detemine namespaces.
340  * @namespace:  Namespace of the device belongs to this class.
341  * @pm:         The default device power management operations of this class.
342  * @p:          The private data of the driver core, no one other than the
343  *              driver core can touch this.
344  *
345  * A class is a higher-level view of a device that abstracts out low-level
346  * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
347  * at the class level, they are all simply disks. Classes allow user space
348  * to work with devices based on what they do, rather than how they are
349  * connected or how they work.
350  */
351 struct class {
352         const char              *name;
353         struct module           *owner;
354 
355         struct class_attribute          *class_attrs;
356         const struct attribute_group    **dev_groups;
357         struct kobject                  *dev_kobj;
358 
359         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
360         char *(*devnode)(struct device *dev, umode_t *mode);
361 
362         void (*class_release)(struct class *class);
363         void (*dev_release)(struct device *dev);
364 
365         int (*suspend)(struct device *dev, pm_message_t state);
366         int (*resume)(struct device *dev);
367 
368         const struct kobj_ns_type_operations *ns_type;
369         const void *(*namespace)(struct device *dev);
370 
371         const struct dev_pm_ops *pm;
372 
373         struct subsys_private *p;
374 };
375 
376 struct class_dev_iter {
377         struct klist_iter               ki;
378         const struct device_type        *type;
379 };
380 
381 extern struct kobject *sysfs_dev_block_kobj;
382 extern struct kobject *sysfs_dev_char_kobj;
383 extern int __must_check __class_register(struct class *class,
384                                          struct lock_class_key *key);
385 extern void class_unregister(struct class *class);
386 
387 /* This is a #define to keep the compiler from merging different
388  * instances of the __key variable */
389 #define class_register(class)                   \
390 ({                                              \
391         static struct lock_class_key __key;     \
392         __class_register(class, &__key);        \
393 })
394 
395 struct class_compat;
396 struct class_compat *class_compat_register(const char *name);
397 void class_compat_unregister(struct class_compat *cls);
398 int class_compat_create_link(struct class_compat *cls, struct device *dev,
399                              struct device *device_link);
400 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
401                               struct device *device_link);
402 
403 extern void class_dev_iter_init(struct class_dev_iter *iter,
404                                 struct class *class,
405                                 struct device *start,
406                                 const struct device_type *type);
407 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
408 extern void class_dev_iter_exit(struct class_dev_iter *iter);
409 
410 extern int class_for_each_device(struct class *class, struct device *start,
411                                  void *data,
412                                  int (*fn)(struct device *dev, void *data));
413 extern struct device *class_find_device(struct class *class,
414                                         struct device *start, const void *data,
415                                         int (*match)(struct device *, const void *));
416 
417 struct class_attribute {
418         struct attribute attr;
419         ssize_t (*show)(struct class *class, struct class_attribute *attr,
420                         char *buf);
421         ssize_t (*store)(struct class *class, struct class_attribute *attr,
422                         const char *buf, size_t count);
423 };
424 
425 #define CLASS_ATTR(_name, _mode, _show, _store) \
426         struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
427 #define CLASS_ATTR_RW(_name) \
428         struct class_attribute class_attr_##_name = __ATTR_RW(_name)
429 #define CLASS_ATTR_RO(_name) \
430         struct class_attribute class_attr_##_name = __ATTR_RO(_name)
431 
432 extern int __must_check class_create_file_ns(struct class *class,
433                                              const struct class_attribute *attr,
434                                              const void *ns);
435 extern void class_remove_file_ns(struct class *class,
436                                  const struct class_attribute *attr,
437                                  const void *ns);
438 
439 static inline int __must_check class_create_file(struct class *class,
440                                         const struct class_attribute *attr)
441 {
442         return class_create_file_ns(class, attr, NULL);
443 }
444 
445 static inline void class_remove_file(struct class *class,
446                                      const struct class_attribute *attr)
447 {
448         return class_remove_file_ns(class, attr, NULL);
449 }
450 
451 /* Simple class attribute that is just a static string */
452 struct class_attribute_string {
453         struct class_attribute attr;
454         char *str;
455 };
456 
457 /* Currently read-only only */
458 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
459         { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
460 #define CLASS_ATTR_STRING(_name, _mode, _str) \
461         struct class_attribute_string class_attr_##_name = \
462                 _CLASS_ATTR_STRING(_name, _mode, _str)
463 
464 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
465                         char *buf);
466 
467 struct class_interface {
468         struct list_head        node;
469         struct class            *class;
470 
471         int (*add_dev)          (struct device *, struct class_interface *);
472         void (*remove_dev)      (struct device *, struct class_interface *);
473 };
474 
475 extern int __must_check class_interface_register(struct class_interface *);
476 extern void class_interface_unregister(struct class_interface *);
477 
478 extern struct class * __must_check __class_create(struct module *owner,
479                                                   const char *name,
480                                                   struct lock_class_key *key);
481 extern void class_destroy(struct class *cls);
482 
483 /* This is a #define to keep the compiler from merging different
484  * instances of the __key variable */
485 #define class_create(owner, name)               \
486 ({                                              \
487         static struct lock_class_key __key;     \
488         __class_create(owner, name, &__key);    \
489 })
490 
491 /*
492  * The type of device, "struct device" is embedded in. A class
493  * or bus can contain devices of different types
494  * like "partitions" and "disks", "mouse" and "event".
495  * This identifies the device type and carries type-specific
496  * information, equivalent to the kobj_type of a kobject.
497  * If "name" is specified, the uevent will contain it in
498  * the DEVTYPE variable.
499  */
500 struct device_type {
501         const char *name;
502         const struct attribute_group **groups;
503         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
504         char *(*devnode)(struct device *dev, umode_t *mode,
505                          kuid_t *uid, kgid_t *gid);
506         void (*release)(struct device *dev);
507 
508         const struct dev_pm_ops *pm;
509 };
510 
511 /* interface for exporting device attributes */
512 struct device_attribute {
513         struct attribute        attr;
514         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
515                         char *buf);
516         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
517                          const char *buf, size_t count);
518 };
519 
520 struct dev_ext_attribute {
521         struct device_attribute attr;
522         void *var;
523 };
524 
525 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
526                           char *buf);
527 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
528                            const char *buf, size_t count);
529 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
530                         char *buf);
531 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
532                          const char *buf, size_t count);
533 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
534                         char *buf);
535 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
536                          const char *buf, size_t count);
537 
538 #define DEVICE_ATTR(_name, _mode, _show, _store) \
539         struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
540 #define DEVICE_ATTR_RW(_name) \
541         struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
542 #define DEVICE_ATTR_RO(_name) \
543         struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
544 #define DEVICE_ATTR_WO(_name) \
545         struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
546 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
547         struct dev_ext_attribute dev_attr_##_name = \
548                 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
549 #define DEVICE_INT_ATTR(_name, _mode, _var) \
550         struct dev_ext_attribute dev_attr_##_name = \
551                 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
552 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
553         struct dev_ext_attribute dev_attr_##_name = \
554                 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
555 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
556         struct device_attribute dev_attr_##_name =              \
557                 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
558 
559 extern int device_create_file(struct device *device,
560                               const struct device_attribute *entry);
561 extern void device_remove_file(struct device *dev,
562                                const struct device_attribute *attr);
563 extern bool device_remove_file_self(struct device *dev,
564                                     const struct device_attribute *attr);
565 extern int __must_check device_create_bin_file(struct device *dev,
566                                         const struct bin_attribute *attr);
567 extern void device_remove_bin_file(struct device *dev,
568                                    const struct bin_attribute *attr);
569 
570 /* device resource management */
571 typedef void (*dr_release_t)(struct device *dev, void *res);
572 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
573 
574 #ifdef CONFIG_DEBUG_DEVRES
575 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
576                              const char *name);
577 #define devres_alloc(release, size, gfp) \
578         __devres_alloc(release, size, gfp, #release)
579 #else
580 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
581 #endif
582 extern void devres_for_each_res(struct device *dev, dr_release_t release,
583                                 dr_match_t match, void *match_data,
584                                 void (*fn)(struct device *, void *, void *),
585                                 void *data);
586 extern void devres_free(void *res);
587 extern void devres_add(struct device *dev, void *res);
588 extern void *devres_find(struct device *dev, dr_release_t release,
589                          dr_match_t match, void *match_data);
590 extern void *devres_get(struct device *dev, void *new_res,
591                         dr_match_t match, void *match_data);
592 extern void *devres_remove(struct device *dev, dr_release_t release,
593                            dr_match_t match, void *match_data);
594 extern int devres_destroy(struct device *dev, dr_release_t release,
595                           dr_match_t match, void *match_data);
596 extern int devres_release(struct device *dev, dr_release_t release,
597                           dr_match_t match, void *match_data);
598 
599 /* devres group */
600 extern void * __must_check devres_open_group(struct device *dev, void *id,
601                                              gfp_t gfp);
602 extern void devres_close_group(struct device *dev, void *id);
603 extern void devres_remove_group(struct device *dev, void *id);
604 extern int devres_release_group(struct device *dev, void *id);
605 
606 /* managed devm_k.alloc/kfree for device drivers */
607 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp);
608 extern char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
609                              va_list ap);
610 extern char *devm_kasprintf(struct device *dev, gfp_t gfp,
611                             const char *fmt, ...);
612 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
613 {
614         return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
615 }
616 static inline void *devm_kmalloc_array(struct device *dev,
617                                        size_t n, size_t size, gfp_t flags)
618 {
619         if (size != 0 && n > SIZE_MAX / size)
620                 return NULL;
621         return devm_kmalloc(dev, n * size, flags);
622 }
623 static inline void *devm_kcalloc(struct device *dev,
624                                  size_t n, size_t size, gfp_t flags)
625 {
626         return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
627 }
628 extern void devm_kfree(struct device *dev, void *p);
629 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp);
630 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
631                           gfp_t gfp);
632 
633 extern unsigned long devm_get_free_pages(struct device *dev,
634                                          gfp_t gfp_mask, unsigned int order);
635 extern void devm_free_pages(struct device *dev, unsigned long addr);
636 
637 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
638 
639 /* allows to add/remove a custom action to devres stack */
640 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
641 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
642 
643 struct device_dma_parameters {
644         /*
645          * a low level driver may set these to teach IOMMU code about
646          * sg limitations.
647          */
648         unsigned int max_segment_size;
649         unsigned long segment_boundary_mask;
650 };
651 
652 struct acpi_device;
653 
654 struct acpi_dev_node {
655 #ifdef CONFIG_ACPI
656         struct acpi_device *companion;
657 #endif
658 };
659 
660 /**
661  * struct device - The basic device structure
662  * @parent:     The device's "parent" device, the device to which it is attached.
663  *              In most cases, a parent device is some sort of bus or host
664  *              controller. If parent is NULL, the device, is a top-level device,
665  *              which is not usually what you want.
666  * @p:          Holds the private data of the driver core portions of the device.
667  *              See the comment of the struct device_private for detail.
668  * @kobj:       A top-level, abstract class from which other classes are derived.
669  * @init_name:  Initial name of the device.
670  * @type:       The type of device.
671  *              This identifies the device type and carries type-specific
672  *              information.
673  * @mutex:      Mutex to synchronize calls to its driver.
674  * @bus:        Type of bus device is on.
675  * @driver:     Which driver has allocated this
676  * @platform_data: Platform data specific to the device.
677  *              Example: For devices on custom boards, as typical of embedded
678  *              and SOC based hardware, Linux often uses platform_data to point
679  *              to board-specific structures describing devices and how they
680  *              are wired.  That can include what ports are available, chip
681  *              variants, which GPIO pins act in what additional roles, and so
682  *              on.  This shrinks the "Board Support Packages" (BSPs) and
683  *              minimizes board-specific #ifdefs in drivers.
684  * @driver_data: Private pointer for driver specific info.
685  * @power:      For device power management.
686  *              See Documentation/power/devices.txt for details.
687  * @pm_domain:  Provide callbacks that are executed during system suspend,
688  *              hibernation, system resume and during runtime PM transitions
689  *              along with subsystem-level and driver-level callbacks.
690  * @pins:       For device pin management.
691  *              See Documentation/pinctrl.txt for details.
692  * @numa_node:  NUMA node this device is close to.
693  * @dma_mask:   Dma mask (if dma'ble device).
694  * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
695  *              hardware supports 64-bit addresses for consistent allocations
696  *              such descriptors.
697  * @dma_pfn_offset: offset of DMA memory range relatively of RAM
698  * @dma_parms:  A low level driver may set these to teach IOMMU code about
699  *              segment limitations.
700  * @dma_pools:  Dma pools (if dma'ble device).
701  * @dma_mem:    Internal for coherent mem override.
702  * @cma_area:   Contiguous memory area for dma allocations
703  * @archdata:   For arch-specific additions.
704  * @of_node:    Associated device tree node.
705  * @acpi_node:  Associated ACPI device node.
706  * @devt:       For creating the sysfs "dev".
707  * @id:         device instance
708  * @devres_lock: Spinlock to protect the resource of the device.
709  * @devres_head: The resources list of the device.
710  * @knode_class: The node used to add the device to the class list.
711  * @class:      The class of the device.
712  * @groups:     Optional attribute groups.
713  * @release:    Callback to free the device after all references have
714  *              gone away. This should be set by the allocator of the
715  *              device (i.e. the bus driver that discovered the device).
716  * @iommu_group: IOMMU group the device belongs to.
717  *
718  * @offline_disabled: If set, the device is permanently online.
719  * @offline:    Set after successful invocation of bus type's .offline().
720  *
721  * At the lowest level, every device in a Linux system is represented by an
722  * instance of struct device. The device structure contains the information
723  * that the device model core needs to model the system. Most subsystems,
724  * however, track additional information about the devices they host. As a
725  * result, it is rare for devices to be represented by bare device structures;
726  * instead, that structure, like kobject structures, is usually embedded within
727  * a higher-level representation of the device.
728  */
729 struct device {
730         struct device           *parent;
731 
732         struct device_private   *p;
733 
734         struct kobject kobj;
735         const char              *init_name; /* initial name of the device */
736         const struct device_type *type;
737 
738         struct mutex            mutex;  /* mutex to synchronize calls to
739                                          * its driver.
740                                          */
741 
742         struct bus_type *bus;           /* type of bus device is on */
743         struct device_driver *driver;   /* which driver has allocated this
744                                            device */
745         void            *platform_data; /* Platform specific data, device
746                                            core doesn't touch it */
747         void            *driver_data;   /* Driver data, set and get with
748                                            dev_set/get_drvdata */
749         struct dev_pm_info      power;
750         struct dev_pm_domain    *pm_domain;
751 
752 #ifdef CONFIG_PINCTRL
753         struct dev_pin_info     *pins;
754 #endif
755 
756 #ifdef CONFIG_NUMA
757         int             numa_node;      /* NUMA node this device is close to */
758 #endif
759         u64             *dma_mask;      /* dma mask (if dma'able device) */
760         u64             coherent_dma_mask;/* Like dma_mask, but for
761                                              alloc_coherent mappings as
762                                              not all hardware supports
763                                              64 bit addresses for consistent
764                                              allocations such descriptors. */
765         unsigned long   dma_pfn_offset;
766 
767         struct device_dma_parameters *dma_parms;
768 
769         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
770 
771         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
772                                              override */
773 #ifdef CONFIG_DMA_CMA
774         struct cma *cma_area;           /* contiguous memory area for dma
775                                            allocations */
776 #endif
777         /* arch specific additions */
778         struct dev_archdata     archdata;
779 
780         struct device_node      *of_node; /* associated device tree node */
781         struct acpi_dev_node    acpi_node; /* associated ACPI device node */
782 
783         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
784         u32                     id;     /* device instance */
785 
786         spinlock_t              devres_lock;
787         struct list_head        devres_head;
788 
789         struct klist_node       knode_class;
790         struct class            *class;
791         const struct attribute_group **groups;  /* optional groups */
792 
793         void    (*release)(struct device *dev);
794         struct iommu_group      *iommu_group;
795 
796         bool                    offline_disabled:1;
797         bool                    offline:1;
798 };
799 
800 static inline struct device *kobj_to_dev(struct kobject *kobj)
801 {
802         return container_of(kobj, struct device, kobj);
803 }
804 
805 /* Get the wakeup routines, which depend on struct device */
806 #include <linux/pm_wakeup.h>
807 
808 static inline const char *dev_name(const struct device *dev)
809 {
810         /* Use the init name until the kobject becomes available */
811         if (dev->init_name)
812                 return dev->init_name;
813 
814         return kobject_name(&dev->kobj);
815 }
816 
817 extern __printf(2, 3)
818 int dev_set_name(struct device *dev, const char *name, ...);
819 
820 #ifdef CONFIG_NUMA
821 static inline int dev_to_node(struct device *dev)
822 {
823         return dev->numa_node;
824 }
825 static inline void set_dev_node(struct device *dev, int node)
826 {
827         dev->numa_node = node;
828 }
829 #else
830 static inline int dev_to_node(struct device *dev)
831 {
832         return -1;
833 }
834 static inline void set_dev_node(struct device *dev, int node)
835 {
836 }
837 #endif
838 
839 static inline void *dev_get_drvdata(const struct device *dev)
840 {
841         return dev->driver_data;
842 }
843 
844 static inline void dev_set_drvdata(struct device *dev, void *data)
845 {
846         dev->driver_data = data;
847 }
848 
849 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
850 {
851         return dev ? dev->power.subsys_data : NULL;
852 }
853 
854 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
855 {
856         return dev->kobj.uevent_suppress;
857 }
858 
859 static inline void dev_set_uevent_suppress(struct device *dev, int val)
860 {
861         dev->kobj.uevent_suppress = val;
862 }
863 
864 static inline int device_is_registered(struct device *dev)
865 {
866         return dev->kobj.state_in_sysfs;
867 }
868 
869 static inline void device_enable_async_suspend(struct device *dev)
870 {
871         if (!dev->power.is_prepared)
872                 dev->power.async_suspend = true;
873 }
874 
875 static inline void device_disable_async_suspend(struct device *dev)
876 {
877         if (!dev->power.is_prepared)
878                 dev->power.async_suspend = false;
879 }
880 
881 static inline bool device_async_suspend_enabled(struct device *dev)
882 {
883         return !!dev->power.async_suspend;
884 }
885 
886 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
887 {
888         dev->power.ignore_children = enable;
889 }
890 
891 static inline void dev_pm_syscore_device(struct device *dev, bool val)
892 {
893 #ifdef CONFIG_PM_SLEEP
894         dev->power.syscore = val;
895 #endif
896 }
897 
898 static inline void device_lock(struct device *dev)
899 {
900         mutex_lock(&dev->mutex);
901 }
902 
903 static inline int device_trylock(struct device *dev)
904 {
905         return mutex_trylock(&dev->mutex);
906 }
907 
908 static inline void device_unlock(struct device *dev)
909 {
910         mutex_unlock(&dev->mutex);
911 }
912 
913 void driver_init(void);
914 
915 /*
916  * High level routines for use by the bus drivers
917  */
918 extern int __must_check device_register(struct device *dev);
919 extern void device_unregister(struct device *dev);
920 extern void device_initialize(struct device *dev);
921 extern int __must_check device_add(struct device *dev);
922 extern void device_del(struct device *dev);
923 extern int device_for_each_child(struct device *dev, void *data,
924                      int (*fn)(struct device *dev, void *data));
925 extern struct device *device_find_child(struct device *dev, void *data,
926                                 int (*match)(struct device *dev, void *data));
927 extern int device_rename(struct device *dev, const char *new_name);
928 extern int device_move(struct device *dev, struct device *new_parent,
929                        enum dpm_order dpm_order);
930 extern const char *device_get_devnode(struct device *dev,
931                                       umode_t *mode, kuid_t *uid, kgid_t *gid,
932                                       const char **tmp);
933 
934 static inline bool device_supports_offline(struct device *dev)
935 {
936         return dev->bus && dev->bus->offline && dev->bus->online;
937 }
938 
939 extern void lock_device_hotplug(void);
940 extern void unlock_device_hotplug(void);
941 extern int lock_device_hotplug_sysfs(void);
942 extern int device_offline(struct device *dev);
943 extern int device_online(struct device *dev);
944 /*
945  * Root device objects for grouping under /sys/devices
946  */
947 extern struct device *__root_device_register(const char *name,
948                                              struct module *owner);
949 
950 /* This is a macro to avoid include problems with THIS_MODULE */
951 #define root_device_register(name) \
952         __root_device_register(name, THIS_MODULE)
953 
954 extern void root_device_unregister(struct device *root);
955 
956 static inline void *dev_get_platdata(const struct device *dev)
957 {
958         return dev->platform_data;
959 }
960 
961 /*
962  * Manual binding of a device to driver. See drivers/base/bus.c
963  * for information on use.
964  */
965 extern int __must_check device_bind_driver(struct device *dev);
966 extern void device_release_driver(struct device *dev);
967 extern int  __must_check device_attach(struct device *dev);
968 extern int __must_check driver_attach(struct device_driver *drv);
969 extern int __must_check device_reprobe(struct device *dev);
970 
971 /*
972  * Easy functions for dynamically creating devices on the fly
973  */
974 extern struct device *device_create_vargs(struct class *cls,
975                                           struct device *parent,
976                                           dev_t devt,
977                                           void *drvdata,
978                                           const char *fmt,
979                                           va_list vargs);
980 extern __printf(5, 6)
981 struct device *device_create(struct class *cls, struct device *parent,
982                              dev_t devt, void *drvdata,
983                              const char *fmt, ...);
984 extern __printf(6, 7)
985 struct device *device_create_with_groups(struct class *cls,
986                              struct device *parent, dev_t devt, void *drvdata,
987                              const struct attribute_group **groups,
988                              const char *fmt, ...);
989 extern void device_destroy(struct class *cls, dev_t devt);
990 
991 /*
992  * Platform "fixup" functions - allow the platform to have their say
993  * about devices and actions that the general device layer doesn't
994  * know about.
995  */
996 /* Notify platform of device discovery */
997 extern int (*platform_notify)(struct device *dev);
998 
999 extern int (*platform_notify_remove)(struct device *dev);
1000 
1001 
1002 /*
1003  * get_device - atomically increment the reference count for the device.
1004  *
1005  */
1006 extern struct device *get_device(struct device *dev);
1007 extern void put_device(struct device *dev);
1008 
1009 #ifdef CONFIG_DEVTMPFS
1010 extern int devtmpfs_create_node(struct device *dev);
1011 extern int devtmpfs_delete_node(struct device *dev);
1012 extern int devtmpfs_mount(const char *mntdir);
1013 #else
1014 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1015 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1016 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1017 #endif
1018 
1019 /* drivers/base/power/shutdown.c */
1020 extern void device_shutdown(void);
1021 
1022 /* debugging and troubleshooting/diagnostic helpers. */
1023 extern const char *dev_driver_string(const struct device *dev);
1024 
1025 
1026 #ifdef CONFIG_PRINTK
1027 
1028 extern __printf(3, 0)
1029 int dev_vprintk_emit(int level, const struct device *dev,
1030                      const char *fmt, va_list args);
1031 extern __printf(3, 4)
1032 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1033 
1034 extern __printf(3, 4)
1035 int dev_printk(const char *level, const struct device *dev,
1036                const char *fmt, ...);
1037 extern __printf(2, 3)
1038 int dev_emerg(const struct device *dev, const char *fmt, ...);
1039 extern __printf(2, 3)
1040 int dev_alert(const struct device *dev, const char *fmt, ...);
1041 extern __printf(2, 3)
1042 int dev_crit(const struct device *dev, const char *fmt, ...);
1043 extern __printf(2, 3)
1044 int dev_err(const struct device *dev, const char *fmt, ...);
1045 extern __printf(2, 3)
1046 int dev_warn(const struct device *dev, const char *fmt, ...);
1047 extern __printf(2, 3)
1048 int dev_notice(const struct device *dev, const char *fmt, ...);
1049 extern __printf(2, 3)
1050 int _dev_info(const struct device *dev, const char *fmt, ...);
1051 
1052 #else
1053 
1054 static inline __printf(3, 0)
1055 int dev_vprintk_emit(int level, const struct device *dev,
1056                      const char *fmt, va_list args)
1057 { return 0; }
1058 static inline __printf(3, 4)
1059 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1060 { return 0; }
1061 
1062 static inline int __dev_printk(const char *level, const struct device *dev,
1063                                struct va_format *vaf)
1064 { return 0; }
1065 static inline __printf(3, 4)
1066 int dev_printk(const char *level, const struct device *dev,
1067                const char *fmt, ...)
1068 { return 0; }
1069 
1070 static inline __printf(2, 3)
1071 int dev_emerg(const struct device *dev, const char *fmt, ...)
1072 { return 0; }
1073 static inline __printf(2, 3)
1074 int dev_crit(const struct device *dev, const char *fmt, ...)
1075 { return 0; }
1076 static inline __printf(2, 3)
1077 int dev_alert(const struct device *dev, const char *fmt, ...)
1078 { return 0; }
1079 static inline __printf(2, 3)
1080 int dev_err(const struct device *dev, const char *fmt, ...)
1081 { return 0; }
1082 static inline __printf(2, 3)
1083 int dev_warn(const struct device *dev, const char *fmt, ...)
1084 { return 0; }
1085 static inline __printf(2, 3)
1086 int dev_notice(const struct device *dev, const char *fmt, ...)
1087 { return 0; }
1088 static inline __printf(2, 3)
1089 int _dev_info(const struct device *dev, const char *fmt, ...)
1090 { return 0; }
1091 
1092 #endif
1093 
1094 /*
1095  * Stupid hackaround for existing uses of non-printk uses dev_info
1096  *
1097  * Note that the definition of dev_info below is actually _dev_info
1098  * and a macro is used to avoid redefining dev_info
1099  */
1100 
1101 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1102 
1103 #if defined(CONFIG_DYNAMIC_DEBUG)
1104 #define dev_dbg(dev, format, ...)                    \
1105 do {                                                 \
1106         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1107 } while (0)
1108 #elif defined(DEBUG)
1109 #define dev_dbg(dev, format, arg...)            \
1110         dev_printk(KERN_DEBUG, dev, format, ##arg)
1111 #else
1112 #define dev_dbg(dev, format, arg...)                            \
1113 ({                                                              \
1114         if (0)                                                  \
1115                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
1116         0;                                                      \
1117 })
1118 #endif
1119 
1120 #define dev_level_ratelimited(dev_level, dev, fmt, ...)                 \
1121 do {                                                                    \
1122         static DEFINE_RATELIMIT_STATE(_rs,                              \
1123                                       DEFAULT_RATELIMIT_INTERVAL,       \
1124                                       DEFAULT_RATELIMIT_BURST);         \
1125         if (__ratelimit(&_rs))                                          \
1126                 dev_level(dev, fmt, ##__VA_ARGS__);                     \
1127 } while (0)
1128 
1129 #define dev_emerg_ratelimited(dev, fmt, ...)                            \
1130         dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1131 #define dev_alert_ratelimited(dev, fmt, ...)                            \
1132         dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1133 #define dev_crit_ratelimited(dev, fmt, ...)                             \
1134         dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1135 #define dev_err_ratelimited(dev, fmt, ...)                              \
1136         dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1137 #define dev_warn_ratelimited(dev, fmt, ...)                             \
1138         dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1139 #define dev_notice_ratelimited(dev, fmt, ...)                           \
1140         dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1141 #define dev_info_ratelimited(dev, fmt, ...)                             \
1142         dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1143 #if defined(CONFIG_DYNAMIC_DEBUG)
1144 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1145 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1146 do {                                                                    \
1147         static DEFINE_RATELIMIT_STATE(_rs,                              \
1148                                       DEFAULT_RATELIMIT_INTERVAL,       \
1149                                       DEFAULT_RATELIMIT_BURST);         \
1150         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
1151         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
1152             __ratelimit(&_rs))                                          \
1153                 __dynamic_dev_dbg(&descriptor, dev, fmt,                \
1154                                   ##__VA_ARGS__);                       \
1155 } while (0)
1156 #elif defined(DEBUG)
1157 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1158 do {                                                                    \
1159         static DEFINE_RATELIMIT_STATE(_rs,                              \
1160                                       DEFAULT_RATELIMIT_INTERVAL,       \
1161                                       DEFAULT_RATELIMIT_BURST);         \
1162         if (__ratelimit(&_rs))                                          \
1163                 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__);        \
1164 } while (0)
1165 #else
1166 #define dev_dbg_ratelimited(dev, fmt, ...)                      \
1167         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
1168 #endif
1169 
1170 #ifdef VERBOSE_DEBUG
1171 #define dev_vdbg        dev_dbg
1172 #else
1173 #define dev_vdbg(dev, format, arg...)                           \
1174 ({                                                              \
1175         if (0)                                                  \
1176                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
1177         0;                                                      \
1178 })
1179 #endif
1180 
1181 /*
1182  * dev_WARN*() acts like dev_printk(), but with the key difference of
1183  * using WARN/WARN_ONCE to include file/line information and a backtrace.
1184  */
1185 #define dev_WARN(dev, format, arg...) \
1186         WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1187 
1188 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1189         WARN_ONCE(condition, "%s %s: " format, \
1190                         dev_driver_string(dev), dev_name(dev), ## arg)
1191 
1192 /* Create alias, so I can be autoloaded. */
1193 #define MODULE_ALIAS_CHARDEV(major,minor) \
1194         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1195 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1196         MODULE_ALIAS("char-major-" __stringify(major) "-*")
1197 
1198 #ifdef CONFIG_SYSFS_DEPRECATED
1199 extern long sysfs_deprecated;
1200 #else
1201 #define sysfs_deprecated 0
1202 #endif
1203 
1204 /**
1205  * module_driver() - Helper macro for drivers that don't do anything
1206  * special in module init/exit. This eliminates a lot of boilerplate.
1207  * Each module may only use this macro once, and calling it replaces
1208  * module_init() and module_exit().
1209  *
1210  * @__driver: driver name
1211  * @__register: register function for this driver type
1212  * @__unregister: unregister function for this driver type
1213  * @...: Additional arguments to be passed to __register and __unregister.
1214  *
1215  * Use this macro to construct bus specific macros for registering
1216  * drivers, and do not use it on its own.
1217  */
1218 #define module_driver(__driver, __register, __unregister, ...) \
1219 static int __init __driver##_init(void) \
1220 { \
1221         return __register(&(__driver) , ##__VA_ARGS__); \
1222 } \
1223 module_init(__driver##_init); \
1224 static void __exit __driver##_exit(void) \
1225 { \
1226         __unregister(&(__driver) , ##__VA_ARGS__); \
1227 } \
1228 module_exit(__driver##_exit);
1229 
1230 #endif /* _DEVICE_H_ */
1231 

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