root/include/linux/device.h

INCLUDED FROM

DEFINITIONS

1. bus_find_device_by_name
2. bus_find_device_by_of_node
3. bus_find_device_by_fwnode
4. bus_find_device_by_devt
5. bus_find_next_device
6. bus_find_device_by_acpi_dev
7. bus_find_device_by_acpi_dev
8. driver_find_device_by_name
9. driver_find_device_by_of_node
10. driver_find_device_by_fwnode
11. driver_find_device_by_devt
12. driver_find_next_device
13. driver_find_device_by_acpi_dev
14. driver_find_device_by_acpi_dev
15. class_find_device_by_name
16. class_find_device_by_of_node
17. class_find_device_by_fwnode
18. class_find_device_by_devt
19. class_find_device_by_acpi_dev
20. class_find_device_by_acpi_dev
21. class_create_file
22. class_remove_file
23. devres_alloc_node
24. devm_kmalloc
25. devm_kmalloc_array
26. devm_kcalloc
27. devm_kstrdup
28. device_connections_add
29. device_connections_remove
30. kobj_to_dev
31. device_iommu_mapped
32. dev_name
33. __printf
34. set_dev_node
35. dev_to_node
36. set_dev_node
37. dev_get_msi_domain
38. dev_set_msi_domain
39. dev_get_drvdata
40. dev_set_drvdata
41. dev_to_psd
42. dev_get_uevent_suppress
43. dev_set_uevent_suppress
44. device_is_registered
45. device_enable_async_suspend
46. device_disable_async_suspend
47. device_async_suspend_enabled
48. device_pm_not_required
49. device_set_pm_not_required
50. dev_pm_syscore_device
51. dev_pm_set_driver_flags
52. dev_pm_test_driver_flags
53. device_lock
54. device_lock_interruptible
55. device_trylock
56. device_unlock
57. device_lock_assert
58. dev_of_node
59. device_supports_offline
60. dev_num_vf
61. dev_get_platdata
62. __printf
63. device_remove_group
64. devtmpfs_create_node
65. devtmpfs_delete_node
66. devtmpfs_mount
67. __printf
68. __printf
69. __dev_printk
70. __printf
71. __printf
72. __printf
73. __printf
74. __printf
75. __printf
76. __printf
77. __printf

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * device.h - generic, centralized driver model
   4  *
   5  * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
   6  * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
   7  * Copyright (c) 2008-2009 Novell Inc.
   8  *
   9  * See Documentation/driver-api/driver-model/ for more information.
  10  */
  11 
  12 #ifndef _DEVICE_H_
  13 #define _DEVICE_H_
  14 
  15 #include <linux/ioport.h>
  16 #include <linux/kobject.h>
  17 #include <linux/klist.h>
  18 #include <linux/list.h>
  19 #include <linux/lockdep.h>
  20 #include <linux/compiler.h>
  21 #include <linux/types.h>
  22 #include <linux/mutex.h>
  23 #include <linux/pm.h>
  24 #include <linux/atomic.h>
  25 #include <linux/ratelimit.h>
  26 #include <linux/uidgid.h>
  27 #include <linux/gfp.h>
  28 #include <linux/overflow.h>
  29 #include <asm/device.h>
  30 
  31 struct device;
  32 struct device_private;
  33 struct device_driver;
  34 struct driver_private;
  35 struct module;
  36 struct class;
  37 struct subsys_private;
  38 struct bus_type;
  39 struct device_node;
  40 struct fwnode_handle;
  41 struct iommu_ops;
  42 struct iommu_group;
  43 struct iommu_fwspec;
  44 struct dev_pin_info;
  45 struct iommu_param;
  46 
  47 struct bus_attribute {
  48         struct attribute        attr;
  49         ssize_t (*show)(struct bus_type *bus, char *buf);
  50         ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
  51 };
  52 
  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 #define BUS_ATTR_WO(_name) \
  58         struct bus_attribute bus_attr_##_name = __ATTR_WO(_name)
  59 
  60 extern int __must_check bus_create_file(struct bus_type *,
  61                                         struct bus_attribute *);
  62 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
  63 
  64 /**
  65  * struct bus_type - The bus type of the device
  66  *
  67  * @name:       The name of the bus.
  68  * @dev_name:   Used for subsystems to enumerate devices like ("foo%u", dev->id).
  69  * @dev_root:   Default device to use as the parent.
  70  * @bus_groups: Default attributes of the bus.
  71  * @dev_groups: Default attributes of the devices on the bus.
  72  * @drv_groups: Default attributes of the device drivers on the bus.
  73  * @match:      Called, perhaps multiple times, whenever a new device or driver
  74  *              is added for this bus. It should return a positive value if the
  75  *              given device can be handled by the given driver and zero
  76  *              otherwise. It may also return error code if determining that
  77  *              the driver supports the device is not possible. In case of
  78  *              -EPROBE_DEFER it will queue the device for deferred probing.
  79  * @uevent:     Called when a device is added, removed, or a few other things
  80  *              that generate uevents to add the environment variables.
  81  * @probe:      Called when a new device or driver add to this bus, and callback
  82  *              the specific driver's probe to initial the matched device.
  83  * @remove:     Called when a device removed from this bus.
  84  * @shutdown:   Called at shut-down time to quiesce the device.
  85  *
  86  * @online:     Called to put the device back online (after offlining it).
  87  * @offline:    Called to put the device offline for hot-removal. May fail.
  88  *
  89  * @suspend:    Called when a device on this bus wants to go to sleep mode.
  90  * @resume:     Called to bring a device on this bus out of sleep mode.
  91  * @num_vf:     Called to find out how many virtual functions a device on this
  92  *              bus supports.
  93  * @dma_configure:      Called to setup DMA configuration on a device on
  94  *                      this bus.
  95  * @pm:         Power management operations of this bus, callback the specific
  96  *              device driver's pm-ops.
  97  * @iommu_ops:  IOMMU specific operations for this bus, used to attach IOMMU
  98  *              driver implementations to a bus and allow the driver to do
  99  *              bus-specific setup
 100  * @p:          The private data of the driver core, only the driver core can
 101  *              touch this.
 102  * @lock_key:   Lock class key for use by the lock validator
 103  * @need_parent_lock:   When probing or removing a device on this bus, the
 104  *                      device core should lock the device's parent.
 105  *
 106  * A bus is a channel between the processor and one or more devices. For the
 107  * purposes of the device model, all devices are connected via a bus, even if
 108  * it is an internal, virtual, "platform" bus. Buses can plug into each other.
 109  * A USB controller is usually a PCI device, for example. The device model
 110  * represents the actual connections between buses and the devices they control.
 111  * A bus is represented by the bus_type structure. It contains the name, the
 112  * default attributes, the bus' methods, PM operations, and the driver core's
 113  * private data.
 114  */
 115 struct bus_type {
 116         const char              *name;
 117         const char              *dev_name;
 118         struct device           *dev_root;
 119         const struct attribute_group **bus_groups;
 120         const struct attribute_group **dev_groups;
 121         const struct attribute_group **drv_groups;
 122 
 123         int (*match)(struct device *dev, struct device_driver *drv);
 124         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 125         int (*probe)(struct device *dev);
 126         int (*remove)(struct device *dev);
 127         void (*shutdown)(struct device *dev);
 128 
 129         int (*online)(struct device *dev);
 130         int (*offline)(struct device *dev);
 131 
 132         int (*suspend)(struct device *dev, pm_message_t state);
 133         int (*resume)(struct device *dev);
 134 
 135         int (*num_vf)(struct device *dev);
 136 
 137         int (*dma_configure)(struct device *dev);
 138 
 139         const struct dev_pm_ops *pm;
 140 
 141         const struct iommu_ops *iommu_ops;
 142 
 143         struct subsys_private *p;
 144         struct lock_class_key lock_key;
 145 
 146         bool need_parent_lock;
 147 };
 148 
 149 extern int __must_check bus_register(struct bus_type *bus);
 150 
 151 extern void bus_unregister(struct bus_type *bus);
 152 
 153 extern int __must_check bus_rescan_devices(struct bus_type *bus);
 154 
 155 /* iterator helpers for buses */
 156 struct subsys_dev_iter {
 157         struct klist_iter               ki;
 158         const struct device_type        *type;
 159 };
 160 void subsys_dev_iter_init(struct subsys_dev_iter *iter,
 161                          struct bus_type *subsys,
 162                          struct device *start,
 163                          const struct device_type *type);
 164 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
 165 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
 166 
 167 int device_match_name(struct device *dev, const void *name);
 168 int device_match_of_node(struct device *dev, const void *np);
 169 int device_match_fwnode(struct device *dev, const void *fwnode);
 170 int device_match_devt(struct device *dev, const void *pdevt);
 171 int device_match_acpi_dev(struct device *dev, const void *adev);
 172 int device_match_any(struct device *dev, const void *unused);
 173 
 174 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
 175                      int (*fn)(struct device *dev, void *data));
 176 struct device *bus_find_device(struct bus_type *bus, struct device *start,
 177                                const void *data,
 178                                int (*match)(struct device *dev, const void *data));
 179 /**
 180  * bus_find_device_by_name - device iterator for locating a particular device
 181  * of a specific name.
 182  * @bus: bus type
 183  * @start: Device to begin with
 184  * @name: name of the device to match
 185  */
 186 static inline struct device *bus_find_device_by_name(struct bus_type *bus,
 187                                                      struct device *start,
 188                                                      const char *name)
 189 {
 190         return bus_find_device(bus, start, name, device_match_name);
 191 }
 192 
 193 /**
 194  * bus_find_device_by_of_node : device iterator for locating a particular device
 195  * matching the of_node.
 196  * @bus: bus type
 197  * @np: of_node of the device to match.
 198  */
 199 static inline struct device *
 200 bus_find_device_by_of_node(struct bus_type *bus, const struct device_node *np)
 201 {
 202         return bus_find_device(bus, NULL, np, device_match_of_node);
 203 }
 204 
 205 /**
 206  * bus_find_device_by_fwnode : device iterator for locating a particular device
 207  * matching the fwnode.
 208  * @bus: bus type
 209  * @fwnode: fwnode of the device to match.
 210  */
 211 static inline struct device *
 212 bus_find_device_by_fwnode(struct bus_type *bus, const struct fwnode_handle *fwnode)
 213 {
 214         return bus_find_device(bus, NULL, fwnode, device_match_fwnode);
 215 }
 216 
 217 /**
 218  * bus_find_device_by_devt : device iterator for locating a particular device
 219  * matching the device type.
 220  * @bus: bus type
 221  * @devt: device type of the device to match.
 222  */
 223 static inline struct device *bus_find_device_by_devt(struct bus_type *bus,
 224                                                      dev_t devt)
 225 {
 226         return bus_find_device(bus, NULL, &devt, device_match_devt);
 227 }
 228 
 229 /**
 230  * bus_find_next_device - Find the next device after a given device in a
 231  * given bus.
 232  * @bus: bus type
 233  * @cur: device to begin the search with.
 234  */
 235 static inline struct device *
 236 bus_find_next_device(struct bus_type *bus,struct device *cur)
 237 {
 238         return bus_find_device(bus, cur, NULL, device_match_any);
 239 }
 240 
 241 #ifdef CONFIG_ACPI
 242 struct acpi_device;
 243 
 244 /**
 245  * bus_find_device_by_acpi_dev : device iterator for locating a particular device
 246  * matching the ACPI COMPANION device.
 247  * @bus: bus type
 248  * @adev: ACPI COMPANION device to match.
 249  */
 250 static inline struct device *
 251 bus_find_device_by_acpi_dev(struct bus_type *bus, const struct acpi_device *adev)
 252 {
 253         return bus_find_device(bus, NULL, adev, device_match_acpi_dev);
 254 }
 255 #else
 256 static inline struct device *
 257 bus_find_device_by_acpi_dev(struct bus_type *bus, const void *adev)
 258 {
 259         return NULL;
 260 }
 261 #endif
 262 
 263 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
 264                                         struct device *hint);
 265 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
 266                      void *data, int (*fn)(struct device_driver *, void *));
 267 void bus_sort_breadthfirst(struct bus_type *bus,
 268                            int (*compare)(const struct device *a,
 269                                           const struct device *b));
 270 /*
 271  * Bus notifiers: Get notified of addition/removal of devices
 272  * and binding/unbinding of drivers to devices.
 273  * In the long run, it should be a replacement for the platform
 274  * notify hooks.
 275  */
 276 struct notifier_block;
 277 
 278 extern int bus_register_notifier(struct bus_type *bus,
 279                                  struct notifier_block *nb);
 280 extern int bus_unregister_notifier(struct bus_type *bus,
 281                                    struct notifier_block *nb);
 282 
 283 /* All 4 notifers below get called with the target struct device *
 284  * as an argument. Note that those functions are likely to be called
 285  * with the device lock held in the core, so be careful.
 286  */
 287 #define BUS_NOTIFY_ADD_DEVICE           0x00000001 /* device added */
 288 #define BUS_NOTIFY_DEL_DEVICE           0x00000002 /* device to be removed */
 289 #define BUS_NOTIFY_REMOVED_DEVICE       0x00000003 /* device removed */
 290 #define BUS_NOTIFY_BIND_DRIVER          0x00000004 /* driver about to be
 291                                                       bound */
 292 #define BUS_NOTIFY_BOUND_DRIVER         0x00000005 /* driver bound to device */
 293 #define BUS_NOTIFY_UNBIND_DRIVER        0x00000006 /* driver about to be
 294                                                       unbound */
 295 #define BUS_NOTIFY_UNBOUND_DRIVER       0x00000007 /* driver is unbound
 296                                                       from the device */
 297 #define BUS_NOTIFY_DRIVER_NOT_BOUND     0x00000008 /* driver fails to be bound */
 298 
 299 extern struct kset *bus_get_kset(struct bus_type *bus);
 300 extern struct klist *bus_get_device_klist(struct bus_type *bus);
 301 
 302 /**
 303  * enum probe_type - device driver probe type to try
 304  *      Device drivers may opt in for special handling of their
 305  *      respective probe routines. This tells the core what to
 306  *      expect and prefer.
 307  *
 308  * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
 309  *      whether probed synchronously or asynchronously.
 310  * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
 311  *      probing order is not essential for booting the system may
 312  *      opt into executing their probes asynchronously.
 313  * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
 314  *      their probe routines to run synchronously with driver and
 315  *      device registration (with the exception of -EPROBE_DEFER
 316  *      handling - re-probing always ends up being done asynchronously).
 317  *
 318  * Note that the end goal is to switch the kernel to use asynchronous
 319  * probing by default, so annotating drivers with
 320  * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
 321  * to speed up boot process while we are validating the rest of the
 322  * drivers.
 323  */
 324 enum probe_type {
 325         PROBE_DEFAULT_STRATEGY,
 326         PROBE_PREFER_ASYNCHRONOUS,
 327         PROBE_FORCE_SYNCHRONOUS,
 328 };
 329 
 330 /**
 331  * struct device_driver - The basic device driver structure
 332  * @name:       Name of the device driver.
 333  * @bus:        The bus which the device of this driver belongs to.
 334  * @owner:      The module owner.
 335  * @mod_name:   Used for built-in modules.
 336  * @suppress_bind_attrs: Disables bind/unbind via sysfs.
 337  * @probe_type: Type of the probe (synchronous or asynchronous) to use.
 338  * @of_match_table: The open firmware table.
 339  * @acpi_match_table: The ACPI match table.
 340  * @probe:      Called to query the existence of a specific device,
 341  *              whether this driver can work with it, and bind the driver
 342  *              to a specific device.
 343  * @remove:     Called when the device is removed from the system to
 344  *              unbind a device from this driver.
 345  * @shutdown:   Called at shut-down time to quiesce the device.
 346  * @suspend:    Called to put the device to sleep mode. Usually to a
 347  *              low power state.
 348  * @resume:     Called to bring a device from sleep mode.
 349  * @groups:     Default attributes that get created by the driver core
 350  *              automatically.
 351  * @dev_groups: Additional attributes attached to device instance once the
 352  *              it is bound to the driver.
 353  * @pm:         Power management operations of the device which matched
 354  *              this driver.
 355  * @coredump:   Called when sysfs entry is written to. The device driver
 356  *              is expected to call the dev_coredump API resulting in a
 357  *              uevent.
 358  * @p:          Driver core's private data, no one other than the driver
 359  *              core can touch this.
 360  *
 361  * The device driver-model tracks all of the drivers known to the system.
 362  * The main reason for this tracking is to enable the driver core to match
 363  * up drivers with new devices. Once drivers are known objects within the
 364  * system, however, a number of other things become possible. Device drivers
 365  * can export information and configuration variables that are independent
 366  * of any specific device.
 367  */
 368 struct device_driver {
 369         const char              *name;
 370         struct bus_type         *bus;
 371 
 372         struct module           *owner;
 373         const char              *mod_name;      /* used for built-in modules */
 374 
 375         bool suppress_bind_attrs;       /* disables bind/unbind via sysfs */
 376         enum probe_type probe_type;
 377 
 378         const struct of_device_id       *of_match_table;
 379         const struct acpi_device_id     *acpi_match_table;
 380 
 381         int (*probe) (struct device *dev);
 382         int (*remove) (struct device *dev);
 383         void (*shutdown) (struct device *dev);
 384         int (*suspend) (struct device *dev, pm_message_t state);
 385         int (*resume) (struct device *dev);
 386         const struct attribute_group **groups;
 387         const struct attribute_group **dev_groups;
 388 
 389         const struct dev_pm_ops *pm;
 390         void (*coredump) (struct device *dev);
 391 
 392         struct driver_private *p;
 393 };
 394 
 395 
 396 extern int __must_check driver_register(struct device_driver *drv);
 397 extern void driver_unregister(struct device_driver *drv);
 398 
 399 extern struct device_driver *driver_find(const char *name,
 400                                          struct bus_type *bus);
 401 extern int driver_probe_done(void);
 402 extern void wait_for_device_probe(void);
 403 
 404 /* sysfs interface for exporting driver attributes */
 405 
 406 struct driver_attribute {
 407         struct attribute attr;
 408         ssize_t (*show)(struct device_driver *driver, char *buf);
 409         ssize_t (*store)(struct device_driver *driver, const char *buf,
 410                          size_t count);
 411 };
 412 
 413 #define DRIVER_ATTR_RW(_name) \
 414         struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
 415 #define DRIVER_ATTR_RO(_name) \
 416         struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
 417 #define DRIVER_ATTR_WO(_name) \
 418         struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
 419 
 420 extern int __must_check driver_create_file(struct device_driver *driver,
 421                                         const struct driver_attribute *attr);
 422 extern void driver_remove_file(struct device_driver *driver,
 423                                const struct driver_attribute *attr);
 424 
 425 extern int __must_check driver_for_each_device(struct device_driver *drv,
 426                                                struct device *start,
 427                                                void *data,
 428                                                int (*fn)(struct device *dev,
 429                                                          void *));
 430 struct device *driver_find_device(struct device_driver *drv,
 431                                   struct device *start, const void *data,
 432                                   int (*match)(struct device *dev, const void *data));
 433 
 434 /**
 435  * driver_find_device_by_name - device iterator for locating a particular device
 436  * of a specific name.
 437  * @drv: the driver we're iterating
 438  * @name: name of the device to match
 439  */
 440 static inline struct device *driver_find_device_by_name(struct device_driver *drv,
 441                                                         const char *name)
 442 {
 443         return driver_find_device(drv, NULL, name, device_match_name);
 444 }
 445 
 446 /**
 447  * driver_find_device_by_of_node- device iterator for locating a particular device
 448  * by of_node pointer.
 449  * @drv: the driver we're iterating
 450  * @np: of_node pointer to match.
 451  */
 452 static inline struct device *
 453 driver_find_device_by_of_node(struct device_driver *drv,
 454                               const struct device_node *np)
 455 {
 456         return driver_find_device(drv, NULL, np, device_match_of_node);
 457 }
 458 
 459 /**
 460  * driver_find_device_by_fwnode- device iterator for locating a particular device
 461  * by fwnode pointer.
 462  * @drv: the driver we're iterating
 463  * @fwnode: fwnode pointer to match.
 464  */
 465 static inline struct device *
 466 driver_find_device_by_fwnode(struct device_driver *drv,
 467                              const struct fwnode_handle *fwnode)
 468 {
 469         return driver_find_device(drv, NULL, fwnode, device_match_fwnode);
 470 }
 471 
 472 /**
 473  * driver_find_device_by_devt- device iterator for locating a particular device
 474  * by devt.
 475  * @drv: the driver we're iterating
 476  * @devt: devt pointer to match.
 477  */
 478 static inline struct device *driver_find_device_by_devt(struct device_driver *drv,
 479                                                         dev_t devt)
 480 {
 481         return driver_find_device(drv, NULL, &devt, device_match_devt);
 482 }
 483 
 484 static inline struct device *driver_find_next_device(struct device_driver *drv,
 485                                                      struct device *start)
 486 {
 487         return driver_find_device(drv, start, NULL, device_match_any);
 488 }
 489 
 490 #ifdef CONFIG_ACPI
 491 /**
 492  * driver_find_device_by_acpi_dev : device iterator for locating a particular
 493  * device matching the ACPI_COMPANION device.
 494  * @drv: the driver we're iterating
 495  * @adev: ACPI_COMPANION device to match.
 496  */
 497 static inline struct device *
 498 driver_find_device_by_acpi_dev(struct device_driver *drv,
 499                                const struct acpi_device *adev)
 500 {
 501         return driver_find_device(drv, NULL, adev, device_match_acpi_dev);
 502 }
 503 #else
 504 static inline struct device *
 505 driver_find_device_by_acpi_dev(struct device_driver *drv, const void *adev)
 506 {
 507         return NULL;
 508 }
 509 #endif
 510 
 511 void driver_deferred_probe_add(struct device *dev);
 512 int driver_deferred_probe_check_state(struct device *dev);
 513 int driver_deferred_probe_check_state_continue(struct device *dev);
 514 
 515 /**
 516  * struct subsys_interface - interfaces to device functions
 517  * @name:       name of the device function
 518  * @subsys:     subsytem of the devices to attach to
 519  * @node:       the list of functions registered at the subsystem
 520  * @add_dev:    device hookup to device function handler
 521  * @remove_dev: device hookup to device function handler
 522  *
 523  * Simple interfaces attached to a subsystem. Multiple interfaces can
 524  * attach to a subsystem and its devices. Unlike drivers, they do not
 525  * exclusively claim or control devices. Interfaces usually represent
 526  * a specific functionality of a subsystem/class of devices.
 527  */
 528 struct subsys_interface {
 529         const char *name;
 530         struct bus_type *subsys;
 531         struct list_head node;
 532         int (*add_dev)(struct device *dev, struct subsys_interface *sif);
 533         void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
 534 };
 535 
 536 int subsys_interface_register(struct subsys_interface *sif);
 537 void subsys_interface_unregister(struct subsys_interface *sif);
 538 
 539 int subsys_system_register(struct bus_type *subsys,
 540                            const struct attribute_group **groups);
 541 int subsys_virtual_register(struct bus_type *subsys,
 542                             const struct attribute_group **groups);
 543 
 544 /**
 545  * struct class - device classes
 546  * @name:       Name of the class.
 547  * @owner:      The module owner.
 548  * @class_groups: Default attributes of this class.
 549  * @dev_groups: Default attributes of the devices that belong to the class.
 550  * @dev_kobj:   The kobject that represents this class and links it into the hierarchy.
 551  * @dev_uevent: Called when a device is added, removed from this class, or a
 552  *              few other things that generate uevents to add the environment
 553  *              variables.
 554  * @devnode:    Callback to provide the devtmpfs.
 555  * @class_release: Called to release this class.
 556  * @dev_release: Called to release the device.
 557  * @shutdown_pre: Called at shut-down time before driver shutdown.
 558  * @ns_type:    Callbacks so sysfs can detemine namespaces.
 559  * @namespace:  Namespace of the device belongs to this class.
 560  * @get_ownership: Allows class to specify uid/gid of the sysfs directories
 561  *              for the devices belonging to the class. Usually tied to
 562  *              device's namespace.
 563  * @pm:         The default device power management operations of this class.
 564  * @p:          The private data of the driver core, no one other than the
 565  *              driver core can touch this.
 566  *
 567  * A class is a higher-level view of a device that abstracts out low-level
 568  * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
 569  * at the class level, they are all simply disks. Classes allow user space
 570  * to work with devices based on what they do, rather than how they are
 571  * connected or how they work.
 572  */
 573 struct class {
 574         const char              *name;
 575         struct module           *owner;
 576 
 577         const struct attribute_group    **class_groups;
 578         const struct attribute_group    **dev_groups;
 579         struct kobject                  *dev_kobj;
 580 
 581         int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
 582         char *(*devnode)(struct device *dev, umode_t *mode);
 583 
 584         void (*class_release)(struct class *class);
 585         void (*dev_release)(struct device *dev);
 586 
 587         int (*shutdown_pre)(struct device *dev);
 588 
 589         const struct kobj_ns_type_operations *ns_type;
 590         const void *(*namespace)(struct device *dev);
 591 
 592         void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid);
 593 
 594         const struct dev_pm_ops *pm;
 595 
 596         struct subsys_private *p;
 597 };
 598 
 599 struct class_dev_iter {
 600         struct klist_iter               ki;
 601         const struct device_type        *type;
 602 };
 603 
 604 extern struct kobject *sysfs_dev_block_kobj;
 605 extern struct kobject *sysfs_dev_char_kobj;
 606 extern int __must_check __class_register(struct class *class,
 607                                          struct lock_class_key *key);
 608 extern void class_unregister(struct class *class);
 609 
 610 /* This is a #define to keep the compiler from merging different
 611  * instances of the __key variable */
 612 #define class_register(class)                   \
 613 ({                                              \
 614         static struct lock_class_key __key;     \
 615         __class_register(class, &__key);        \
 616 })
 617 
 618 struct class_compat;
 619 struct class_compat *class_compat_register(const char *name);
 620 void class_compat_unregister(struct class_compat *cls);
 621 int class_compat_create_link(struct class_compat *cls, struct device *dev,
 622                              struct device *device_link);
 623 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
 624                               struct device *device_link);
 625 
 626 extern void class_dev_iter_init(struct class_dev_iter *iter,
 627                                 struct class *class,
 628                                 struct device *start,
 629                                 const struct device_type *type);
 630 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
 631 extern void class_dev_iter_exit(struct class_dev_iter *iter);
 632 
 633 extern int class_for_each_device(struct class *class, struct device *start,
 634                                  void *data,
 635                                  int (*fn)(struct device *dev, void *data));
 636 extern struct device *class_find_device(struct class *class,
 637                                         struct device *start, const void *data,
 638                                         int (*match)(struct device *, const void *));
 639 
 640 /**
 641  * class_find_device_by_name - device iterator for locating a particular device
 642  * of a specific name.
 643  * @class: class type
 644  * @name: name of the device to match
 645  */
 646 static inline struct device *class_find_device_by_name(struct class *class,
 647                                                        const char *name)
 648 {
 649         return class_find_device(class, NULL, name, device_match_name);
 650 }
 651 
 652 /**
 653  * class_find_device_by_of_node : device iterator for locating a particular device
 654  * matching the of_node.
 655  * @class: class type
 656  * @np: of_node of the device to match.
 657  */
 658 static inline struct device *
 659 class_find_device_by_of_node(struct class *class, const struct device_node *np)
 660 {
 661         return class_find_device(class, NULL, np, device_match_of_node);
 662 }
 663 
 664 /**
 665  * class_find_device_by_fwnode : device iterator for locating a particular device
 666  * matching the fwnode.
 667  * @class: class type
 668  * @fwnode: fwnode of the device to match.
 669  */
 670 static inline struct device *
 671 class_find_device_by_fwnode(struct class *class,
 672                             const struct fwnode_handle *fwnode)
 673 {
 674         return class_find_device(class, NULL, fwnode, device_match_fwnode);
 675 }
 676 
 677 /**
 678  * class_find_device_by_devt : device iterator for locating a particular device
 679  * matching the device type.
 680  * @class: class type
 681  * @devt: device type of the device to match.
 682  */
 683 static inline struct device *class_find_device_by_devt(struct class *class,
 684                                                        dev_t devt)
 685 {
 686         return class_find_device(class, NULL, &devt, device_match_devt);
 687 }
 688 
 689 #ifdef CONFIG_ACPI
 690 struct acpi_device;
 691 /**
 692  * class_find_device_by_acpi_dev : device iterator for locating a particular
 693  * device matching the ACPI_COMPANION device.
 694  * @class: class type
 695  * @adev: ACPI_COMPANION device to match.
 696  */
 697 static inline struct device *
 698 class_find_device_by_acpi_dev(struct class *class, const struct acpi_device *adev)
 699 {
 700         return class_find_device(class, NULL, adev, device_match_acpi_dev);
 701 }
 702 #else
 703 static inline struct device *
 704 class_find_device_by_acpi_dev(struct class *class, const void *adev)
 705 {
 706         return NULL;
 707 }
 708 #endif
 709 
 710 struct class_attribute {
 711         struct attribute attr;
 712         ssize_t (*show)(struct class *class, struct class_attribute *attr,
 713                         char *buf);
 714         ssize_t (*store)(struct class *class, struct class_attribute *attr,
 715                         const char *buf, size_t count);
 716 };
 717 
 718 #define CLASS_ATTR_RW(_name) \
 719         struct class_attribute class_attr_##_name = __ATTR_RW(_name)
 720 #define CLASS_ATTR_RO(_name) \
 721         struct class_attribute class_attr_##_name = __ATTR_RO(_name)
 722 #define CLASS_ATTR_WO(_name) \
 723         struct class_attribute class_attr_##_name = __ATTR_WO(_name)
 724 
 725 extern int __must_check class_create_file_ns(struct class *class,
 726                                              const struct class_attribute *attr,
 727                                              const void *ns);
 728 extern void class_remove_file_ns(struct class *class,
 729                                  const struct class_attribute *attr,
 730                                  const void *ns);
 731 
 732 static inline int __must_check class_create_file(struct class *class,
 733                                         const struct class_attribute *attr)
 734 {
 735         return class_create_file_ns(class, attr, NULL);
 736 }
 737 
 738 static inline void class_remove_file(struct class *class,
 739                                      const struct class_attribute *attr)
 740 {
 741         return class_remove_file_ns(class, attr, NULL);
 742 }
 743 
 744 /* Simple class attribute that is just a static string */
 745 struct class_attribute_string {
 746         struct class_attribute attr;
 747         char *str;
 748 };
 749 
 750 /* Currently read-only only */
 751 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
 752         { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
 753 #define CLASS_ATTR_STRING(_name, _mode, _str) \
 754         struct class_attribute_string class_attr_##_name = \
 755                 _CLASS_ATTR_STRING(_name, _mode, _str)
 756 
 757 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
 758                         char *buf);
 759 
 760 struct class_interface {
 761         struct list_head        node;
 762         struct class            *class;
 763 
 764         int (*add_dev)          (struct device *, struct class_interface *);
 765         void (*remove_dev)      (struct device *, struct class_interface *);
 766 };
 767 
 768 extern int __must_check class_interface_register(struct class_interface *);
 769 extern void class_interface_unregister(struct class_interface *);
 770 
 771 extern struct class * __must_check __class_create(struct module *owner,
 772                                                   const char *name,
 773                                                   struct lock_class_key *key);
 774 extern void class_destroy(struct class *cls);
 775 
 776 /* This is a #define to keep the compiler from merging different
 777  * instances of the __key variable */
 778 #define class_create(owner, name)               \
 779 ({                                              \
 780         static struct lock_class_key __key;     \
 781         __class_create(owner, name, &__key);    \
 782 })
 783 
 784 /*
 785  * The type of device, "struct device" is embedded in. A class
 786  * or bus can contain devices of different types
 787  * like "partitions" and "disks", "mouse" and "event".
 788  * This identifies the device type and carries type-specific
 789  * information, equivalent to the kobj_type of a kobject.
 790  * If "name" is specified, the uevent will contain it in
 791  * the DEVTYPE variable.
 792  */
 793 struct device_type {
 794         const char *name;
 795         const struct attribute_group **groups;
 796         int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
 797         char *(*devnode)(struct device *dev, umode_t *mode,
 798                          kuid_t *uid, kgid_t *gid);
 799         void (*release)(struct device *dev);
 800 
 801         const struct dev_pm_ops *pm;
 802 };
 803 
 804 /* interface for exporting device attributes */
 805 struct device_attribute {
 806         struct attribute        attr;
 807         ssize_t (*show)(struct device *dev, struct device_attribute *attr,
 808                         char *buf);
 809         ssize_t (*store)(struct device *dev, struct device_attribute *attr,
 810                          const char *buf, size_t count);
 811 };
 812 
 813 struct dev_ext_attribute {
 814         struct device_attribute attr;
 815         void *var;
 816 };
 817 
 818 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
 819                           char *buf);
 820 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
 821                            const char *buf, size_t count);
 822 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
 823                         char *buf);
 824 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
 825                          const char *buf, size_t count);
 826 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
 827                         char *buf);
 828 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
 829                          const char *buf, size_t count);
 830 
 831 #define DEVICE_ATTR(_name, _mode, _show, _store) \
 832         struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
 833 #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
 834         struct device_attribute dev_attr_##_name = \
 835                 __ATTR_PREALLOC(_name, _mode, _show, _store)
 836 #define DEVICE_ATTR_RW(_name) \
 837         struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
 838 #define DEVICE_ATTR_RO(_name) \
 839         struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
 840 #define DEVICE_ATTR_WO(_name) \
 841         struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
 842 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
 843         struct dev_ext_attribute dev_attr_##_name = \
 844                 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
 845 #define DEVICE_INT_ATTR(_name, _mode, _var) \
 846         struct dev_ext_attribute dev_attr_##_name = \
 847                 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
 848 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
 849         struct dev_ext_attribute dev_attr_##_name = \
 850                 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
 851 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
 852         struct device_attribute dev_attr_##_name =              \
 853                 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
 854 
 855 extern int device_create_file(struct device *device,
 856                               const struct device_attribute *entry);
 857 extern void device_remove_file(struct device *dev,
 858                                const struct device_attribute *attr);
 859 extern bool device_remove_file_self(struct device *dev,
 860                                     const struct device_attribute *attr);
 861 extern int __must_check device_create_bin_file(struct device *dev,
 862                                         const struct bin_attribute *attr);
 863 extern void device_remove_bin_file(struct device *dev,
 864                                    const struct bin_attribute *attr);
 865 
 866 /* device resource management */
 867 typedef void (*dr_release_t)(struct device *dev, void *res);
 868 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
 869 
 870 #ifdef CONFIG_DEBUG_DEVRES
 871 extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
 872                                  int nid, const char *name) __malloc;
 873 #define devres_alloc(release, size, gfp) \
 874         __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
 875 #define devres_alloc_node(release, size, gfp, nid) \
 876         __devres_alloc_node(release, size, gfp, nid, #release)
 877 #else
 878 extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
 879                                int nid) __malloc;
 880 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
 881 {
 882         return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
 883 }
 884 #endif
 885 
 886 extern void devres_for_each_res(struct device *dev, dr_release_t release,
 887                                 dr_match_t match, void *match_data,
 888                                 void (*fn)(struct device *, void *, void *),
 889                                 void *data);
 890 extern void devres_free(void *res);
 891 extern void devres_add(struct device *dev, void *res);
 892 extern void *devres_find(struct device *dev, dr_release_t release,
 893                          dr_match_t match, void *match_data);
 894 extern void *devres_get(struct device *dev, void *new_res,
 895                         dr_match_t match, void *match_data);
 896 extern void *devres_remove(struct device *dev, dr_release_t release,
 897                            dr_match_t match, void *match_data);
 898 extern int devres_destroy(struct device *dev, dr_release_t release,
 899                           dr_match_t match, void *match_data);
 900 extern int devres_release(struct device *dev, dr_release_t release,
 901                           dr_match_t match, void *match_data);
 902 
 903 /* devres group */
 904 extern void * __must_check devres_open_group(struct device *dev, void *id,
 905                                              gfp_t gfp);
 906 extern void devres_close_group(struct device *dev, void *id);
 907 extern void devres_remove_group(struct device *dev, void *id);
 908 extern int devres_release_group(struct device *dev, void *id);
 909 
 910 /* managed devm_k.alloc/kfree for device drivers */
 911 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
 912 extern __printf(3, 0)
 913 char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
 914                       va_list ap) __malloc;
 915 extern __printf(3, 4)
 916 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
 917 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
 918 {
 919         return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
 920 }
 921 static inline void *devm_kmalloc_array(struct device *dev,
 922                                        size_t n, size_t size, gfp_t flags)
 923 {
 924         size_t bytes;
 925 
 926         if (unlikely(check_mul_overflow(n, size, &bytes)))
 927                 return NULL;
 928 
 929         return devm_kmalloc(dev, bytes, flags);
 930 }
 931 static inline void *devm_kcalloc(struct device *dev,
 932                                  size_t n, size_t size, gfp_t flags)
 933 {
 934         return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
 935 }
 936 extern void devm_kfree(struct device *dev, const void *p);
 937 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
 938 extern const char *devm_kstrdup_const(struct device *dev,
 939                                       const char *s, gfp_t gfp);
 940 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
 941                           gfp_t gfp);
 942 
 943 extern unsigned long devm_get_free_pages(struct device *dev,
 944                                          gfp_t gfp_mask, unsigned int order);
 945 extern void devm_free_pages(struct device *dev, unsigned long addr);
 946 
 947 void __iomem *devm_ioremap_resource(struct device *dev,
 948                                     const struct resource *res);
 949 
 950 void __iomem *devm_of_iomap(struct device *dev,
 951                             struct device_node *node, int index,
 952                             resource_size_t *size);
 953 
 954 /* allows to add/remove a custom action to devres stack */
 955 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
 956 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
 957 void devm_release_action(struct device *dev, void (*action)(void *), void *data);
 958 
 959 static inline int devm_add_action_or_reset(struct device *dev,
 960                                            void (*action)(void *), void *data)
 961 {
 962         int ret;
 963 
 964         ret = devm_add_action(dev, action, data);
 965         if (ret)
 966                 action(data);
 967 
 968         return ret;
 969 }
 970 
 971 /**
 972  * devm_alloc_percpu - Resource-managed alloc_percpu
 973  * @dev: Device to allocate per-cpu memory for
 974  * @type: Type to allocate per-cpu memory for
 975  *
 976  * Managed alloc_percpu. Per-cpu memory allocated with this function is
 977  * automatically freed on driver detach.
 978  *
 979  * RETURNS:
 980  * Pointer to allocated memory on success, NULL on failure.
 981  */
 982 #define devm_alloc_percpu(dev, type)      \
 983         ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
 984                                                       __alignof__(type)))
 985 
 986 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
 987                                    size_t align);
 988 void devm_free_percpu(struct device *dev, void __percpu *pdata);
 989 
 990 struct device_dma_parameters {
 991         /*
 992          * a low level driver may set these to teach IOMMU code about
 993          * sg limitations.
 994          */
 995         unsigned int max_segment_size;
 996         unsigned long segment_boundary_mask;
 997 };
 998 
 999 /**
1000  * struct device_connection - Device Connection Descriptor
1001  * @fwnode: The device node of the connected device
1002  * @endpoint: The names of the two devices connected together
1003  * @id: Unique identifier for the connection
1004  * @list: List head, private, for internal use only
1005  *
1006  * NOTE: @fwnode is not used together with @endpoint. @fwnode is used when
1007  * platform firmware defines the connection. When the connection is registered
1008  * with device_connection_add() @endpoint is used instead.
1009  */
1010 struct device_connection {
1011         struct fwnode_handle    *fwnode;
1012         const char              *endpoint[2];
1013         const char              *id;
1014         struct list_head        list;
1015 };
1016 
1017 typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
1018                                    void *data);
1019 
1020 void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
1021                                    const char *con_id, void *data,
1022                                    devcon_match_fn_t match);
1023 void *device_connection_find_match(struct device *dev, const char *con_id,
1024                                    void *data, devcon_match_fn_t match);
1025 
1026 struct device *device_connection_find(struct device *dev, const char *con_id);
1027 
1028 void device_connection_add(struct device_connection *con);
1029 void device_connection_remove(struct device_connection *con);
1030 
1031 /**
1032  * device_connections_add - Add multiple device connections at once
1033  * @cons: Zero terminated array of device connection descriptors
1034  */
1035 static inline void device_connections_add(struct device_connection *cons)
1036 {
1037         struct device_connection *c;
1038 
1039         for (c = cons; c->endpoint[0]; c++)
1040                 device_connection_add(c);
1041 }
1042 
1043 /**
1044  * device_connections_remove - Remove multiple device connections at once
1045  * @cons: Zero terminated array of device connection descriptors
1046  */
1047 static inline void device_connections_remove(struct device_connection *cons)
1048 {
1049         struct device_connection *c;
1050 
1051         for (c = cons; c->endpoint[0]; c++)
1052                 device_connection_remove(c);
1053 }
1054 
1055 /**
1056  * enum device_link_state - Device link states.
1057  * @DL_STATE_NONE: The presence of the drivers is not being tracked.
1058  * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
1059  * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
1060  * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
1061  * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
1062  * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
1063  */
1064 enum device_link_state {
1065         DL_STATE_NONE = -1,
1066         DL_STATE_DORMANT = 0,
1067         DL_STATE_AVAILABLE,
1068         DL_STATE_CONSUMER_PROBE,
1069         DL_STATE_ACTIVE,
1070         DL_STATE_SUPPLIER_UNBIND,
1071 };
1072 
1073 /*
1074  * Device link flags.
1075  *
1076  * STATELESS: The core will not remove this link automatically.
1077  * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
1078  * PM_RUNTIME: If set, the runtime PM framework will use this link.
1079  * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
1080  * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
1081  * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
1082  * MANAGED: The core tracks presence of supplier/consumer drivers (internal).
1083  */
1084 #define DL_FLAG_STATELESS               BIT(0)
1085 #define DL_FLAG_AUTOREMOVE_CONSUMER     BIT(1)
1086 #define DL_FLAG_PM_RUNTIME              BIT(2)
1087 #define DL_FLAG_RPM_ACTIVE              BIT(3)
1088 #define DL_FLAG_AUTOREMOVE_SUPPLIER     BIT(4)
1089 #define DL_FLAG_AUTOPROBE_CONSUMER      BIT(5)
1090 #define DL_FLAG_MANAGED                 BIT(6)
1091 
1092 /**
1093  * struct device_link - Device link representation.
1094  * @supplier: The device on the supplier end of the link.
1095  * @s_node: Hook to the supplier device's list of links to consumers.
1096  * @consumer: The device on the consumer end of the link.
1097  * @c_node: Hook to the consumer device's list of links to suppliers.
1098  * @status: The state of the link (with respect to the presence of drivers).
1099  * @flags: Link flags.
1100  * @rpm_active: Whether or not the consumer device is runtime-PM-active.
1101  * @kref: Count repeated addition of the same link.
1102  * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
1103  * @supplier_preactivated: Supplier has been made active before consumer probe.
1104  */
1105 struct device_link {
1106         struct device *supplier;
1107         struct list_head s_node;
1108         struct device *consumer;
1109         struct list_head c_node;
1110         enum device_link_state status;
1111         u32 flags;
1112         refcount_t rpm_active;
1113         struct kref kref;
1114 #ifdef CONFIG_SRCU
1115         struct rcu_head rcu_head;
1116 #endif
1117         bool supplier_preactivated; /* Owned by consumer probe. */
1118 };
1119 
1120 /**
1121  * enum dl_dev_state - Device driver presence tracking information.
1122  * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
1123  * @DL_DEV_PROBING: A driver is probing.
1124  * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
1125  * @DL_DEV_UNBINDING: The driver is unbinding from the device.
1126  */
1127 enum dl_dev_state {
1128         DL_DEV_NO_DRIVER = 0,
1129         DL_DEV_PROBING,
1130         DL_DEV_DRIVER_BOUND,
1131         DL_DEV_UNBINDING,
1132 };
1133 
1134 /**
1135  * struct dev_links_info - Device data related to device links.
1136  * @suppliers: List of links to supplier devices.
1137  * @consumers: List of links to consumer devices.
1138  * @status: Driver status information.
1139  */
1140 struct dev_links_info {
1141         struct list_head suppliers;
1142         struct list_head consumers;
1143         enum dl_dev_state status;
1144 };
1145 
1146 /**
1147  * struct device - The basic device structure
1148  * @parent:     The device's "parent" device, the device to which it is attached.
1149  *              In most cases, a parent device is some sort of bus or host
1150  *              controller. If parent is NULL, the device, is a top-level device,
1151  *              which is not usually what you want.
1152  * @p:          Holds the private data of the driver core portions of the device.
1153  *              See the comment of the struct device_private for detail.
1154  * @kobj:       A top-level, abstract class from which other classes are derived.
1155  * @init_name:  Initial name of the device.
1156  * @type:       The type of device.
1157  *              This identifies the device type and carries type-specific
1158  *              information.
1159  * @mutex:      Mutex to synchronize calls to its driver.
1160  * @lockdep_mutex: An optional debug lock that a subsystem can use as a
1161  *              peer lock to gain localized lockdep coverage of the device_lock.
1162  * @bus:        Type of bus device is on.
1163  * @driver:     Which driver has allocated this
1164  * @platform_data: Platform data specific to the device.
1165  *              Example: For devices on custom boards, as typical of embedded
1166  *              and SOC based hardware, Linux often uses platform_data to point
1167  *              to board-specific structures describing devices and how they
1168  *              are wired.  That can include what ports are available, chip
1169  *              variants, which GPIO pins act in what additional roles, and so
1170  *              on.  This shrinks the "Board Support Packages" (BSPs) and
1171  *              minimizes board-specific #ifdefs in drivers.
1172  * @driver_data: Private pointer for driver specific info.
1173  * @links:      Links to suppliers and consumers of this device.
1174  * @power:      For device power management.
1175  *              See Documentation/driver-api/pm/devices.rst for details.
1176  * @pm_domain:  Provide callbacks that are executed during system suspend,
1177  *              hibernation, system resume and during runtime PM transitions
1178  *              along with subsystem-level and driver-level callbacks.
1179  * @pins:       For device pin management.
1180  *              See Documentation/driver-api/pinctl.rst for details.
1181  * @msi_list:   Hosts MSI descriptors
1182  * @msi_domain: The generic MSI domain this device is using.
1183  * @numa_node:  NUMA node this device is close to.
1184  * @dma_ops:    DMA mapping operations for this device.
1185  * @dma_mask:   Dma mask (if dma'ble device).
1186  * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
1187  *              hardware supports 64-bit addresses for consistent allocations
1188  *              such descriptors.
1189  * @bus_dma_mask: Mask of an upstream bridge or bus which imposes a smaller DMA
1190  *              limit than the device itself supports.
1191  * @dma_pfn_offset: offset of DMA memory range relatively of RAM
1192  * @dma_parms:  A low level driver may set these to teach IOMMU code about
1193  *              segment limitations.
1194  * @dma_pools:  Dma pools (if dma'ble device).
1195  * @dma_mem:    Internal for coherent mem override.
1196  * @cma_area:   Contiguous memory area for dma allocations
1197  * @archdata:   For arch-specific additions.
1198  * @of_node:    Associated device tree node.
1199  * @fwnode:     Associated device node supplied by platform firmware.
1200  * @devt:       For creating the sysfs "dev".
1201  * @id:         device instance
1202  * @devres_lock: Spinlock to protect the resource of the device.
1203  * @devres_head: The resources list of the device.
1204  * @knode_class: The node used to add the device to the class list.
1205  * @class:      The class of the device.
1206  * @groups:     Optional attribute groups.
1207  * @release:    Callback to free the device after all references have
1208  *              gone away. This should be set by the allocator of the
1209  *              device (i.e. the bus driver that discovered the device).
1210  * @iommu_group: IOMMU group the device belongs to.
1211  * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
1212  * @iommu_param: Per device generic IOMMU runtime data
1213  *
1214  * @offline_disabled: If set, the device is permanently online.
1215  * @offline:    Set after successful invocation of bus type's .offline().
1216  * @of_node_reused: Set if the device-tree node is shared with an ancestor
1217  *              device.
1218  * @dma_coherent: this particular device is dma coherent, even if the
1219  *              architecture supports non-coherent devices.
1220  *
1221  * At the lowest level, every device in a Linux system is represented by an
1222  * instance of struct device. The device structure contains the information
1223  * that the device model core needs to model the system. Most subsystems,
1224  * however, track additional information about the devices they host. As a
1225  * result, it is rare for devices to be represented by bare device structures;
1226  * instead, that structure, like kobject structures, is usually embedded within
1227  * a higher-level representation of the device.
1228  */
1229 struct device {
1230         struct kobject kobj;
1231         struct device           *parent;
1232 
1233         struct device_private   *p;
1234 
1235         const char              *init_name; /* initial name of the device */
1236         const struct device_type *type;
1237 
1238         struct bus_type *bus;           /* type of bus device is on */
1239         struct device_driver *driver;   /* which driver has allocated this
1240                                            device */
1241         void            *platform_data; /* Platform specific data, device
1242                                            core doesn't touch it */
1243         void            *driver_data;   /* Driver data, set and get with
1244                                            dev_set_drvdata/dev_get_drvdata */
1245 #ifdef CONFIG_PROVE_LOCKING
1246         struct mutex            lockdep_mutex;
1247 #endif
1248         struct mutex            mutex;  /* mutex to synchronize calls to
1249                                          * its driver.
1250                                          */
1251 
1252         struct dev_links_info   links;
1253         struct dev_pm_info      power;
1254         struct dev_pm_domain    *pm_domain;
1255 
1256 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1257         struct irq_domain       *msi_domain;
1258 #endif
1259 #ifdef CONFIG_PINCTRL
1260         struct dev_pin_info     *pins;
1261 #endif
1262 #ifdef CONFIG_GENERIC_MSI_IRQ
1263         struct list_head        msi_list;
1264 #endif
1265 
1266         const struct dma_map_ops *dma_ops;
1267         u64             *dma_mask;      /* dma mask (if dma'able device) */
1268         u64             coherent_dma_mask;/* Like dma_mask, but for
1269                                              alloc_coherent mappings as
1270                                              not all hardware supports
1271                                              64 bit addresses for consistent
1272                                              allocations such descriptors. */
1273         u64             bus_dma_mask;   /* upstream dma_mask constraint */
1274         unsigned long   dma_pfn_offset;
1275 
1276         struct device_dma_parameters *dma_parms;
1277 
1278         struct list_head        dma_pools;      /* dma pools (if dma'ble) */
1279 
1280 #ifdef CONFIG_DMA_DECLARE_COHERENT
1281         struct dma_coherent_mem *dma_mem; /* internal for coherent mem
1282                                              override */
1283 #endif
1284 #ifdef CONFIG_DMA_CMA
1285         struct cma *cma_area;           /* contiguous memory area for dma
1286                                            allocations */
1287 #endif
1288         /* arch specific additions */
1289         struct dev_archdata     archdata;
1290 
1291         struct device_node      *of_node; /* associated device tree node */
1292         struct fwnode_handle    *fwnode; /* firmware device node */
1293 
1294 #ifdef CONFIG_NUMA
1295         int             numa_node;      /* NUMA node this device is close to */
1296 #endif
1297         dev_t                   devt;   /* dev_t, creates the sysfs "dev" */
1298         u32                     id;     /* device instance */
1299 
1300         spinlock_t              devres_lock;
1301         struct list_head        devres_head;
1302 
1303         struct class            *class;
1304         const struct attribute_group **groups;  /* optional groups */
1305 
1306         void    (*release)(struct device *dev);
1307         struct iommu_group      *iommu_group;
1308         struct iommu_fwspec     *iommu_fwspec;
1309         struct iommu_param      *iommu_param;
1310 
1311         bool                    offline_disabled:1;
1312         bool                    offline:1;
1313         bool                    of_node_reused:1;
1314 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
1315     defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
1316     defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
1317         bool                    dma_coherent:1;
1318 #endif
1319 };
1320 
1321 static inline struct device *kobj_to_dev(struct kobject *kobj)
1322 {
1323         return container_of(kobj, struct device, kobj);
1324 }
1325 
1326 /**
1327  * device_iommu_mapped - Returns true when the device DMA is translated
1328  *                       by an IOMMU
1329  * @dev: Device to perform the check on
1330  */
1331 static inline bool device_iommu_mapped(struct device *dev)
1332 {
1333         return (dev->iommu_group != NULL);
1334 }
1335 
1336 /* Get the wakeup routines, which depend on struct device */
1337 #include <linux/pm_wakeup.h>
1338 
1339 static inline const char *dev_name(const struct device *dev)
1340 {
1341         /* Use the init name until the kobject becomes available */
1342         if (dev->init_name)
1343                 return dev->init_name;
1344 
1345         return kobject_name(&dev->kobj);
1346 }
1347 
1348 extern __printf(2, 3)
1349 int dev_set_name(struct device *dev, const char *name, ...);
1350 
1351 #ifdef CONFIG_NUMA
1352 static inline int dev_to_node(struct device *dev)
1353 {
1354         return dev->numa_node;
1355 }
1356 static inline void set_dev_node(struct device *dev, int node)
1357 {
1358         dev->numa_node = node;
1359 }
1360 #else
1361 static inline int dev_to_node(struct device *dev)
1362 {
1363         return NUMA_NO_NODE;
1364 }
1365 static inline void set_dev_node(struct device *dev, int node)
1366 {
1367 }
1368 #endif
1369 
1370 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
1371 {
1372 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1373         return dev->msi_domain;
1374 #else
1375         return NULL;
1376 #endif
1377 }
1378 
1379 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
1380 {
1381 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1382         dev->msi_domain = d;
1383 #endif
1384 }
1385 
1386 static inline void *dev_get_drvdata(const struct device *dev)
1387 {
1388         return dev->driver_data;
1389 }
1390 
1391 static inline void dev_set_drvdata(struct device *dev, void *data)
1392 {
1393         dev->driver_data = data;
1394 }
1395 
1396 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
1397 {
1398         return dev ? dev->power.subsys_data : NULL;
1399 }
1400 
1401 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
1402 {
1403         return dev->kobj.uevent_suppress;
1404 }
1405 
1406 static inline void dev_set_uevent_suppress(struct device *dev, int val)
1407 {
1408         dev->kobj.uevent_suppress = val;
1409 }
1410 
1411 static inline int device_is_registered(struct device *dev)
1412 {
1413         return dev->kobj.state_in_sysfs;
1414 }
1415 
1416 static inline void device_enable_async_suspend(struct device *dev)
1417 {
1418         if (!dev->power.is_prepared)
1419                 dev->power.async_suspend = true;
1420 }
1421 
1422 static inline void device_disable_async_suspend(struct device *dev)
1423 {
1424         if (!dev->power.is_prepared)
1425                 dev->power.async_suspend = false;
1426 }
1427 
1428 static inline bool device_async_suspend_enabled(struct device *dev)
1429 {
1430         return !!dev->power.async_suspend;
1431 }
1432 
1433 static inline bool device_pm_not_required(struct device *dev)
1434 {
1435         return dev->power.no_pm;
1436 }
1437 
1438 static inline void device_set_pm_not_required(struct device *dev)
1439 {
1440         dev->power.no_pm = true;
1441 }
1442 
1443 static inline void dev_pm_syscore_device(struct device *dev, bool val)
1444 {
1445 #ifdef CONFIG_PM_SLEEP
1446         dev->power.syscore = val;
1447 #endif
1448 }
1449 
1450 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
1451 {
1452         dev->power.driver_flags = flags;
1453 }
1454 
1455 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
1456 {
1457         return !!(dev->power.driver_flags & flags);
1458 }
1459 
1460 static inline void device_lock(struct device *dev)
1461 {
1462         mutex_lock(&dev->mutex);
1463 }
1464 
1465 static inline int device_lock_interruptible(struct device *dev)
1466 {
1467         return mutex_lock_interruptible(&dev->mutex);
1468 }
1469 
1470 static inline int device_trylock(struct device *dev)
1471 {
1472         return mutex_trylock(&dev->mutex);
1473 }
1474 
1475 static inline void device_unlock(struct device *dev)
1476 {
1477         mutex_unlock(&dev->mutex);
1478 }
1479 
1480 static inline void device_lock_assert(struct device *dev)
1481 {
1482         lockdep_assert_held(&dev->mutex);
1483 }
1484 
1485 static inline struct device_node *dev_of_node(struct device *dev)
1486 {
1487         if (!IS_ENABLED(CONFIG_OF) || !dev)
1488                 return NULL;
1489         return dev->of_node;
1490 }
1491 
1492 void driver_init(void);
1493 
1494 /*
1495  * High level routines for use by the bus drivers
1496  */
1497 extern int __must_check device_register(struct device *dev);
1498 extern void device_unregister(struct device *dev);
1499 extern void device_initialize(struct device *dev);
1500 extern int __must_check device_add(struct device *dev);
1501 extern void device_del(struct device *dev);
1502 extern int device_for_each_child(struct device *dev, void *data,
1503                      int (*fn)(struct device *dev, void *data));
1504 extern int device_for_each_child_reverse(struct device *dev, void *data,
1505                      int (*fn)(struct device *dev, void *data));
1506 extern struct device *device_find_child(struct device *dev, void *data,
1507                                 int (*match)(struct device *dev, void *data));
1508 extern struct device *device_find_child_by_name(struct device *parent,
1509                                                 const char *name);
1510 extern int device_rename(struct device *dev, const char *new_name);
1511 extern int device_move(struct device *dev, struct device *new_parent,
1512                        enum dpm_order dpm_order);
1513 extern const char *device_get_devnode(struct device *dev,
1514                                       umode_t *mode, kuid_t *uid, kgid_t *gid,
1515                                       const char **tmp);
1516 
1517 static inline bool device_supports_offline(struct device *dev)
1518 {
1519         return dev->bus && dev->bus->offline && dev->bus->online;
1520 }
1521 
1522 extern void lock_device_hotplug(void);
1523 extern void unlock_device_hotplug(void);
1524 extern int lock_device_hotplug_sysfs(void);
1525 extern int device_offline(struct device *dev);
1526 extern int device_online(struct device *dev);
1527 extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1528 extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1529 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
1530 
1531 static inline int dev_num_vf(struct device *dev)
1532 {
1533         if (dev->bus && dev->bus->num_vf)
1534                 return dev->bus->num_vf(dev);
1535         return 0;
1536 }
1537 
1538 /*
1539  * Root device objects for grouping under /sys/devices
1540  */
1541 extern struct device *__root_device_register(const char *name,
1542                                              struct module *owner);
1543 
1544 /* This is a macro to avoid include problems with THIS_MODULE */
1545 #define root_device_register(name) \
1546         __root_device_register(name, THIS_MODULE)
1547 
1548 extern void root_device_unregister(struct device *root);
1549 
1550 static inline void *dev_get_platdata(const struct device *dev)
1551 {
1552         return dev->platform_data;
1553 }
1554 
1555 /*
1556  * Manual binding of a device to driver. See drivers/base/bus.c
1557  * for information on use.
1558  */
1559 extern int __must_check device_bind_driver(struct device *dev);
1560 extern void device_release_driver(struct device *dev);
1561 extern int  __must_check device_attach(struct device *dev);
1562 extern int __must_check driver_attach(struct device_driver *drv);
1563 extern void device_initial_probe(struct device *dev);
1564 extern int __must_check device_reprobe(struct device *dev);
1565 
1566 extern bool device_is_bound(struct device *dev);
1567 
1568 /*
1569  * Easy functions for dynamically creating devices on the fly
1570  */
1571 extern __printf(5, 0)
1572 struct device *device_create_vargs(struct class *cls, struct device *parent,
1573                                    dev_t devt, void *drvdata,
1574                                    const char *fmt, va_list vargs);
1575 extern __printf(5, 6)
1576 struct device *device_create(struct class *cls, struct device *parent,
1577                              dev_t devt, void *drvdata,
1578                              const char *fmt, ...);
1579 extern __printf(6, 7)
1580 struct device *device_create_with_groups(struct class *cls,
1581                              struct device *parent, dev_t devt, void *drvdata,
1582                              const struct attribute_group **groups,
1583                              const char *fmt, ...);
1584 extern void device_destroy(struct class *cls, dev_t devt);
1585 
1586 extern int __must_check device_add_groups(struct device *dev,
1587                                         const struct attribute_group **groups);
1588 extern void device_remove_groups(struct device *dev,
1589                                  const struct attribute_group **groups);
1590 
1591 static inline int __must_check device_add_group(struct device *dev,
1592                                         const struct attribute_group *grp)
1593 {
1594         const struct attribute_group *groups[] = { grp, NULL };
1595 
1596         return device_add_groups(dev, groups);
1597 }
1598 
1599 static inline void device_remove_group(struct device *dev,
1600                                        const struct attribute_group *grp)
1601 {
1602         const struct attribute_group *groups[] = { grp, NULL };
1603 
1604         return device_remove_groups(dev, groups);
1605 }
1606 
1607 extern int __must_check devm_device_add_groups(struct device *dev,
1608                                         const struct attribute_group **groups);
1609 extern void devm_device_remove_groups(struct device *dev,
1610                                       const struct attribute_group **groups);
1611 extern int __must_check devm_device_add_group(struct device *dev,
1612                                         const struct attribute_group *grp);
1613 extern void devm_device_remove_group(struct device *dev,
1614                                      const struct attribute_group *grp);
1615 
1616 /*
1617  * Platform "fixup" functions - allow the platform to have their say
1618  * about devices and actions that the general device layer doesn't
1619  * know about.
1620  */
1621 /* Notify platform of device discovery */
1622 extern int (*platform_notify)(struct device *dev);
1623 
1624 extern int (*platform_notify_remove)(struct device *dev);
1625 
1626 
1627 /*
1628  * get_device - atomically increment the reference count for the device.
1629  *
1630  */
1631 extern struct device *get_device(struct device *dev);
1632 extern void put_device(struct device *dev);
1633 extern bool kill_device(struct device *dev);
1634 
1635 #ifdef CONFIG_DEVTMPFS
1636 extern int devtmpfs_create_node(struct device *dev);
1637 extern int devtmpfs_delete_node(struct device *dev);
1638 extern int devtmpfs_mount(const char *mntdir);
1639 #else
1640 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1641 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1642 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1643 #endif
1644 
1645 /* drivers/base/power/shutdown.c */
1646 extern void device_shutdown(void);
1647 
1648 /* debugging and troubleshooting/diagnostic helpers. */
1649 extern const char *dev_driver_string(const struct device *dev);
1650 
1651 /* Device links interface. */
1652 struct device_link *device_link_add(struct device *consumer,
1653                                     struct device *supplier, u32 flags);
1654 void device_link_del(struct device_link *link);
1655 void device_link_remove(void *consumer, struct device *supplier);
1656 
1657 #ifndef dev_fmt
1658 #define dev_fmt(fmt) fmt
1659 #endif
1660 
1661 #ifdef CONFIG_PRINTK
1662 
1663 __printf(3, 0) __cold
1664 int dev_vprintk_emit(int level, const struct device *dev,
1665                      const char *fmt, va_list args);
1666 __printf(3, 4) __cold
1667 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1668 
1669 __printf(3, 4) __cold
1670 void dev_printk(const char *level, const struct device *dev,
1671                 const char *fmt, ...);
1672 __printf(2, 3) __cold
1673 void _dev_emerg(const struct device *dev, const char *fmt, ...);
1674 __printf(2, 3) __cold
1675 void _dev_alert(const struct device *dev, const char *fmt, ...);
1676 __printf(2, 3) __cold
1677 void _dev_crit(const struct device *dev, const char *fmt, ...);
1678 __printf(2, 3) __cold
1679 void _dev_err(const struct device *dev, const char *fmt, ...);
1680 __printf(2, 3) __cold
1681 void _dev_warn(const struct device *dev, const char *fmt, ...);
1682 __printf(2, 3) __cold
1683 void _dev_notice(const struct device *dev, const char *fmt, ...);
1684 __printf(2, 3) __cold
1685 void _dev_info(const struct device *dev, const char *fmt, ...);
1686 
1687 #else
1688 
1689 static inline __printf(3, 0)
1690 int dev_vprintk_emit(int level, const struct device *dev,
1691                      const char *fmt, va_list args)
1692 { return 0; }
1693 static inline __printf(3, 4)
1694 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1695 { return 0; }
1696 
1697 static inline void __dev_printk(const char *level, const struct device *dev,
1698                                 struct va_format *vaf)
1699 {}
1700 static inline __printf(3, 4)
1701 void dev_printk(const char *level, const struct device *dev,
1702                  const char *fmt, ...)
1703 {}
1704 
1705 static inline __printf(2, 3)
1706 void _dev_emerg(const struct device *dev, const char *fmt, ...)
1707 {}
1708 static inline __printf(2, 3)
1709 void _dev_crit(const struct device *dev, const char *fmt, ...)
1710 {}
1711 static inline __printf(2, 3)
1712 void _dev_alert(const struct device *dev, const char *fmt, ...)
1713 {}
1714 static inline __printf(2, 3)
1715 void _dev_err(const struct device *dev, const char *fmt, ...)
1716 {}
1717 static inline __printf(2, 3)
1718 void _dev_warn(const struct device *dev, const char *fmt, ...)
1719 {}
1720 static inline __printf(2, 3)
1721 void _dev_notice(const struct device *dev, const char *fmt, ...)
1722 {}
1723 static inline __printf(2, 3)
1724 void _dev_info(const struct device *dev, const char *fmt, ...)
1725 {}
1726 
1727 #endif
1728 
1729 /*
1730  * #defines for all the dev_<level> macros to prefix with whatever
1731  * possible use of #define dev_fmt(fmt) ...
1732  */
1733 
1734 #define dev_emerg(dev, fmt, ...)                                        \
1735         _dev_emerg(dev, dev_fmt(fmt), ##__VA_ARGS__)
1736 #define dev_crit(dev, fmt, ...)                                         \
1737         _dev_crit(dev, dev_fmt(fmt), ##__VA_ARGS__)
1738 #define dev_alert(dev, fmt, ...)                                        \
1739         _dev_alert(dev, dev_fmt(fmt), ##__VA_ARGS__)
1740 #define dev_err(dev, fmt, ...)                                          \
1741         _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
1742 #define dev_warn(dev, fmt, ...)                                         \
1743         _dev_warn(dev, dev_fmt(fmt), ##__VA_ARGS__)
1744 #define dev_notice(dev, fmt, ...)                                       \
1745         _dev_notice(dev, dev_fmt(fmt), ##__VA_ARGS__)
1746 #define dev_info(dev, fmt, ...)                                         \
1747         _dev_info(dev, dev_fmt(fmt), ##__VA_ARGS__)
1748 
1749 #if defined(CONFIG_DYNAMIC_DEBUG)
1750 #define dev_dbg(dev, fmt, ...)                                          \
1751         dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
1752 #elif defined(DEBUG)
1753 #define dev_dbg(dev, fmt, ...)                                          \
1754         dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
1755 #else
1756 #define dev_dbg(dev, fmt, ...)                                          \
1757 ({                                                                      \
1758         if (0)                                                          \
1759                 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1760 })
1761 #endif
1762 
1763 #ifdef CONFIG_PRINTK
1764 #define dev_level_once(dev_level, dev, fmt, ...)                        \
1765 do {                                                                    \
1766         static bool __print_once __read_mostly;                         \
1767                                                                         \
1768         if (!__print_once) {                                            \
1769                 __print_once = true;                                    \
1770                 dev_level(dev, fmt, ##__VA_ARGS__);                     \
1771         }                                                               \
1772 } while (0)
1773 #else
1774 #define dev_level_once(dev_level, dev, fmt, ...)                        \
1775 do {                                                                    \
1776         if (0)                                                          \
1777                 dev_level(dev, fmt, ##__VA_ARGS__);                     \
1778 } while (0)
1779 #endif
1780 
1781 #define dev_emerg_once(dev, fmt, ...)                                   \
1782         dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1783 #define dev_alert_once(dev, fmt, ...)                                   \
1784         dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1785 #define dev_crit_once(dev, fmt, ...)                                    \
1786         dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1787 #define dev_err_once(dev, fmt, ...)                                     \
1788         dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1789 #define dev_warn_once(dev, fmt, ...)                                    \
1790         dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1791 #define dev_notice_once(dev, fmt, ...)                                  \
1792         dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1793 #define dev_info_once(dev, fmt, ...)                                    \
1794         dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1795 #define dev_dbg_once(dev, fmt, ...)                                     \
1796         dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1797 
1798 #define dev_level_ratelimited(dev_level, dev, fmt, ...)                 \
1799 do {                                                                    \
1800         static DEFINE_RATELIMIT_STATE(_rs,                              \
1801                                       DEFAULT_RATELIMIT_INTERVAL,       \
1802                                       DEFAULT_RATELIMIT_BURST);         \
1803         if (__ratelimit(&_rs))                                          \
1804                 dev_level(dev, fmt, ##__VA_ARGS__);                     \
1805 } while (0)
1806 
1807 #define dev_emerg_ratelimited(dev, fmt, ...)                            \
1808         dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1809 #define dev_alert_ratelimited(dev, fmt, ...)                            \
1810         dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1811 #define dev_crit_ratelimited(dev, fmt, ...)                             \
1812         dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1813 #define dev_err_ratelimited(dev, fmt, ...)                              \
1814         dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1815 #define dev_warn_ratelimited(dev, fmt, ...)                             \
1816         dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1817 #define dev_notice_ratelimited(dev, fmt, ...)                           \
1818         dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1819 #define dev_info_ratelimited(dev, fmt, ...)                             \
1820         dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1821 #if defined(CONFIG_DYNAMIC_DEBUG)
1822 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1823 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1824 do {                                                                    \
1825         static DEFINE_RATELIMIT_STATE(_rs,                              \
1826                                       DEFAULT_RATELIMIT_INTERVAL,       \
1827                                       DEFAULT_RATELIMIT_BURST);         \
1828         DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);                 \
1829         if (DYNAMIC_DEBUG_BRANCH(descriptor) &&                         \
1830             __ratelimit(&_rs))                                          \
1831                 __dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt),       \
1832                                   ##__VA_ARGS__);                       \
1833 } while (0)
1834 #elif defined(DEBUG)
1835 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1836 do {                                                                    \
1837         static DEFINE_RATELIMIT_STATE(_rs,                              \
1838                                       DEFAULT_RATELIMIT_INTERVAL,       \
1839                                       DEFAULT_RATELIMIT_BURST);         \
1840         if (__ratelimit(&_rs))                                          \
1841                 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1842 } while (0)
1843 #else
1844 #define dev_dbg_ratelimited(dev, fmt, ...)                              \
1845 do {                                                                    \
1846         if (0)                                                          \
1847                 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1848 } while (0)
1849 #endif
1850 
1851 #ifdef VERBOSE_DEBUG
1852 #define dev_vdbg        dev_dbg
1853 #else
1854 #define dev_vdbg(dev, fmt, ...)                                         \
1855 ({                                                                      \
1856         if (0)                                                          \
1857                 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1858 })
1859 #endif
1860 
1861 /*
1862  * dev_WARN*() acts like dev_printk(), but with the key difference of
1863  * using WARN/WARN_ONCE to include file/line information and a backtrace.
1864  */
1865 #define dev_WARN(dev, format, arg...) \
1866         WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1867 
1868 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1869         WARN_ONCE(condition, "%s %s: " format, \
1870                         dev_driver_string(dev), dev_name(dev), ## arg)
1871 
1872 /* Create alias, so I can be autoloaded. */
1873 #define MODULE_ALIAS_CHARDEV(major,minor) \
1874         MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1875 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1876         MODULE_ALIAS("char-major-" __stringify(major) "-*")
1877 
1878 #ifdef CONFIG_SYSFS_DEPRECATED
1879 extern long sysfs_deprecated;
1880 #else
1881 #define sysfs_deprecated 0
1882 #endif
1883 
1884 /**
1885  * module_driver() - Helper macro for drivers that don't do anything
1886  * special in module init/exit. This eliminates a lot of boilerplate.
1887  * Each module may only use this macro once, and calling it replaces
1888  * module_init() and module_exit().
1889  *
1890  * @__driver: driver name
1891  * @__register: register function for this driver type
1892  * @__unregister: unregister function for this driver type
1893  * @...: Additional arguments to be passed to __register and __unregister.
1894  *
1895  * Use this macro to construct bus specific macros for registering
1896  * drivers, and do not use it on its own.
1897  */
1898 #define module_driver(__driver, __register, __unregister, ...) \
1899 static int __init __driver##_init(void) \
1900 { \
1901         return __register(&(__driver) , ##__VA_ARGS__); \
1902 } \
1903 module_init(__driver##_init); \
1904 static void __exit __driver##_exit(void) \
1905 { \
1906         __unregister(&(__driver) , ##__VA_ARGS__); \
1907 } \
1908 module_exit(__driver##_exit);
1909 
1910 /**
1911  * builtin_driver() - Helper macro for drivers that don't do anything
1912  * special in init and have no exit. This eliminates some boilerplate.
1913  * Each driver may only use this macro once, and calling it replaces
1914  * device_initcall (or in some cases, the legacy __initcall).  This is
1915  * meant to be a direct parallel of module_driver() above but without
1916  * the __exit stuff that is not used for builtin cases.
1917  *
1918  * @__driver: driver name
1919  * @__register: register function for this driver type
1920  * @...: Additional arguments to be passed to __register
1921  *
1922  * Use this macro to construct bus specific macros for registering
1923  * drivers, and do not use it on its own.
1924  */
1925 #define builtin_driver(__driver, __register, ...) \
1926 static int __init __driver##_init(void) \
1927 { \
1928         return __register(&(__driver) , ##__VA_ARGS__); \
1929 } \
1930 device_initcall(__driver##_init);
1931 
1932 #endif /* _DEVICE_H_ */