Version:  2.0.40 2.2.26 2.4.37 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 3.18

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 to be removed */
185 #define BUS_NOTIFY_REMOVED_DEVICE       0x00000003 /* device removed */
186 #define BUS_NOTIFY_BIND_DRIVER          0x00000004 /* driver about to be
187                                                       bound */
188 #define BUS_NOTIFY_BOUND_DRIVER         0x00000005 /* driver bound to device */
189 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000006 /* driver about to be
190                                                       unbound */
191 #define BUS_NOTIFY_UNBOUND_DRIVER       0x00000007 /* driver is unbound
192                                                       from the device */
193 
194 extern struct kset *bus_get_kset(struct bus_type *bus);
195 extern struct klist *bus_get_device_klist(struct bus_type *bus);
196 
197 /**
198  * struct device_driver - The basic device driver structure
199  * @name:       Name of the device driver.
200  * @bus:        The bus which the device of this driver belongs to.
201  * @owner:      The module owner.
202  * @mod_name:   Used for built-in modules.
203  * @suppress_bind_attrs: Disables bind/unbind via sysfs.
204  * @of_match_table: The open firmware table.
205  * @acpi_match_table: The ACPI match table.
206  * @probe:      Called to query the existence of a specific device,
207  *              whether this driver can work with it, and bind the driver
208  *              to a specific device.
209  * @remove:     Called when the device is removed from the system to
210  *              unbind a device from this driver.
211  * @shutdown:   Called at shut-down time to quiesce the device.
212  * @suspend:    Called to put the device to sleep mode. Usually to a
213  *              low power state.
214  * @resume:     Called to bring a device from sleep mode.
215  * @groups:     Default attributes that get created by the driver core
216  *              automatically.
217  * @pm:         Power management operations of the device which matched
218  *              this driver.
219  * @p:          Driver core's private data, no one other than the driver
220  *              core can touch this.
221  *
222  * The device driver-model tracks all of the drivers known to the system.
223  * The main reason for this tracking is to enable the driver core to match
224  * up drivers with new devices. Once drivers are known objects within the
225  * system, however, a number of other things become possible. Device drivers
226  * can export information and configuration variables that are independent
227  * of any specific device.
228  */
229 struct device_driver {
230         const char              *name;
231         struct bus_type         *bus;
232 
233         struct module           *owner;
234         const char              *mod_name;      /* used for built-in modules */
235 
236         bool suppress_bind_attrs;       /* disables bind/unbind via sysfs */
237 
238         const struct of_device_id       *of_match_table;
239         const struct acpi_device_id     *acpi_match_table;
240 
241         int (*probe) (struct device *dev);
242         int (*remove) (struct device *dev);
243         void (*shutdown) (struct device *dev);
244         int (*suspend) (struct device *dev, pm_message_t state);
245         int (*resume) (struct device *dev);
246         const struct attribute_group **groups;
247 
248         const struct dev_pm_ops *pm;
249 
250         struct driver_private *p;
251 };
252 
253 
254 extern int __must_check driver_register(struct device_driver *drv);
255 extern void driver_unregister(struct device_driver *drv);
256 
257 extern struct device_driver *driver_find(const char *name,
258                                          struct bus_type *bus);
259 extern int driver_probe_done(void);
260 extern void wait_for_device_probe(void);
261 
262 
263 /* sysfs interface for exporting driver attributes */
264 
265 struct driver_attribute {
266         struct attribute attr;
267         ssize_t (*show)(struct device_driver *driver, char *buf);
268         ssize_t (*store)(struct device_driver *driver, const char *buf,
269                          size_t count);
270 };
271 
272 #define DRIVER_ATTR(_name, _mode, _show, _store) \
273         struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store)
274 #define DRIVER_ATTR_RW(_name) \
275         struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
276 #define DRIVER_ATTR_RO(_name) \
277         struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
278 #define DRIVER_ATTR_WO(_name) \
279         struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
280 
281 extern int __must_check driver_create_file(struct device_driver *driver,
282                                         const struct driver_attribute *attr);
283 extern void driver_remove_file(struct device_driver *driver,
284                                const struct driver_attribute *attr);
285 
286 extern int __must_check driver_for_each_device(struct device_driver *drv,
287                                                struct device *start,
288                                                void *data,
289                                                int (*fn)(struct device *dev,
290                                                          void *));
291 struct device *driver_find_device(struct device_driver *drv,
292                                   struct device *start, void *data,
293                                   int (*match)(struct device *dev, void *data));
294 
295 /**
296  * struct subsys_interface - interfaces to device functions
297  * @name:       name of the device function
298  * @subsys:     subsytem of the devices to attach to
299  * @node:       the list of functions registered at the subsystem
300  * @add_dev:    device hookup to device function handler
301  * @remove_dev: device hookup to device function handler
302  *
303  * Simple interfaces attached to a subsystem. Multiple interfaces can
304  * attach to a subsystem and its devices. Unlike drivers, they do not
305  * exclusively claim or control devices. Interfaces usually represent
306  * a specific functionality of a subsystem/class of devices.
307  */
308 struct subsys_interface {
309         const char *name;
310         struct bus_type *subsys;
311         struct list_head node;
312         int (*add_dev)(struct device *dev, struct subsys_interface *sif);
313         int (*remove_dev)(struct device *dev, struct subsys_interface *sif);
314 };
315 
316 int subsys_interface_register(struct subsys_interface *sif);
317 void subsys_interface_unregister(struct subsys_interface *sif);
318 
319 int subsys_system_register(struct bus_type *subsys,
320                            const struct attribute_group **groups);
321 int subsys_virtual_register(struct bus_type *subsys,
322                             const struct attribute_group **groups);
323 
324 /**
325  * struct class - device classes
326  * @name:       Name of the class.
327  * @owner:      The module owner.
328  * @class_attrs: Default attributes of this class.
329  * @dev_groups: Default attributes of the devices that belong to the class.
330  * @dev_kobj:   The kobject that represents this class and links it into the hierarchy.
331  * @dev_uevent: Called when a device is added, removed from this class, or a
332  *              few other things that generate uevents to add the environment
333  *              variables.
334  * @devnode:    Callback to provide the devtmpfs.
335  * @class_release: Called to release this class.
336  * @dev_release: Called to release the device.
337  * @suspend:    Used to put the device to sleep mode, usually to a low power
338  *              state.
339  * @resume:     Used to bring the device from the sleep mode.
340  * @ns_type:    Callbacks so sysfs can detemine namespaces.
341  * @namespace:  Namespace of the device belongs to this class.
342  * @pm:         The default device power management operations of this class.
343  * @p:          The private data of the driver core, no one other than the
344  *              driver core can touch this.
345  *
346  * A class is a higher-level view of a device that abstracts out low-level
347  * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
348  * at the class level, they are all simply disks. Classes allow user space
349  * to work with devices based on what they do, rather than how they are
350  * connected or how they work.
351  */
352 struct class {
353         const char              *name;
354         struct module           *owner;
355 
356         struct class_attribute          *class_attrs;
357         const struct attribute_group    **dev_groups;
358         struct kobject                  *dev_kobj;
359 
360         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
361         char *(*devnode)(struct device *dev, umode_t *mode);
362 
363         void (*class_release)(struct class *class);
364         void (*dev_release)(struct device *dev);
365 
366         int (*suspend)(struct device *dev, pm_message_t state);
367         int (*resume)(struct device *dev);
368 
369         const struct kobj_ns_type_operations *ns_type;
370         const void *(*namespace)(struct device *dev);
371 
372         const struct dev_pm_ops *pm;
373 
374         struct subsys_private *p;
375 };
376 
377 struct class_dev_iter {
378         struct klist_iter               ki;
379         const struct device_type        *type;
380 };
381 
382 extern struct kobject *sysfs_dev_block_kobj;
383 extern struct kobject *sysfs_dev_char_kobj;
384 extern int __must_check __class_register(struct class *class,
385                                          struct lock_class_key *key);
386 extern void class_unregister(struct class *class);
387 
388 /* This is a #define to keep the compiler from merging different
389  * instances of the __key variable */
390 #define class_register(class)                   \
391 ({                                              \
392         static struct lock_class_key __key;     \
393         __class_register(class, &__key);        \
394 })
395 
396 struct class_compat;
397 struct class_compat *class_compat_register(const char *name);
398 void class_compat_unregister(struct class_compat *cls);
399 int class_compat_create_link(struct class_compat *cls, struct device *dev,
400                              struct device *device_link);
401 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
402                               struct device *device_link);
403 
404 extern void class_dev_iter_init(struct class_dev_iter *iter,
405                                 struct class *class,
406                                 struct device *start,
407                                 const struct device_type *type);
408 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
409 extern void class_dev_iter_exit(struct class_dev_iter *iter);
410 
411 extern int class_for_each_device(struct class *class, struct device *start,
412                                  void *data,
413                                  int (*fn)(struct device *dev, void *data));
414 extern struct device *class_find_device(struct class *class,
415                                         struct device *start, const void *data,
416                                         int (*match)(struct device *, const void *));
417 
418 struct class_attribute {
419         struct attribute attr;
420         ssize_t (*show)(struct class *class, struct class_attribute *attr,
421                         char *buf);
422         ssize_t (*store)(struct class *class, struct class_attribute *attr,
423                         const char *buf, size_t count);
424 };
425 
426 #define CLASS_ATTR(_name, _mode, _show, _store) \
427         struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
428 #define CLASS_ATTR_RW(_name) \
429         struct class_attribute class_attr_##_name = __ATTR_RW(_name)
430 #define CLASS_ATTR_RO(_name) \
431         struct class_attribute class_attr_##_name = __ATTR_RO(_name)
432 
433 extern int __must_check class_create_file_ns(struct class *class,
434                                              const struct class_attribute *attr,
435                                              const void *ns);
436 extern void class_remove_file_ns(struct class *class,
437                                  const struct class_attribute *attr,
438                                  const void *ns);
439 
440 static inline int __must_check class_create_file(struct class *class,
441                                         const struct class_attribute *attr)
442 {
443         return class_create_file_ns(class, attr, NULL);
444 }
445 
446 static inline void class_remove_file(struct class *class,
447                                      const struct class_attribute *attr)
448 {
449         return class_remove_file_ns(class, attr, NULL);
450 }
451 
452 /* Simple class attribute that is just a static string */
453 struct class_attribute_string {
454         struct class_attribute attr;
455         char *str;
456 };
457 
458 /* Currently read-only only */
459 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
460         { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
461 #define CLASS_ATTR_STRING(_name, _mode, _str) \
462         struct class_attribute_string class_attr_##_name = \
463                 _CLASS_ATTR_STRING(_name, _mode, _str)
464 
465 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
466                         char *buf);
467 
468 struct class_interface {
469         struct list_head        node;
470         struct class            *class;
471 
472         int (*add_dev)          (struct device *, struct class_interface *);
473         void (*remove_dev)      (struct device *, struct class_interface *);
474 };
475 
476 extern int __must_check class_interface_register(struct class_interface *);
477 extern void class_interface_unregister(struct class_interface *);
478 
479 extern struct class * __must_check __class_create(struct module *owner,
480                                                   const char *name,
481                                                   struct lock_class_key *key);
482 extern void class_destroy(struct class *cls);
483 
484 /* This is a #define to keep the compiler from merging different
485  * instances of the __key variable */
486 #define class_create(owner, name)               \
487 ({                                              \
488         static struct lock_class_key __key;     \
489         __class_create(owner, name, &__key);    \
490 })
491 
492 /*
493  * The type of device, "struct device" is embedded in. A class
494  * or bus can contain devices of different types
495  * like "partitions" and "disks", "mouse" and "event".
496  * This identifies the device type and carries type-specific
497  * information, equivalent to the kobj_type of a kobject.
498  * If "name" is specified, the uevent will contain it in
499  * the DEVTYPE variable.
500  */
501 struct device_type {
502         const char *name;
503         const struct attribute_group **groups;
504         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
505         char *(*devnode)(struct device *dev, umode_t *mode,
506                          kuid_t *uid, kgid_t *gid);
507         void (*release)(struct device *dev);
508 
509         const struct dev_pm_ops *pm;
510 };
511 
512 /* interface for exporting device attributes */
513 struct device_attribute {
514         struct attribute        attr;
515         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
516                         char *buf);
517         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
518                          const char *buf, size_t count);
519 };
520 
521 struct dev_ext_attribute {
522         struct device_attribute attr;
523         void *var;
524 };
525 
526 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
527                           char *buf);
528 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
529                            const char *buf, size_t count);
530 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
531                         char *buf);
532 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
533                          const char *buf, size_t count);
534 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
535                         char *buf);
536 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
537                          const char *buf, size_t count);
538 
539 #define DEVICE_ATTR(_name, _mode, _show, _store) \
540         struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
541 #define DEVICE_ATTR_RW(_name) \
542         struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
543 #define DEVICE_ATTR_RO(_name) \
544         struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
545 #define DEVICE_ATTR_WO(_name) \
546         struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
547 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
548         struct dev_ext_attribute dev_attr_##_name = \
549                 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
550 #define DEVICE_INT_ATTR(_name, _mode, _var) \
551         struct dev_ext_attribute dev_attr_##_name = \
552                 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
553 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
554         struct dev_ext_attribute dev_attr_##_name = \
555                 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
556 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
557         struct device_attribute dev_attr_##_name =              \
558                 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
559 
560 extern int device_create_file(struct device *device,
561                               const struct device_attribute *entry);
562 extern void device_remove_file(struct device *dev,
563                                const struct device_attribute *attr);
564 extern bool device_remove_file_self(struct device *dev,
565                                     const struct device_attribute *attr);
566 extern int __must_check device_create_bin_file(struct device *dev,
567                                         const struct bin_attribute *attr);
568 extern void device_remove_bin_file(struct device *dev,
569                                    const struct bin_attribute *attr);
570 
571 /* device resource management */
572 typedef void (*dr_release_t)(struct device *dev, void *res);
573 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
574 
575 #ifdef CONFIG_DEBUG_DEVRES
576 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
577                              const char *name);
578 #define devres_alloc(release, size, gfp) \
579         __devres_alloc(release, size, gfp, #release)
580 #else
581 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
582 #endif
583 extern void devres_for_each_res(struct device *dev, dr_release_t release,
584                                 dr_match_t match, void *match_data,
585                                 void (*fn)(struct device *, void *, void *),
586                                 void *data);
587 extern void devres_free(void *res);
588 extern void devres_add(struct device *dev, void *res);
589 extern void *devres_find(struct device *dev, dr_release_t release,
590                          dr_match_t match, void *match_data);
591 extern void *devres_get(struct device *dev, void *new_res,
592                         dr_match_t match, void *match_data);
593 extern void *devres_remove(struct device *dev, dr_release_t release,
594                            dr_match_t match, void *match_data);
595 extern int devres_destroy(struct device *dev, dr_release_t release,
596                           dr_match_t match, void *match_data);
597 extern int devres_release(struct device *dev, dr_release_t release,
598                           dr_match_t match, void *match_data);
599 
600 /* devres group */
601 extern void * __must_check devres_open_group(struct device *dev, void *id,
602                                              gfp_t gfp);
603 extern void devres_close_group(struct device *dev, void *id);
604 extern void devres_remove_group(struct device *dev, void *id);
605 extern int devres_release_group(struct device *dev, void *id);
606 
607 /* managed devm_k.alloc/kfree for device drivers */
608 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp);
609 extern char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
610                              va_list ap);
611 extern __printf(3, 4)
612 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...);
613 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
614 {
615         return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
616 }
617 static inline void *devm_kmalloc_array(struct device *dev,
618                                        size_t n, size_t size, gfp_t flags)
619 {
620         if (size != 0 && n > SIZE_MAX / size)
621                 return NULL;
622         return devm_kmalloc(dev, n * size, flags);
623 }
624 static inline void *devm_kcalloc(struct device *dev,
625                                  size_t n, size_t size, gfp_t flags)
626 {
627         return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
628 }
629 extern void devm_kfree(struct device *dev, void *p);
630 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp);
631 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
632                           gfp_t gfp);
633 
634 extern unsigned long devm_get_free_pages(struct device *dev,
635                                          gfp_t gfp_mask, unsigned int order);
636 extern void devm_free_pages(struct device *dev, unsigned long addr);
637 
638 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
639 
640 /* allows to add/remove a custom action to devres stack */
641 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
642 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
643 
644 struct device_dma_parameters {
645         /*
646          * a low level driver may set these to teach IOMMU code about
647          * sg limitations.
648          */
649         unsigned int max_segment_size;
650         unsigned long segment_boundary_mask;
651 };
652 
653 struct acpi_device;
654 
655 struct acpi_dev_node {
656 #ifdef CONFIG_ACPI
657         struct acpi_device *companion;
658 #endif
659 };
660 
661 /**
662  * struct device - The basic device structure
663  * @parent:     The device's "parent" device, the device to which it is attached.
664  *              In most cases, a parent device is some sort of bus or host
665  *              controller. If parent is NULL, the device, is a top-level device,
666  *              which is not usually what you want.
667  * @p:          Holds the private data of the driver core portions of the device.
668  *              See the comment of the struct device_private for detail.
669  * @kobj:       A top-level, abstract class from which other classes are derived.
670  * @init_name:  Initial name of the device.
671  * @type:       The type of device.
672  *              This identifies the device type and carries type-specific
673  *              information.
674  * @mutex:      Mutex to synchronize calls to its driver.
675  * @bus:        Type of bus device is on.
676  * @driver:     Which driver has allocated this
677  * @platform_data: Platform data specific to the device.
678  *              Example: For devices on custom boards, as typical of embedded
679  *              and SOC based hardware, Linux often uses platform_data to point
680  *              to board-specific structures describing devices and how they
681  *              are wired.  That can include what ports are available, chip
682  *              variants, which GPIO pins act in what additional roles, and so
683  *              on.  This shrinks the "Board Support Packages" (BSPs) and
684  *              minimizes board-specific #ifdefs in drivers.
685  * @driver_data: Private pointer for driver specific info.
686  * @power:      For device power management.
687  *              See Documentation/power/devices.txt for details.
688  * @pm_domain:  Provide callbacks that are executed during system suspend,
689  *              hibernation, system resume and during runtime PM transitions
690  *              along with subsystem-level and driver-level callbacks.
691  * @pins:       For device pin management.
692  *              See Documentation/pinctrl.txt for details.
693  * @numa_node:  NUMA node this device is close to.
694  * @dma_mask:   Dma mask (if dma'ble device).
695  * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
696  *              hardware supports 64-bit addresses for consistent allocations
697  *              such descriptors.
698  * @dma_pfn_offset: offset of DMA memory range relatively of RAM
699  * @dma_parms:  A low level driver may set these to teach IOMMU code about
700  *              segment limitations.
701  * @dma_pools:  Dma pools (if dma'ble device).
702  * @dma_mem:    Internal for coherent mem override.
703  * @cma_area:   Contiguous memory area for dma allocations
704  * @archdata:   For arch-specific additions.
705  * @of_node:    Associated device tree node.
706  * @acpi_node:  Associated ACPI device node.
707  * @devt:       For creating the sysfs "dev".
708  * @id:         device instance
709  * @devres_lock: Spinlock to protect the resource of the device.
710  * @devres_head: The resources list of the device.
711  * @knode_class: The node used to add the device to the class list.
712  * @class:      The class of the device.
713  * @groups:     Optional attribute groups.
714  * @release:    Callback to free the device after all references have
715  *              gone away. This should be set by the allocator of the
716  *              device (i.e. the bus driver that discovered the device).
717  * @iommu_group: IOMMU group the device belongs to.
718  *
719  * @offline_disabled: If set, the device is permanently online.
720  * @offline:    Set after successful invocation of bus type's .offline().
721  *
722  * At the lowest level, every device in a Linux system is represented by an
723  * instance of struct device. The device structure contains the information
724  * that the device model core needs to model the system. Most subsystems,
725  * however, track additional information about the devices they host. As a
726  * result, it is rare for devices to be represented by bare device structures;
727  * instead, that structure, like kobject structures, is usually embedded within
728  * a higher-level representation of the device.
729  */
730 struct device {
731         struct device           *parent;
732 
733         struct device_private   *p;
734 
735         struct kobject kobj;
736         const char              *init_name; /* initial name of the device */
737         const struct device_type *type;
738 
739         struct mutex            mutex;  /* mutex to synchronize calls to
740                                          * its driver.
741                                          */
742 
743         struct bus_type *bus;           /* type of bus device is on */
744         struct device_driver *driver;   /* which driver has allocated this
745                                            device */
746         void            *platform_data; /* Platform specific data, device
747                                            core doesn't touch it */
748         void            *driver_data;   /* Driver data, set and get with
749                                            dev_set/get_drvdata */
750         struct dev_pm_info      power;
751         struct dev_pm_domain    *pm_domain;
752 
753 #ifdef CONFIG_PINCTRL
754         struct dev_pin_info     *pins;
755 #endif
756 
757 #ifdef CONFIG_NUMA
758         int             numa_node;      /* NUMA node this device is close to */
759 #endif
760         u64             *dma_mask;      /* dma mask (if dma'able device) */
761         u64             coherent_dma_mask;/* Like dma_mask, but for
762                                              alloc_coherent mappings as
763                                              not all hardware supports
764                                              64 bit addresses for consistent
765                                              allocations such descriptors. */
766         unsigned long   dma_pfn_offset;
767 
768         struct device_dma_parameters *dma_parms;
769 
770         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
771 
772         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
773                                              override */
774 #ifdef CONFIG_DMA_CMA
775         struct cma *cma_area;           /* contiguous memory area for dma
776                                            allocations */
777 #endif
778         /* arch specific additions */
779         struct dev_archdata     archdata;
780 
781         struct device_node      *of_node; /* associated device tree node */
782         struct acpi_dev_node    acpi_node; /* associated ACPI device node */
783 
784         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
785         u32                     id;     /* device instance */
786 
787         spinlock_t              devres_lock;
788         struct list_head        devres_head;
789 
790         struct klist_node       knode_class;
791         struct class            *class;
792         const struct attribute_group **groups;  /* optional groups */
793 
794         void    (*release)(struct device *dev);
795         struct iommu_group      *iommu_group;
796 
797         bool                    offline_disabled:1;
798         bool                    offline:1;
799 };
800 
801 static inline struct device *kobj_to_dev(struct kobject *kobj)
802 {
803         return container_of(kobj, struct device, kobj);
804 }
805 
806 /* Get the wakeup routines, which depend on struct device */
807 #include <linux/pm_wakeup.h>
808 
809 static inline const char *dev_name(const struct device *dev)
810 {
811         /* Use the init name until the kobject becomes available */
812         if (dev->init_name)
813                 return dev->init_name;
814 
815         return kobject_name(&dev->kobj);
816 }
817 
818 extern __printf(2, 3)
819 int dev_set_name(struct device *dev, const char *name, ...);
820 
821 #ifdef CONFIG_NUMA
822 static inline int dev_to_node(struct device *dev)
823 {
824         return dev->numa_node;
825 }
826 static inline void set_dev_node(struct device *dev, int node)
827 {
828         dev->numa_node = node;
829 }
830 #else
831 static inline int dev_to_node(struct device *dev)
832 {
833         return -1;
834 }
835 static inline void set_dev_node(struct device *dev, int node)
836 {
837 }
838 #endif
839 
840 static inline void *dev_get_drvdata(const struct device *dev)
841 {
842         return dev->driver_data;
843 }
844 
845 static inline void dev_set_drvdata(struct device *dev, void *data)
846 {
847         dev->driver_data = data;
848 }
849 
850 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
851 {
852         return dev ? dev->power.subsys_data : NULL;
853 }
854 
855 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
856 {
857         return dev->kobj.uevent_suppress;
858 }
859 
860 static inline void dev_set_uevent_suppress(struct device *dev, int val)
861 {
862         dev->kobj.uevent_suppress = val;
863 }
864 
865 static inline int device_is_registered(struct device *dev)
866 {
867         return dev->kobj.state_in_sysfs;
868 }
869 
870 static inline void device_enable_async_suspend(struct device *dev)
871 {
872         if (!dev->power.is_prepared)
873                 dev->power.async_suspend = true;
874 }
875 
876 static inline void device_disable_async_suspend(struct device *dev)
877 {
878         if (!dev->power.is_prepared)
879                 dev->power.async_suspend = false;
880 }
881 
882 static inline bool device_async_suspend_enabled(struct device *dev)
883 {
884         return !!dev->power.async_suspend;
885 }
886 
887 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
888 {
889         dev->power.ignore_children = enable;
890 }
891 
892 static inline void dev_pm_syscore_device(struct device *dev, bool val)
893 {
894 #ifdef CONFIG_PM_SLEEP
895         dev->power.syscore = val;
896 #endif
897 }
898 
899 static inline void device_lock(struct device *dev)
900 {
901         mutex_lock(&dev->mutex);
902 }
903 
904 static inline int device_trylock(struct device *dev)
905 {
906         return mutex_trylock(&dev->mutex);
907 }
908 
909 static inline void device_unlock(struct device *dev)
910 {
911         mutex_unlock(&dev->mutex);
912 }
913 
914 void driver_init(void);
915 
916 /*
917  * High level routines for use by the bus drivers
918  */
919 extern int __must_check device_register(struct device *dev);
920 extern void device_unregister(struct device *dev);
921 extern void device_initialize(struct device *dev);
922 extern int __must_check device_add(struct device *dev);
923 extern void device_del(struct device *dev);
924 extern int device_for_each_child(struct device *dev, void *data,
925                      int (*fn)(struct device *dev, void *data));
926 extern struct device *device_find_child(struct device *dev, void *data,
927                                 int (*match)(struct device *dev, void *data));
928 extern int device_rename(struct device *dev, const char *new_name);
929 extern int device_move(struct device *dev, struct device *new_parent,
930                        enum dpm_order dpm_order);
931 extern const char *device_get_devnode(struct device *dev,
932                                       umode_t *mode, kuid_t *uid, kgid_t *gid,
933                                       const char **tmp);
934 
935 static inline bool device_supports_offline(struct device *dev)
936 {
937         return dev->bus && dev->bus->offline && dev->bus->online;
938 }
939 
940 extern void lock_device_hotplug(void);
941 extern void unlock_device_hotplug(void);
942 extern int lock_device_hotplug_sysfs(void);
943 extern int device_offline(struct device *dev);
944 extern int device_online(struct device *dev);
945 /*
946  * Root device objects for grouping under /sys/devices
947  */
948 extern struct device *__root_device_register(const char *name,
949                                              struct module *owner);
950 
951 /* This is a macro to avoid include problems with THIS_MODULE */
952 #define root_device_register(name) \
953         __root_device_register(name, THIS_MODULE)
954 
955 extern void root_device_unregister(struct device *root);
956 
957 static inline void *dev_get_platdata(const struct device *dev)
958 {
959         return dev->platform_data;
960 }
961 
962 /*
963  * Manual binding of a device to driver. See drivers/base/bus.c
964  * for information on use.
965  */
966 extern int __must_check device_bind_driver(struct device *dev);
967 extern void device_release_driver(struct device *dev);
968 extern int  __must_check device_attach(struct device *dev);
969 extern int __must_check driver_attach(struct device_driver *drv);
970 extern int __must_check device_reprobe(struct device *dev);
971 
972 /*
973  * Easy functions for dynamically creating devices on the fly
974  */
975 extern struct device *device_create_vargs(struct class *cls,
976                                           struct device *parent,
977                                           dev_t devt,
978                                           void *drvdata,
979                                           const char *fmt,
980                                           va_list vargs);
981 extern __printf(5, 6)
982 struct device *device_create(struct class *cls, struct device *parent,
983                              dev_t devt, void *drvdata,
984                              const char *fmt, ...);
985 extern __printf(6, 7)
986 struct device *device_create_with_groups(struct class *cls,
987                              struct device *parent, dev_t devt, void *drvdata,
988                              const struct attribute_group **groups,
989                              const char *fmt, ...);
990 extern void device_destroy(struct class *cls, dev_t devt);
991 
992 /*
993  * Platform "fixup" functions - allow the platform to have their say
994  * about devices and actions that the general device layer doesn't
995  * know about.
996  */
997 /* Notify platform of device discovery */
998 extern int (*platform_notify)(struct device *dev);
999 
1000 extern int (*platform_notify_remove)(struct device *dev);
1001 
1002 
1003 /*
1004  * get_device - atomically increment the reference count for the device.
1005  *
1006  */
1007 extern struct device *get_device(struct device *dev);
1008 extern void put_device(struct device *dev);
1009 
1010 #ifdef CONFIG_DEVTMPFS
1011 extern int devtmpfs_create_node(struct device *dev);
1012 extern int devtmpfs_delete_node(struct device *dev);
1013 extern int devtmpfs_mount(const char *mntdir);
1014 #else
1015 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1016 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1017 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1018 #endif
1019 
1020 /* drivers/base/power/shutdown.c */
1021 extern void device_shutdown(void);
1022 
1023 /* debugging and troubleshooting/diagnostic helpers. */
1024 extern const char *dev_driver_string(const struct device *dev);
1025 
1026 
1027 #ifdef CONFIG_PRINTK
1028 
1029 extern __printf(3, 0)
1030 int dev_vprintk_emit(int level, const struct device *dev,
1031                      const char *fmt, va_list args);
1032 extern __printf(3, 4)
1033 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1034 
1035 extern __printf(3, 4)
1036 int dev_printk(const char *level, const struct device *dev,
1037                const char *fmt, ...);
1038 extern __printf(2, 3)
1039 int dev_emerg(const struct device *dev, const char *fmt, ...);
1040 extern __printf(2, 3)
1041 int dev_alert(const struct device *dev, const char *fmt, ...);
1042 extern __printf(2, 3)
1043 int dev_crit(const struct device *dev, const char *fmt, ...);
1044 extern __printf(2, 3)
1045 int dev_err(const struct device *dev, const char *fmt, ...);
1046 extern __printf(2, 3)
1047 int dev_warn(const struct device *dev, const char *fmt, ...);
1048 extern __printf(2, 3)
1049 int dev_notice(const struct device *dev, const char *fmt, ...);
1050 extern __printf(2, 3)
1051 int _dev_info(const struct device *dev, const char *fmt, ...);
1052 
1053 #else
1054 
1055 static inline __printf(3, 0)
1056 int dev_vprintk_emit(int level, const struct device *dev,
1057                      const char *fmt, va_list args)
1058 { return 0; }
1059 static inline __printf(3, 4)
1060 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1061 { return 0; }
1062 
1063 static inline int __dev_printk(const char *level, const struct device *dev,
1064                                struct va_format *vaf)
1065 { return 0; }
1066 static inline __printf(3, 4)
1067 int dev_printk(const char *level, const struct device *dev,
1068                const char *fmt, ...)
1069 { return 0; }
1070 
1071 static inline __printf(2, 3)
1072 int dev_emerg(const struct device *dev, const char *fmt, ...)
1073 { return 0; }
1074 static inline __printf(2, 3)
1075 int dev_crit(const struct device *dev, const char *fmt, ...)
1076 { return 0; }
1077 static inline __printf(2, 3)
1078 int dev_alert(const struct device *dev, const char *fmt, ...)
1079 { return 0; }
1080 static inline __printf(2, 3)
1081 int dev_err(const struct device *dev, const char *fmt, ...)
1082 { return 0; }
1083 static inline __printf(2, 3)
1084 int dev_warn(const struct device *dev, const char *fmt, ...)
1085 { return 0; }
1086 static inline __printf(2, 3)
1087 int dev_notice(const struct device *dev, const char *fmt, ...)
1088 { return 0; }
1089 static inline __printf(2, 3)
1090 int _dev_info(const struct device *dev, const char *fmt, ...)
1091 { return 0; }
1092 
1093 #endif
1094 
1095 /*
1096  * Stupid hackaround for existing uses of non-printk uses dev_info
1097  *
1098  * Note that the definition of dev_info below is actually _dev_info
1099  * and a macro is used to avoid redefining dev_info
1100  */
1101 
1102 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1103 
1104 #if defined(CONFIG_DYNAMIC_DEBUG)
1105 #define dev_dbg(dev, format, ...)                    \
1106 do {                                                 \
1107         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1108 } while (0)
1109 #elif defined(DEBUG)
1110 #define dev_dbg(dev, format, arg...)            \
1111         dev_printk(KERN_DEBUG, dev, format, ##arg)
1112 #else
1113 #define dev_dbg(dev, format, arg...)                            \
1114 ({                                                              \
1115         if (0)                                                  \
1116                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
1117         0;                                                      \
1118 })
1119 #endif
1120 
1121 #define dev_level_ratelimited(dev_level, dev, fmt, ...)                 \
1122 do {                                                                    \
1123         static DEFINE_RATELIMIT_STATE(_rs,                              \
1124                                       DEFAULT_RATELIMIT_INTERVAL,       \
1125                                       DEFAULT_RATELIMIT_BURST);         \
1126         if (__ratelimit(&_rs))                                          \
1127                 dev_level(dev, fmt, ##__VA_ARGS__);                     \
1128 } while (0)
1129 
1130 #define dev_emerg_ratelimited(dev, fmt, ...)                            \
1131         dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1132 #define dev_alert_ratelimited(dev, fmt, ...)                            \
1133         dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1134 #define dev_crit_ratelimited(dev, fmt, ...)                             \
1135         dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1136 #define dev_err_ratelimited(dev, fmt, ...)                              \
1137         dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1138 #define dev_warn_ratelimited(dev, fmt, ...)                             \
1139         dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1140 #define dev_notice_ratelimited(dev, fmt, ...)                           \
1141         dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1142 #define dev_info_ratelimited(dev, fmt, ...)                             \
1143         dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1144 #if defined(CONFIG_DYNAMIC_DEBUG)
1145 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1146 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1147 do {                                                                    \
1148         static DEFINE_RATELIMIT_STATE(_rs,                              \
1149                                       DEFAULT_RATELIMIT_INTERVAL,       \
1150                                       DEFAULT_RATELIMIT_BURST);         \
1151         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
1152         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
1153             __ratelimit(&_rs))                                          \
1154                 __dynamic_dev_dbg(&descriptor, dev, fmt,                \
1155                                   ##__VA_ARGS__);                       \
1156 } while (0)
1157 #elif defined(DEBUG)
1158 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1159 do {                                                                    \
1160         static DEFINE_RATELIMIT_STATE(_rs,                              \
1161                                       DEFAULT_RATELIMIT_INTERVAL,       \
1162                                       DEFAULT_RATELIMIT_BURST);         \
1163         if (__ratelimit(&_rs))                                          \
1164                 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__);        \
1165 } while (0)
1166 #else
1167 #define dev_dbg_ratelimited(dev, fmt, ...)                      \
1168         no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
1169 #endif
1170 
1171 #ifdef VERBOSE_DEBUG
1172 #define dev_vdbg        dev_dbg
1173 #else
1174 #define dev_vdbg(dev, format, arg...)                           \
1175 ({                                                              \
1176         if (0)                                                  \
1177                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
1178         0;                                                      \
1179 })
1180 #endif
1181 
1182 /*
1183  * dev_WARN*() acts like dev_printk(), but with the key difference of
1184  * using WARN/WARN_ONCE to include file/line information and a backtrace.
1185  */
1186 #define dev_WARN(dev, format, arg...) \
1187         WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1188 
1189 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1190         WARN_ONCE(condition, "%s %s: " format, \
1191                         dev_driver_string(dev), dev_name(dev), ## arg)
1192 
1193 /* Create alias, so I can be autoloaded. */
1194 #define MODULE_ALIAS_CHARDEV(major,minor) \
1195         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1196 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1197         MODULE_ALIAS("char-major-" __stringify(major) "-*")
1198 
1199 #ifdef CONFIG_SYSFS_DEPRECATED
1200 extern long sysfs_deprecated;
1201 #else
1202 #define sysfs_deprecated 0
1203 #endif
1204 
1205 /**
1206  * module_driver() - Helper macro for drivers that don't do anything
1207  * special in module init/exit. This eliminates a lot of boilerplate.
1208  * Each module may only use this macro once, and calling it replaces
1209  * module_init() and module_exit().
1210  *
1211  * @__driver: driver name
1212  * @__register: register function for this driver type
1213  * @__unregister: unregister function for this driver type
1214  * @...: Additional arguments to be passed to __register and __unregister.
1215  *
1216  * Use this macro to construct bus specific macros for registering
1217  * drivers, and do not use it on its own.
1218  */
1219 #define module_driver(__driver, __register, __unregister, ...) \
1220 static int __init __driver##_init(void) \
1221 { \
1222         return __register(&(__driver) , ##__VA_ARGS__); \
1223 } \
1224 module_init(__driver##_init); \
1225 static void __exit __driver##_exit(void) \
1226 { \
1227         __unregister(&(__driver) , ##__VA_ARGS__); \
1228 } \
1229 module_exit(__driver##_exit);
1230 
1231 #endif /* _DEVICE_H_ */
1232 

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