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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 fwnode_handle;
 42 struct iommu_ops;
 43 struct iommu_group;
 44 
 45 struct bus_attribute {
 46         struct attribute        attr;
 47         ssize_t (*show)(struct bus_type *bus, char *buf);
 48         ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
 49 };
 50 
 51 #define BUS_ATTR(_name, _mode, _show, _store)   \
 52         struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
 53 #define BUS_ATTR_RW(_name) \
 54         struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
 55 #define BUS_ATTR_RO(_name) \
 56         struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
 57 
 58 extern int __must_check bus_create_file(struct bus_type *,
 59                                         struct bus_attribute *);
 60 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
 61 
 62 /**
 63  * struct bus_type - The bus type of the device
 64  *
 65  * @name:       The name of the bus.
 66  * @dev_name:   Used for subsystems to enumerate devices like ("foo%u", dev->id).
 67  * @dev_root:   Default device to use as the parent.
 68  * @dev_attrs:  Default attributes of the devices 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 positive value if the
 74  *              given device can be handled by the given driver and zero
 75  *              otherwise. It may also return error code if determining that
 76  *              the driver supports the device is not possible. In case of
 77  *              -EPROBE_DEFER it will queue the device for deferred probing.
 78  * @uevent:     Called when a device is added, removed, or a few other things
 79  *              that generate uevents to add the environment variables.
 80  * @probe:      Called when a new device or driver add to this bus, and callback
 81  *              the specific driver's probe to initial the matched device.
 82  * @remove:     Called when a device removed from this bus.
 83  * @shutdown:   Called at shut-down time to quiesce the device.
 84  *
 85  * @online:     Called to put the device back online (after offlining it).
 86  * @offline:    Called to put the device offline for hot-removal. May fail.
 87  *
 88  * @suspend:    Called when a device on this bus wants to go to sleep mode.
 89  * @resume:     Called to bring a device on this bus out of sleep mode.
 90  * @pm:         Power management operations of this bus, callback the specific
 91  *              device driver's pm-ops.
 92  * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
 93  *              driver implementations to a bus and allow the driver to do
 94  *              bus-specific setup
 95  * @p:          The private data of the driver core, only the driver core can
 96  *              touch this.
 97  * @lock_key:   Lock class key for use by the lock validator
 98  *
 99  * A bus is a channel between the processor and one or more devices. For the
100  * purposes of the device model, all devices are connected via a bus, even if
101  * it is an internal, virtual, "platform" bus. Buses can plug into each other.
102  * A USB controller is usually a PCI device, for example. The device model
103  * represents the actual connections between buses and the devices they control.
104  * A bus is represented by the bus_type structure. It contains the name, the
105  * default attributes, the bus' methods, PM operations, and the driver core's
106  * private data.
107  */
108 struct bus_type {
109         const char              *name;
110         const char              *dev_name;
111         struct device           *dev_root;
112         struct device_attribute *dev_attrs;     /* use dev_groups instead */
113         const struct attribute_group **bus_groups;
114         const struct attribute_group **dev_groups;
115         const struct attribute_group **drv_groups;
116 
117         int (*match)(struct device *dev, struct device_driver *drv);
118         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
119         int (*probe)(struct device *dev);
120         int (*remove)(struct device *dev);
121         void (*shutdown)(struct device *dev);
122 
123         int (*online)(struct device *dev);
124         int (*offline)(struct device *dev);
125 
126         int (*suspend)(struct device *dev, pm_message_t state);
127         int (*resume)(struct device *dev);
128 
129         const struct dev_pm_ops *pm;
130 
131         const struct iommu_ops *iommu_ops;
132 
133         struct subsys_private *p;
134         struct lock_class_key lock_key;
135 };
136 
137 extern int __must_check bus_register(struct bus_type *bus);
138 
139 extern void bus_unregister(struct bus_type *bus);
140 
141 extern int __must_check bus_rescan_devices(struct bus_type *bus);
142 
143 /* iterator helpers for buses */
144 struct subsys_dev_iter {
145         struct klist_iter               ki;
146         const struct device_type        *type;
147 };
148 void subsys_dev_iter_init(struct subsys_dev_iter *iter,
149                          struct bus_type *subsys,
150                          struct device *start,
151                          const struct device_type *type);
152 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
153 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
154 
155 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
156                      int (*fn)(struct device *dev, void *data));
157 struct device *bus_find_device(struct bus_type *bus, struct device *start,
158                                void *data,
159                                int (*match)(struct device *dev, void *data));
160 struct device *bus_find_device_by_name(struct bus_type *bus,
161                                        struct device *start,
162                                        const char *name);
163 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
164                                         struct device *hint);
165 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
166                      void *data, int (*fn)(struct device_driver *, void *));
167 void bus_sort_breadthfirst(struct bus_type *bus,
168                            int (*compare)(const struct device *a,
169                                           const struct device *b));
170 /*
171  * Bus notifiers: Get notified of addition/removal of devices
172  * and binding/unbinding of drivers to devices.
173  * In the long run, it should be a replacement for the platform
174  * notify hooks.
175  */
176 struct notifier_block;
177 
178 extern int bus_register_notifier(struct bus_type *bus,
179                                  struct notifier_block *nb);
180 extern int bus_unregister_notifier(struct bus_type *bus,
181                                    struct notifier_block *nb);
182 
183 /* All 4 notifers below get called with the target struct device *
184  * as an argument. Note that those functions are likely to be called
185  * with the device lock held in the core, so be careful.
186  */
187 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
188 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device to be removed */
189 #define BUS_NOTIFY_REMOVED_DEVICE       0x00000003 /* device removed */
190 #define BUS_NOTIFY_BIND_DRIVER          0x00000004 /* driver about to be
191                                                       bound */
192 #define BUS_NOTIFY_BOUND_DRIVER         0x00000005 /* driver bound to device */
193 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000006 /* driver about to be
194                                                       unbound */
195 #define BUS_NOTIFY_UNBOUND_DRIVER       0x00000007 /* driver is unbound
196                                                       from the device */
197 #define BUS_NOTIFY_DRIVER_NOT_BOUND     0x00000008 /* driver fails to be bound */
198 
199 extern struct kset *bus_get_kset(struct bus_type *bus);
200 extern struct klist *bus_get_device_klist(struct bus_type *bus);
201 
202 /**
203  * enum probe_type - device driver probe type to try
204  *      Device drivers may opt in for special handling of their
205  *      respective probe routines. This tells the core what to
206  *      expect and prefer.
207  *
208  * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
209  *      whether probed synchronously or asynchronously.
210  * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
211  *      probing order is not essential for booting the system may
212  *      opt into executing their probes asynchronously.
213  * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
214  *      their probe routines to run synchronously with driver and
215  *      device registration (with the exception of -EPROBE_DEFER
216  *      handling - re-probing always ends up being done asynchronously).
217  *
218  * Note that the end goal is to switch the kernel to use asynchronous
219  * probing by default, so annotating drivers with
220  * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
221  * to speed up boot process while we are validating the rest of the
222  * drivers.
223  */
224 enum probe_type {
225         PROBE_DEFAULT_STRATEGY,
226         PROBE_PREFER_ASYNCHRONOUS,
227         PROBE_FORCE_SYNCHRONOUS,
228 };
229 
230 /**
231  * struct device_driver - The basic device driver structure
232  * @name:       Name of the device driver.
233  * @bus:        The bus which the device of this driver belongs to.
234  * @owner:      The module owner.
235  * @mod_name:   Used for built-in modules.
236  * @suppress_bind_attrs: Disables bind/unbind via sysfs.
237  * @probe_type: Type of the probe (synchronous or asynchronous) to use.
238  * @of_match_table: The open firmware table.
239  * @acpi_match_table: The ACPI match table.
240  * @probe:      Called to query the existence of a specific device,
241  *              whether this driver can work with it, and bind the driver
242  *              to a specific device.
243  * @remove:     Called when the device is removed from the system to
244  *              unbind a device from this driver.
245  * @shutdown:   Called at shut-down time to quiesce the device.
246  * @suspend:    Called to put the device to sleep mode. Usually to a
247  *              low power state.
248  * @resume:     Called to bring a device from sleep mode.
249  * @groups:     Default attributes that get created by the driver core
250  *              automatically.
251  * @pm:         Power management operations of the device which matched
252  *              this driver.
253  * @p:          Driver core's private data, no one other than the driver
254  *              core can touch this.
255  *
256  * The device driver-model tracks all of the drivers known to the system.
257  * The main reason for this tracking is to enable the driver core to match
258  * up drivers with new devices. Once drivers are known objects within the
259  * system, however, a number of other things become possible. Device drivers
260  * can export information and configuration variables that are independent
261  * of any specific device.
262  */
263 struct device_driver {
264         const char              *name;
265         struct bus_type         *bus;
266 
267         struct module           *owner;
268         const char              *mod_name;      /* used for built-in modules */
269 
270         bool suppress_bind_attrs;       /* disables bind/unbind via sysfs */
271         enum probe_type probe_type;
272 
273         const struct of_device_id       *of_match_table;
274         const struct acpi_device_id     *acpi_match_table;
275 
276         int (*probe) (struct device *dev);
277         int (*remove) (struct device *dev);
278         void (*shutdown) (struct device *dev);
279         int (*suspend) (struct device *dev, pm_message_t state);
280         int (*resume) (struct device *dev);
281         const struct attribute_group **groups;
282 
283         const struct dev_pm_ops *pm;
284 
285         struct driver_private *p;
286 };
287 
288 
289 extern int __must_check driver_register(struct device_driver *drv);
290 extern void driver_unregister(struct device_driver *drv);
291 
292 extern struct device_driver *driver_find(const char *name,
293                                          struct bus_type *bus);
294 extern int driver_probe_done(void);
295 extern void wait_for_device_probe(void);
296 
297 
298 /* sysfs interface for exporting driver attributes */
299 
300 struct driver_attribute {
301         struct attribute attr;
302         ssize_t (*show)(struct device_driver *driver, char *buf);
303         ssize_t (*store)(struct device_driver *driver, const char *buf,
304                          size_t count);
305 };
306 
307 #define DRIVER_ATTR(_name, _mode, _show, _store) \
308         struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store)
309 #define DRIVER_ATTR_RW(_name) \
310         struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
311 #define DRIVER_ATTR_RO(_name) \
312         struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
313 #define DRIVER_ATTR_WO(_name) \
314         struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
315 
316 extern int __must_check driver_create_file(struct device_driver *driver,
317                                         const struct driver_attribute *attr);
318 extern void driver_remove_file(struct device_driver *driver,
319                                const struct driver_attribute *attr);
320 
321 extern int __must_check driver_for_each_device(struct device_driver *drv,
322                                                struct device *start,
323                                                void *data,
324                                                int (*fn)(struct device *dev,
325                                                          void *));
326 struct device *driver_find_device(struct device_driver *drv,
327                                   struct device *start, void *data,
328                                   int (*match)(struct device *dev, void *data));
329 
330 /**
331  * struct subsys_interface - interfaces to device functions
332  * @name:       name of the device function
333  * @subsys:     subsytem of the devices to attach to
334  * @node:       the list of functions registered at the subsystem
335  * @add_dev:    device hookup to device function handler
336  * @remove_dev: device hookup to device function handler
337  *
338  * Simple interfaces attached to a subsystem. Multiple interfaces can
339  * attach to a subsystem and its devices. Unlike drivers, they do not
340  * exclusively claim or control devices. Interfaces usually represent
341  * a specific functionality of a subsystem/class of devices.
342  */
343 struct subsys_interface {
344         const char *name;
345         struct bus_type *subsys;
346         struct list_head node;
347         int (*add_dev)(struct device *dev, struct subsys_interface *sif);
348         void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
349 };
350 
351 int subsys_interface_register(struct subsys_interface *sif);
352 void subsys_interface_unregister(struct subsys_interface *sif);
353 
354 int subsys_system_register(struct bus_type *subsys,
355                            const struct attribute_group **groups);
356 int subsys_virtual_register(struct bus_type *subsys,
357                             const struct attribute_group **groups);
358 
359 /**
360  * struct class - device classes
361  * @name:       Name of the class.
362  * @owner:      The module owner.
363  * @class_attrs: Default attributes of this class.
364  * @dev_groups: Default attributes of the devices that belong to the class.
365  * @dev_kobj:   The kobject that represents this class and links it into the hierarchy.
366  * @dev_uevent: Called when a device is added, removed from this class, or a
367  *              few other things that generate uevents to add the environment
368  *              variables.
369  * @devnode:    Callback to provide the devtmpfs.
370  * @class_release: Called to release this class.
371  * @dev_release: Called to release the device.
372  * @suspend:    Used to put the device to sleep mode, usually to a low power
373  *              state.
374  * @resume:     Used to bring the device from the sleep mode.
375  * @ns_type:    Callbacks so sysfs can detemine namespaces.
376  * @namespace:  Namespace of the device belongs to this class.
377  * @pm:         The default device power management operations of this class.
378  * @p:          The private data of the driver core, no one other than the
379  *              driver core can touch this.
380  *
381  * A class is a higher-level view of a device that abstracts out low-level
382  * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
383  * at the class level, they are all simply disks. Classes allow user space
384  * to work with devices based on what they do, rather than how they are
385  * connected or how they work.
386  */
387 struct class {
388         const char              *name;
389         struct module           *owner;
390 
391         struct class_attribute          *class_attrs;
392         const struct attribute_group    **dev_groups;
393         struct kobject                  *dev_kobj;
394 
395         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
396         char *(*devnode)(struct device *dev, umode_t *mode);
397 
398         void (*class_release)(struct class *class);
399         void (*dev_release)(struct device *dev);
400 
401         int (*suspend)(struct device *dev, pm_message_t state);
402         int (*resume)(struct device *dev);
403 
404         const struct kobj_ns_type_operations *ns_type;
405         const void *(*namespace)(struct device *dev);
406 
407         const struct dev_pm_ops *pm;
408 
409         struct subsys_private *p;
410 };
411 
412 struct class_dev_iter {
413         struct klist_iter               ki;
414         const struct device_type        *type;
415 };
416 
417 extern struct kobject *sysfs_dev_block_kobj;
418 extern struct kobject *sysfs_dev_char_kobj;
419 extern int __must_check __class_register(struct class *class,
420                                          struct lock_class_key *key);
421 extern void class_unregister(struct class *class);
422 
423 /* This is a #define to keep the compiler from merging different
424  * instances of the __key variable */
425 #define class_register(class)                   \
426 ({                                              \
427         static struct lock_class_key __key;     \
428         __class_register(class, &__key);        \
429 })
430 
431 struct class_compat;
432 struct class_compat *class_compat_register(const char *name);
433 void class_compat_unregister(struct class_compat *cls);
434 int class_compat_create_link(struct class_compat *cls, struct device *dev,
435                              struct device *device_link);
436 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
437                               struct device *device_link);
438 
439 extern void class_dev_iter_init(struct class_dev_iter *iter,
440                                 struct class *class,
441                                 struct device *start,
442                                 const struct device_type *type);
443 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
444 extern void class_dev_iter_exit(struct class_dev_iter *iter);
445 
446 extern int class_for_each_device(struct class *class, struct device *start,
447                                  void *data,
448                                  int (*fn)(struct device *dev, void *data));
449 extern struct device *class_find_device(struct class *class,
450                                         struct device *start, const void *data,
451                                         int (*match)(struct device *, const void *));
452 
453 struct class_attribute {
454         struct attribute attr;
455         ssize_t (*show)(struct class *class, struct class_attribute *attr,
456                         char *buf);
457         ssize_t (*store)(struct class *class, struct class_attribute *attr,
458                         const char *buf, size_t count);
459 };
460 
461 #define CLASS_ATTR(_name, _mode, _show, _store) \
462         struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
463 #define CLASS_ATTR_RW(_name) \
464         struct class_attribute class_attr_##_name = __ATTR_RW(_name)
465 #define CLASS_ATTR_RO(_name) \
466         struct class_attribute class_attr_##_name = __ATTR_RO(_name)
467 
468 extern int __must_check class_create_file_ns(struct class *class,
469                                              const struct class_attribute *attr,
470                                              const void *ns);
471 extern void class_remove_file_ns(struct class *class,
472                                  const struct class_attribute *attr,
473                                  const void *ns);
474 
475 static inline int __must_check class_create_file(struct class *class,
476                                         const struct class_attribute *attr)
477 {
478         return class_create_file_ns(class, attr, NULL);
479 }
480 
481 static inline void class_remove_file(struct class *class,
482                                      const struct class_attribute *attr)
483 {
484         return class_remove_file_ns(class, attr, NULL);
485 }
486 
487 /* Simple class attribute that is just a static string */
488 struct class_attribute_string {
489         struct class_attribute attr;
490         char *str;
491 };
492 
493 /* Currently read-only only */
494 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
495         { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
496 #define CLASS_ATTR_STRING(_name, _mode, _str) \
497         struct class_attribute_string class_attr_##_name = \
498                 _CLASS_ATTR_STRING(_name, _mode, _str)
499 
500 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
501                         char *buf);
502 
503 struct class_interface {
504         struct list_head        node;
505         struct class            *class;
506 
507         int (*add_dev)          (struct device *, struct class_interface *);
508         void (*remove_dev)      (struct device *, struct class_interface *);
509 };
510 
511 extern int __must_check class_interface_register(struct class_interface *);
512 extern void class_interface_unregister(struct class_interface *);
513 
514 extern struct class * __must_check __class_create(struct module *owner,
515                                                   const char *name,
516                                                   struct lock_class_key *key);
517 extern void class_destroy(struct class *cls);
518 
519 /* This is a #define to keep the compiler from merging different
520  * instances of the __key variable */
521 #define class_create(owner, name)               \
522 ({                                              \
523         static struct lock_class_key __key;     \
524         __class_create(owner, name, &__key);    \
525 })
526 
527 /*
528  * The type of device, "struct device" is embedded in. A class
529  * or bus can contain devices of different types
530  * like "partitions" and "disks", "mouse" and "event".
531  * This identifies the device type and carries type-specific
532  * information, equivalent to the kobj_type of a kobject.
533  * If "name" is specified, the uevent will contain it in
534  * the DEVTYPE variable.
535  */
536 struct device_type {
537         const char *name;
538         const struct attribute_group **groups;
539         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
540         char *(*devnode)(struct device *dev, umode_t *mode,
541                          kuid_t *uid, kgid_t *gid);
542         void (*release)(struct device *dev);
543 
544         const struct dev_pm_ops *pm;
545 };
546 
547 /* interface for exporting device attributes */
548 struct device_attribute {
549         struct attribute        attr;
550         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
551                         char *buf);
552         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
553                          const char *buf, size_t count);
554 };
555 
556 struct dev_ext_attribute {
557         struct device_attribute attr;
558         void *var;
559 };
560 
561 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
562                           char *buf);
563 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
564                            const char *buf, size_t count);
565 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
566                         char *buf);
567 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
568                          const char *buf, size_t count);
569 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
570                         char *buf);
571 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
572                          const char *buf, size_t count);
573 
574 #define DEVICE_ATTR(_name, _mode, _show, _store) \
575         struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
576 #define DEVICE_ATTR_RW(_name) \
577         struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
578 #define DEVICE_ATTR_RO(_name) \
579         struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
580 #define DEVICE_ATTR_WO(_name) \
581         struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
582 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
583         struct dev_ext_attribute dev_attr_##_name = \
584                 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
585 #define DEVICE_INT_ATTR(_name, _mode, _var) \
586         struct dev_ext_attribute dev_attr_##_name = \
587                 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
588 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
589         struct dev_ext_attribute dev_attr_##_name = \
590                 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
591 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
592         struct device_attribute dev_attr_##_name =              \
593                 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
594 
595 extern int device_create_file(struct device *device,
596                               const struct device_attribute *entry);
597 extern void device_remove_file(struct device *dev,
598                                const struct device_attribute *attr);
599 extern bool device_remove_file_self(struct device *dev,
600                                     const struct device_attribute *attr);
601 extern int __must_check device_create_bin_file(struct device *dev,
602                                         const struct bin_attribute *attr);
603 extern void device_remove_bin_file(struct device *dev,
604                                    const struct bin_attribute *attr);
605 
606 /* device resource management */
607 typedef void (*dr_release_t)(struct device *dev, void *res);
608 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
609 
610 #ifdef CONFIG_DEBUG_DEVRES
611 extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
612                                  int nid, const char *name) __malloc;
613 #define devres_alloc(release, size, gfp) \
614         __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
615 #define devres_alloc_node(release, size, gfp, nid) \
616         __devres_alloc_node(release, size, gfp, nid, #release)
617 #else
618 extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
619                                int nid) __malloc;
620 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
621 {
622         return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
623 }
624 #endif
625 
626 extern void devres_for_each_res(struct device *dev, dr_release_t release,
627                                 dr_match_t match, void *match_data,
628                                 void (*fn)(struct device *, void *, void *),
629                                 void *data);
630 extern void devres_free(void *res);
631 extern void devres_add(struct device *dev, void *res);
632 extern void *devres_find(struct device *dev, dr_release_t release,
633                          dr_match_t match, void *match_data);
634 extern void *devres_get(struct device *dev, void *new_res,
635                         dr_match_t match, void *match_data);
636 extern void *devres_remove(struct device *dev, dr_release_t release,
637                            dr_match_t match, void *match_data);
638 extern int devres_destroy(struct device *dev, dr_release_t release,
639                           dr_match_t match, void *match_data);
640 extern int devres_release(struct device *dev, dr_release_t release,
641                           dr_match_t match, void *match_data);
642 
643 /* devres group */
644 extern void * __must_check devres_open_group(struct device *dev, void *id,
645                                              gfp_t gfp);
646 extern void devres_close_group(struct device *dev, void *id);
647 extern void devres_remove_group(struct device *dev, void *id);
648 extern int devres_release_group(struct device *dev, void *id);
649 
650 /* managed devm_k.alloc/kfree for device drivers */
651 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
652 extern __printf(3, 0)
653 char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
654                       va_list ap) __malloc;
655 extern __printf(3, 4)
656 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
657 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
658 {
659         return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
660 }
661 static inline void *devm_kmalloc_array(struct device *dev,
662                                        size_t n, size_t size, gfp_t flags)
663 {
664         if (size != 0 && n > SIZE_MAX / size)
665                 return NULL;
666         return devm_kmalloc(dev, n * size, flags);
667 }
668 static inline void *devm_kcalloc(struct device *dev,
669                                  size_t n, size_t size, gfp_t flags)
670 {
671         return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
672 }
673 extern void devm_kfree(struct device *dev, void *p);
674 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
675 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
676                           gfp_t gfp);
677 
678 extern unsigned long devm_get_free_pages(struct device *dev,
679                                          gfp_t gfp_mask, unsigned int order);
680 extern void devm_free_pages(struct device *dev, unsigned long addr);
681 
682 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
683 
684 /* allows to add/remove a custom action to devres stack */
685 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
686 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
687 
688 static inline int devm_add_action_or_reset(struct device *dev,
689                                            void (*action)(void *), void *data)
690 {
691         int ret;
692 
693         ret = devm_add_action(dev, action, data);
694         if (ret)
695                 action(data);
696 
697         return ret;
698 }
699 
700 struct device_dma_parameters {
701         /*
702          * a low level driver may set these to teach IOMMU code about
703          * sg limitations.
704          */
705         unsigned int max_segment_size;
706         unsigned long segment_boundary_mask;
707 };
708 
709 /**
710  * struct device - The basic device structure
711  * @parent:     The device's "parent" device, the device to which it is attached.
712  *              In most cases, a parent device is some sort of bus or host
713  *              controller. If parent is NULL, the device, is a top-level device,
714  *              which is not usually what you want.
715  * @p:          Holds the private data of the driver core portions of the device.
716  *              See the comment of the struct device_private for detail.
717  * @kobj:       A top-level, abstract class from which other classes are derived.
718  * @init_name:  Initial name of the device.
719  * @type:       The type of device.
720  *              This identifies the device type and carries type-specific
721  *              information.
722  * @mutex:      Mutex to synchronize calls to its driver.
723  * @bus:        Type of bus device is on.
724  * @driver:     Which driver has allocated this
725  * @platform_data: Platform data specific to the device.
726  *              Example: For devices on custom boards, as typical of embedded
727  *              and SOC based hardware, Linux often uses platform_data to point
728  *              to board-specific structures describing devices and how they
729  *              are wired.  That can include what ports are available, chip
730  *              variants, which GPIO pins act in what additional roles, and so
731  *              on.  This shrinks the "Board Support Packages" (BSPs) and
732  *              minimizes board-specific #ifdefs in drivers.
733  * @driver_data: Private pointer for driver specific info.
734  * @power:      For device power management.
735  *              See Documentation/power/devices.txt for details.
736  * @pm_domain:  Provide callbacks that are executed during system suspend,
737  *              hibernation, system resume and during runtime PM transitions
738  *              along with subsystem-level and driver-level callbacks.
739  * @pins:       For device pin management.
740  *              See Documentation/pinctrl.txt for details.
741  * @msi_list:   Hosts MSI descriptors
742  * @msi_domain: The generic MSI domain this device is using.
743  * @numa_node:  NUMA node this device is close to.
744  * @dma_mask:   Dma mask (if dma'ble device).
745  * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
746  *              hardware supports 64-bit addresses for consistent allocations
747  *              such descriptors.
748  * @dma_pfn_offset: offset of DMA memory range relatively of RAM
749  * @dma_parms:  A low level driver may set these to teach IOMMU code about
750  *              segment limitations.
751  * @dma_pools:  Dma pools (if dma'ble device).
752  * @dma_mem:    Internal for coherent mem override.
753  * @cma_area:   Contiguous memory area for dma allocations
754  * @archdata:   For arch-specific additions.
755  * @of_node:    Associated device tree node.
756  * @fwnode:     Associated device node supplied by platform firmware.
757  * @devt:       For creating the sysfs "dev".
758  * @id:         device instance
759  * @devres_lock: Spinlock to protect the resource of the device.
760  * @devres_head: The resources list of the device.
761  * @knode_class: The node used to add the device to the class list.
762  * @class:      The class of the device.
763  * @groups:     Optional attribute groups.
764  * @release:    Callback to free the device after all references have
765  *              gone away. This should be set by the allocator of the
766  *              device (i.e. the bus driver that discovered the device).
767  * @iommu_group: IOMMU group the device belongs to.
768  *
769  * @offline_disabled: If set, the device is permanently online.
770  * @offline:    Set after successful invocation of bus type's .offline().
771  *
772  * At the lowest level, every device in a Linux system is represented by an
773  * instance of struct device. The device structure contains the information
774  * that the device model core needs to model the system. Most subsystems,
775  * however, track additional information about the devices they host. As a
776  * result, it is rare for devices to be represented by bare device structures;
777  * instead, that structure, like kobject structures, is usually embedded within
778  * a higher-level representation of the device.
779  */
780 struct device {
781         struct device           *parent;
782 
783         struct device_private   *p;
784 
785         struct kobject kobj;
786         const char              *init_name; /* initial name of the device */
787         const struct device_type *type;
788 
789         struct mutex            mutex;  /* mutex to synchronize calls to
790                                          * its driver.
791                                          */
792 
793         struct bus_type *bus;           /* type of bus device is on */
794         struct device_driver *driver;   /* which driver has allocated this
795                                            device */
796         void            *platform_data; /* Platform specific data, device
797                                            core doesn't touch it */
798         void            *driver_data;   /* Driver data, set and get with
799                                            dev_set/get_drvdata */
800         struct dev_pm_info      power;
801         struct dev_pm_domain    *pm_domain;
802 
803 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
804         struct irq_domain       *msi_domain;
805 #endif
806 #ifdef CONFIG_PINCTRL
807         struct dev_pin_info     *pins;
808 #endif
809 #ifdef CONFIG_GENERIC_MSI_IRQ
810         struct list_head        msi_list;
811 #endif
812 
813 #ifdef CONFIG_NUMA
814         int             numa_node;      /* NUMA node this device is close to */
815 #endif
816         u64             *dma_mask;      /* dma mask (if dma'able device) */
817         u64             coherent_dma_mask;/* Like dma_mask, but for
818                                              alloc_coherent mappings as
819                                              not all hardware supports
820                                              64 bit addresses for consistent
821                                              allocations such descriptors. */
822         unsigned long   dma_pfn_offset;
823 
824         struct device_dma_parameters *dma_parms;
825 
826         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
827 
828         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
829                                              override */
830 #ifdef CONFIG_DMA_CMA
831         struct cma *cma_area;           /* contiguous memory area for dma
832                                            allocations */
833 #endif
834         /* arch specific additions */
835         struct dev_archdata     archdata;
836 
837         struct device_node      *of_node; /* associated device tree node */
838         struct fwnode_handle    *fwnode; /* firmware device node */
839 
840         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
841         u32                     id;     /* device instance */
842 
843         spinlock_t              devres_lock;
844         struct list_head        devres_head;
845 
846         struct klist_node       knode_class;
847         struct class            *class;
848         const struct attribute_group **groups;  /* optional groups */
849 
850         void    (*release)(struct device *dev);
851         struct iommu_group      *iommu_group;
852 
853         bool                    offline_disabled:1;
854         bool                    offline:1;
855 };
856 
857 static inline struct device *kobj_to_dev(struct kobject *kobj)
858 {
859         return container_of(kobj, struct device, kobj);
860 }
861 
862 /* Get the wakeup routines, which depend on struct device */
863 #include <linux/pm_wakeup.h>
864 
865 static inline const char *dev_name(const struct device *dev)
866 {
867         /* Use the init name until the kobject becomes available */
868         if (dev->init_name)
869                 return dev->init_name;
870 
871         return kobject_name(&dev->kobj);
872 }
873 
874 extern __printf(2, 3)
875 int dev_set_name(struct device *dev, const char *name, ...);
876 
877 #ifdef CONFIG_NUMA
878 static inline int dev_to_node(struct device *dev)
879 {
880         return dev->numa_node;
881 }
882 static inline void set_dev_node(struct device *dev, int node)
883 {
884         dev->numa_node = node;
885 }
886 #else
887 static inline int dev_to_node(struct device *dev)
888 {
889         return -1;
890 }
891 static inline void set_dev_node(struct device *dev, int node)
892 {
893 }
894 #endif
895 
896 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
897 {
898 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
899         return dev->msi_domain;
900 #else
901         return NULL;
902 #endif
903 }
904 
905 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
906 {
907 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
908         dev->msi_domain = d;
909 #endif
910 }
911 
912 static inline void *dev_get_drvdata(const struct device *dev)
913 {
914         return dev->driver_data;
915 }
916 
917 static inline void dev_set_drvdata(struct device *dev, void *data)
918 {
919         dev->driver_data = data;
920 }
921 
922 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
923 {
924         return dev ? dev->power.subsys_data : NULL;
925 }
926 
927 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
928 {
929         return dev->kobj.uevent_suppress;
930 }
931 
932 static inline void dev_set_uevent_suppress(struct device *dev, int val)
933 {
934         dev->kobj.uevent_suppress = val;
935 }
936 
937 static inline int device_is_registered(struct device *dev)
938 {
939         return dev->kobj.state_in_sysfs;
940 }
941 
942 static inline void device_enable_async_suspend(struct device *dev)
943 {
944         if (!dev->power.is_prepared)
945                 dev->power.async_suspend = true;
946 }
947 
948 static inline void device_disable_async_suspend(struct device *dev)
949 {
950         if (!dev->power.is_prepared)
951                 dev->power.async_suspend = false;
952 }
953 
954 static inline bool device_async_suspend_enabled(struct device *dev)
955 {
956         return !!dev->power.async_suspend;
957 }
958 
959 static inline void dev_pm_syscore_device(struct device *dev, bool val)
960 {
961 #ifdef CONFIG_PM_SLEEP
962         dev->power.syscore = val;
963 #endif
964 }
965 
966 static inline void device_lock(struct device *dev)
967 {
968         mutex_lock(&dev->mutex);
969 }
970 
971 static inline int device_lock_interruptible(struct device *dev)
972 {
973         return mutex_lock_interruptible(&dev->mutex);
974 }
975 
976 static inline int device_trylock(struct device *dev)
977 {
978         return mutex_trylock(&dev->mutex);
979 }
980 
981 static inline void device_unlock(struct device *dev)
982 {
983         mutex_unlock(&dev->mutex);
984 }
985 
986 static inline void device_lock_assert(struct device *dev)
987 {
988         lockdep_assert_held(&dev->mutex);
989 }
990 
991 static inline struct device_node *dev_of_node(struct device *dev)
992 {
993         if (!IS_ENABLED(CONFIG_OF))
994                 return NULL;
995         return dev->of_node;
996 }
997 
998 void driver_init(void);
999 
1000 /*
1001  * High level routines for use by the bus drivers
1002  */
1003 extern int __must_check device_register(struct device *dev);
1004 extern void device_unregister(struct device *dev);
1005 extern void device_initialize(struct device *dev);
1006 extern int __must_check device_add(struct device *dev);
1007 extern void device_del(struct device *dev);
1008 extern int device_for_each_child(struct device *dev, void *data,
1009                      int (*fn)(struct device *dev, void *data));
1010 extern int device_for_each_child_reverse(struct device *dev, void *data,
1011                      int (*fn)(struct device *dev, void *data));
1012 extern struct device *device_find_child(struct device *dev, void *data,
1013                                 int (*match)(struct device *dev, void *data));
1014 extern int device_rename(struct device *dev, const char *new_name);
1015 extern int device_move(struct device *dev, struct device *new_parent,
1016                        enum dpm_order dpm_order);
1017 extern const char *device_get_devnode(struct device *dev,
1018                                       umode_t *mode, kuid_t *uid, kgid_t *gid,
1019                                       const char **tmp);
1020 
1021 static inline bool device_supports_offline(struct device *dev)
1022 {
1023         return dev->bus && dev->bus->offline && dev->bus->online;
1024 }
1025 
1026 extern void lock_device_hotplug(void);
1027 extern void unlock_device_hotplug(void);
1028 extern int lock_device_hotplug_sysfs(void);
1029 extern int device_offline(struct device *dev);
1030 extern int device_online(struct device *dev);
1031 extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1032 extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1033 
1034 /*
1035  * Root device objects for grouping under /sys/devices
1036  */
1037 extern struct device *__root_device_register(const char *name,
1038                                              struct module *owner);
1039 
1040 /* This is a macro to avoid include problems with THIS_MODULE */
1041 #define root_device_register(name) \
1042         __root_device_register(name, THIS_MODULE)
1043 
1044 extern void root_device_unregister(struct device *root);
1045 
1046 static inline void *dev_get_platdata(const struct device *dev)
1047 {
1048         return dev->platform_data;
1049 }
1050 
1051 /*
1052  * Manual binding of a device to driver. See drivers/base/bus.c
1053  * for information on use.
1054  */
1055 extern int __must_check device_bind_driver(struct device *dev);
1056 extern void device_release_driver(struct device *dev);
1057 extern int  __must_check device_attach(struct device *dev);
1058 extern int __must_check driver_attach(struct device_driver *drv);
1059 extern void device_initial_probe(struct device *dev);
1060 extern int __must_check device_reprobe(struct device *dev);
1061 
1062 extern bool device_is_bound(struct device *dev);
1063 
1064 /*
1065  * Easy functions for dynamically creating devices on the fly
1066  */
1067 extern __printf(5, 0)
1068 struct device *device_create_vargs(struct class *cls, struct device *parent,
1069                                    dev_t devt, void *drvdata,
1070                                    const char *fmt, va_list vargs);
1071 extern __printf(5, 6)
1072 struct device *device_create(struct class *cls, struct device *parent,
1073                              dev_t devt, void *drvdata,
1074                              const char *fmt, ...);
1075 extern __printf(6, 7)
1076 struct device *device_create_with_groups(struct class *cls,
1077                              struct device *parent, dev_t devt, void *drvdata,
1078                              const struct attribute_group **groups,
1079                              const char *fmt, ...);
1080 extern void device_destroy(struct class *cls, dev_t devt);
1081 
1082 /*
1083  * Platform "fixup" functions - allow the platform to have their say
1084  * about devices and actions that the general device layer doesn't
1085  * know about.
1086  */
1087 /* Notify platform of device discovery */
1088 extern int (*platform_notify)(struct device *dev);
1089 
1090 extern int (*platform_notify_remove)(struct device *dev);
1091 
1092 
1093 /*
1094  * get_device - atomically increment the reference count for the device.
1095  *
1096  */
1097 extern struct device *get_device(struct device *dev);
1098 extern void put_device(struct device *dev);
1099 
1100 #ifdef CONFIG_DEVTMPFS
1101 extern int devtmpfs_create_node(struct device *dev);
1102 extern int devtmpfs_delete_node(struct device *dev);
1103 extern int devtmpfs_mount(const char *mntdir);
1104 #else
1105 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1106 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1107 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1108 #endif
1109 
1110 /* drivers/base/power/shutdown.c */
1111 extern void device_shutdown(void);
1112 
1113 /* debugging and troubleshooting/diagnostic helpers. */
1114 extern const char *dev_driver_string(const struct device *dev);
1115 
1116 
1117 #ifdef CONFIG_PRINTK
1118 
1119 extern __printf(3, 0)
1120 int dev_vprintk_emit(int level, const struct device *dev,
1121                      const char *fmt, va_list args);
1122 extern __printf(3, 4)
1123 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1124 
1125 extern __printf(3, 4)
1126 void dev_printk(const char *level, const struct device *dev,
1127                 const char *fmt, ...);
1128 extern __printf(2, 3)
1129 void dev_emerg(const struct device *dev, const char *fmt, ...);
1130 extern __printf(2, 3)
1131 void dev_alert(const struct device *dev, const char *fmt, ...);
1132 extern __printf(2, 3)
1133 void dev_crit(const struct device *dev, const char *fmt, ...);
1134 extern __printf(2, 3)
1135 void dev_err(const struct device *dev, const char *fmt, ...);
1136 extern __printf(2, 3)
1137 void dev_warn(const struct device *dev, const char *fmt, ...);
1138 extern __printf(2, 3)
1139 void dev_notice(const struct device *dev, const char *fmt, ...);
1140 extern __printf(2, 3)
1141 void _dev_info(const struct device *dev, const char *fmt, ...);
1142 
1143 #else
1144 
1145 static inline __printf(3, 0)
1146 int dev_vprintk_emit(int level, const struct device *dev,
1147                      const char *fmt, va_list args)
1148 { return 0; }
1149 static inline __printf(3, 4)
1150 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1151 { return 0; }
1152 
1153 static inline void __dev_printk(const char *level, const struct device *dev,
1154                                 struct va_format *vaf)
1155 {}
1156 static inline __printf(3, 4)
1157 void dev_printk(const char *level, const struct device *dev,
1158                 const char *fmt, ...)
1159 {}
1160 
1161 static inline __printf(2, 3)
1162 void dev_emerg(const struct device *dev, const char *fmt, ...)
1163 {}
1164 static inline __printf(2, 3)
1165 void dev_crit(const struct device *dev, const char *fmt, ...)
1166 {}
1167 static inline __printf(2, 3)
1168 void dev_alert(const struct device *dev, const char *fmt, ...)
1169 {}
1170 static inline __printf(2, 3)
1171 void dev_err(const struct device *dev, const char *fmt, ...)
1172 {}
1173 static inline __printf(2, 3)
1174 void dev_warn(const struct device *dev, const char *fmt, ...)
1175 {}
1176 static inline __printf(2, 3)
1177 void dev_notice(const struct device *dev, const char *fmt, ...)
1178 {}
1179 static inline __printf(2, 3)
1180 void _dev_info(const struct device *dev, const char *fmt, ...)
1181 {}
1182 
1183 #endif
1184 
1185 /*
1186  * Stupid hackaround for existing uses of non-printk uses dev_info
1187  *
1188  * Note that the definition of dev_info below is actually _dev_info
1189  * and a macro is used to avoid redefining dev_info
1190  */
1191 
1192 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1193 
1194 #if defined(CONFIG_DYNAMIC_DEBUG)
1195 #define dev_dbg(dev, format, ...)                    \
1196 do {                                                 \
1197         dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1198 } while (0)
1199 #elif defined(DEBUG)
1200 #define dev_dbg(dev, format, arg...)            \
1201         dev_printk(KERN_DEBUG, dev, format, ##arg)
1202 #else
1203 #define dev_dbg(dev, format, arg...)                            \
1204 ({                                                              \
1205         if (0)                                                  \
1206                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
1207 })
1208 #endif
1209 
1210 #ifdef CONFIG_PRINTK
1211 #define dev_level_once(dev_level, dev, fmt, ...)                        \
1212 do {                                                                    \
1213         static bool __print_once __read_mostly;                         \
1214                                                                         \
1215         if (!__print_once) {                                            \
1216                 __print_once = true;                                    \
1217                 dev_level(dev, fmt, ##__VA_ARGS__);                     \
1218         }                                                               \
1219 } while (0)
1220 #else
1221 #define dev_level_once(dev_level, dev, fmt, ...)                        \
1222 do {                                                                    \
1223         if (0)                                                          \
1224                 dev_level(dev, fmt, ##__VA_ARGS__);                     \
1225 } while (0)
1226 #endif
1227 
1228 #define dev_emerg_once(dev, fmt, ...)                                   \
1229         dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1230 #define dev_alert_once(dev, fmt, ...)                                   \
1231         dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1232 #define dev_crit_once(dev, fmt, ...)                                    \
1233         dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1234 #define dev_err_once(dev, fmt, ...)                                     \
1235         dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1236 #define dev_warn_once(dev, fmt, ...)                                    \
1237         dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1238 #define dev_notice_once(dev, fmt, ...)                                  \
1239         dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1240 #define dev_info_once(dev, fmt, ...)                                    \
1241         dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1242 #define dev_dbg_once(dev, fmt, ...)                                     \
1243         dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1244 
1245 #define dev_level_ratelimited(dev_level, dev, fmt, ...)                 \
1246 do {                                                                    \
1247         static DEFINE_RATELIMIT_STATE(_rs,                              \
1248                                       DEFAULT_RATELIMIT_INTERVAL,       \
1249                                       DEFAULT_RATELIMIT_BURST);         \
1250         if (__ratelimit(&_rs))                                          \
1251                 dev_level(dev, fmt, ##__VA_ARGS__);                     \
1252 } while (0)
1253 
1254 #define dev_emerg_ratelimited(dev, fmt, ...)                            \
1255         dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1256 #define dev_alert_ratelimited(dev, fmt, ...)                            \
1257         dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1258 #define dev_crit_ratelimited(dev, fmt, ...)                             \
1259         dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1260 #define dev_err_ratelimited(dev, fmt, ...)                              \
1261         dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1262 #define dev_warn_ratelimited(dev, fmt, ...)                             \
1263         dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1264 #define dev_notice_ratelimited(dev, fmt, ...)                           \
1265         dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1266 #define dev_info_ratelimited(dev, fmt, ...)                             \
1267         dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1268 #if defined(CONFIG_DYNAMIC_DEBUG)
1269 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1270 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1271 do {                                                                    \
1272         static DEFINE_RATELIMIT_STATE(_rs,                              \
1273                                       DEFAULT_RATELIMIT_INTERVAL,       \
1274                                       DEFAULT_RATELIMIT_BURST);         \
1275         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
1276         if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) &&        \
1277             __ratelimit(&_rs))                                          \
1278                 __dynamic_dev_dbg(&descriptor, dev, fmt,                \
1279                                   ##__VA_ARGS__);                       \
1280 } while (0)
1281 #elif defined(DEBUG)
1282 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1283 do {                                                                    \
1284         static DEFINE_RATELIMIT_STATE(_rs,                              \
1285                                       DEFAULT_RATELIMIT_INTERVAL,       \
1286                                       DEFAULT_RATELIMIT_BURST);         \
1287         if (__ratelimit(&_rs))                                          \
1288                 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__);        \
1289 } while (0)
1290 #else
1291 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1292 do {                                                                    \
1293         if (0)                                                          \
1294                 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__);        \
1295 } while (0)
1296 #endif
1297 
1298 #ifdef VERBOSE_DEBUG
1299 #define dev_vdbg        dev_dbg
1300 #else
1301 #define dev_vdbg(dev, format, arg...)                           \
1302 ({                                                              \
1303         if (0)                                                  \
1304                 dev_printk(KERN_DEBUG, dev, format, ##arg);     \
1305 })
1306 #endif
1307 
1308 /*
1309  * dev_WARN*() acts like dev_printk(), but with the key difference of
1310  * using WARN/WARN_ONCE to include file/line information and a backtrace.
1311  */
1312 #define dev_WARN(dev, format, arg...) \
1313         WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1314 
1315 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1316         WARN_ONCE(condition, "%s %s: " format, \
1317                         dev_driver_string(dev), dev_name(dev), ## arg)
1318 
1319 /* Create alias, so I can be autoloaded. */
1320 #define MODULE_ALIAS_CHARDEV(major,minor) \
1321         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1322 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1323         MODULE_ALIAS("char-major-" __stringify(major) "-*")
1324 
1325 #ifdef CONFIG_SYSFS_DEPRECATED
1326 extern long sysfs_deprecated;
1327 #else
1328 #define sysfs_deprecated 0
1329 #endif
1330 
1331 /**
1332  * module_driver() - Helper macro for drivers that don't do anything
1333  * special in module init/exit. This eliminates a lot of boilerplate.
1334  * Each module may only use this macro once, and calling it replaces
1335  * module_init() and module_exit().
1336  *
1337  * @__driver: driver name
1338  * @__register: register function for this driver type
1339  * @__unregister: unregister function for this driver type
1340  * @...: Additional arguments to be passed to __register and __unregister.
1341  *
1342  * Use this macro to construct bus specific macros for registering
1343  * drivers, and do not use it on its own.
1344  */
1345 #define module_driver(__driver, __register, __unregister, ...) \
1346 static int __init __driver##_init(void) \
1347 { \
1348         return __register(&(__driver) , ##__VA_ARGS__); \
1349 } \
1350 module_init(__driver##_init); \
1351 static void __exit __driver##_exit(void) \
1352 { \
1353         __unregister(&(__driver) , ##__VA_ARGS__); \
1354 } \
1355 module_exit(__driver##_exit);
1356 
1357 /**
1358  * builtin_driver() - Helper macro for drivers that don't do anything
1359  * special in init and have no exit. This eliminates some boilerplate.
1360  * Each driver may only use this macro once, and calling it replaces
1361  * device_initcall (or in some cases, the legacy __initcall).  This is
1362  * meant to be a direct parallel of module_driver() above but without
1363  * the __exit stuff that is not used for builtin cases.
1364  *
1365  * @__driver: driver name
1366  * @__register: register function for this driver type
1367  * @...: Additional arguments to be passed to __register
1368  *
1369  * Use this macro to construct bus specific macros for registering
1370  * drivers, and do not use it on its own.
1371  */
1372 #define builtin_driver(__driver, __register, ...) \
1373 static int __init __driver##_init(void) \
1374 { \
1375         return __register(&(__driver) , ##__VA_ARGS__); \
1376 } \
1377 device_initcall(__driver##_init);
1378 
1379 #endif /* _DEVICE_H_ */
1380 

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