Version:  2.0.40 2.2.26 2.4.37 3.0 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

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

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