总线（bus）;设备（devices）;驱动（drivers）
2024-09-06 09:26:15
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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 nonzero value if the
74 * given device can be handled by the given driver.
75 * @uevent: Called when a device is added, removed, or a few other things
76 * that generate uevents to add the environment variables.
77 * @probe: Called when a new device or driver add to this bus, and callback
78 * the specific driver's probe to initial the matched device.
79 * @remove: Called when a device removed from this bus.
80 * @shutdown: Called at shut-down time to quiesce the device.
81 *
82 * @online: Called to put the device back online (after offlining it).
83 * @offline: Called to put the device offline for hot-removal. May fail.
84 *
85 * @suspend: Called when a device on this bus wants to go to sleep mode.
86 * @resume: Called to bring a device on this bus out of sleep mode.
87 * @pm: Power management operations of this bus, callback the specific
88 * device driver's pm-ops.
89 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
90 * driver implementations to a bus and allow the driver to do
91 * bus-specific setup
92 * @p: The private data of the driver core, only the driver core can
93 * touch this.
94 * @lock_key: Lock class key for use by the lock validator
95 *
96 * A bus is a channel between the processor and one or more devices. For the
97 * purposes of the device model, all devices are connected via a bus, even if
98 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
99 * A USB controller is usually a PCI device, for example. The device model
100 * represents the actual connections between buses and the devices they control.
101 * A bus is represented by the bus_type structure. It contains the name, the
102 * default attributes, the bus' methods, PM operations, and the driver core's
103 * private data.
104 */
105 struct bus_type {
const char *name;
const char *dev_name;
struct device *dev_root;
struct device_attribute *dev_attrs; /* use dev_groups instead */
const struct attribute_group **bus_groups;
const struct attribute_group **dev_groups;
const struct attribute_group **drv_groups; int (*match)(struct device *dev, struct device_driver *drv);
int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
int (*probe)(struct device *dev);
int (*remove)(struct device *dev);
void (*shutdown)(struct device *dev); int (*online)(struct device *dev);
int (*offline)(struct device *dev); int (*suspend)(struct device *dev, pm_message_t state);
int (*resume)(struct device *dev); const struct dev_pm_ops *pm; const struct iommu_ops *iommu_ops; struct subsys_private *p;
struct lock_class_key lock_key;
};
133
134 extern int __must_check bus_register(struct bus_type *bus);
135
136 extern void bus_unregister(struct bus_type *bus);
137
138 extern int __must_check bus_rescan_devices(struct bus_type *bus);
139
140 /* iterator helpers for buses */
141 struct subsys_dev_iter {
142 struct klist_iter ki;
143 const struct device_type *type;
144 };
145 void subsys_dev_iter_init(struct subsys_dev_iter *iter,
146 struct bus_type *subsys,
147 struct device *start,
148 const struct device_type *type);
149 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
150 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
151
152 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
153 int (*fn)(struct device *dev, void *data));
154 struct device *bus_find_device(struct bus_type *bus, struct device *start,
155 void *data,
156 int (*match)(struct device *dev, void *data));
157 struct device *bus_find_device_by_name(struct bus_type *bus,
158 struct device *start,
159 const char *name);
160 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
161 struct device *hint);
162 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
163 void *data, int (*fn)(struct device_driver *, void *));
164 void bus_sort_breadthfirst(struct bus_type *bus,
165 int (*compare)(const struct device *a,
166 const struct device *b));
167 /*
168 * Bus notifiers: Get notified of addition/removal of devices
169 * and binding/unbinding of drivers to devices.
170 * In the long run, it should be a replacement for the platform
171 * notify hooks.
172 */
173 struct notifier_block;
174
175 extern int bus_register_notifier(struct bus_type *bus,
176 struct notifier_block *nb);
177 extern int bus_unregister_notifier(struct bus_type *bus,
178 struct notifier_block *nb);
179
180 /* All 4 notifers below get called with the target struct device *
181 * as an argument. Note that those functions are likely to be called
182 * with the device lock held in the core, so be careful.
183 */
184 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
185 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
186 #define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
187 #define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
188 bound */
189 #define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
190 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
191 unbound */
192 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
193 from the device */
194
195 extern struct kset *bus_get_kset(struct bus_type *bus);
196 extern struct klist *bus_get_device_klist(struct bus_type *bus);
197
198 /**
199 * struct device_driver - The basic device driver structure
200 * @name: Name of the device driver.
201 * @bus: The bus which the device of this driver belongs to.
202 * @owner: The module owner.
203 * @mod_name: Used for built-in modules.
204 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
205 * @of_match_table: The open firmware table.
206 * @acpi_match_table: The ACPI match table.
207 * @probe: Called to query the existence of a specific device,
208 * whether this driver can work with it, and bind the driver
209 * to a specific device.
210 * @remove: Called when the device is removed from the system to
211 * unbind a device from this driver.
212 * @shutdown: Called at shut-down time to quiesce the device.
213 * @suspend: Called to put the device to sleep mode. Usually to a
214 * low power state.
215 * @resume: Called to bring a device from sleep mode.
216 * @groups: Default attributes that get created by the driver core
217 * automatically.
218 * @pm: Power management operations of the device which matched
219 * this driver.
220 * @p: Driver core's private data, no one other than the driver
221 * core can touch this.
222 *
223 * The device driver-model tracks all of the drivers known to the system.
224 * The main reason for this tracking is to enable the driver core to match
225 * up drivers with new devices. Once drivers are known objects within the
226 * system, however, a number of other things become possible. Device drivers
227 * can export information and configuration variables that are independent
228 * of any specific device.
229 */
230 struct device_driver {
const char *name;
struct bus_type *bus; struct module *owner;
const char *mod_name; /* used for built-in modules */ bool suppress_bind_attrs; /* disables bind/unbind via sysfs */ const struct of_device_id *of_match_table;
const struct acpi_device_id *acpi_match_table; int (*probe) (struct device *dev);
int (*remove) (struct device *dev);
void (*shutdown) (struct device *dev);
int (*suspend) (struct device *dev, pm_message_t state);
int (*resume) (struct device *dev);
const struct attribute_group **groups; const struct dev_pm_ops *pm; struct driver_private *p;
};
253
254
255 extern int __must_check driver_register(struct device_driver *drv);
256 extern void driver_unregister(struct device_driver *drv);
257
258 extern struct device_driver *driver_find(const char *name,
259 struct bus_type *bus);
260 extern int driver_probe_done(void);
261 extern void wait_for_device_probe(void);
262
263
264 /* sysfs interface for exporting driver attributes */
265
266 struct driver_attribute {
267 struct attribute attr;
268 ssize_t (*show)(struct device_driver *driver, char *buf);
269 ssize_t (*store)(struct device_driver *driver, const char *buf,
270 size_t count);
271 };
272
273 #define DRIVER_ATTR(_name, _mode, _show, _store) \
274 struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store)
275 #define DRIVER_ATTR_RW(_name) \
276 struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
277 #define DRIVER_ATTR_RO(_name) \
278 struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
279 #define DRIVER_ATTR_WO(_name) \
280 struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
281
282 extern int __must_check driver_create_file(struct device_driver *driver,
283 const struct driver_attribute *attr);
284 extern void driver_remove_file(struct device_driver *driver,
285 const struct driver_attribute *attr);
286
287 extern int __must_check driver_for_each_device(struct device_driver *drv,
288 struct device *start,
289 void *data,
290 int (*fn)(struct device *dev,
291 void *));
292 struct device *driver_find_device(struct device_driver *drv,
293 struct device *start, void *data,
294 int (*match)(struct device *dev, void *data));
295
296 /**
297 * struct subsys_interface - interfaces to device functions
298 * @name: name of the device function
299 * @subsys: subsytem of the devices to attach to
300 * @node: the list of functions registered at the subsystem
301 * @add_dev: device hookup to device function handler
302 * @remove_dev: device hookup to device function handler
303 *
304 * Simple interfaces attached to a subsystem. Multiple interfaces can
305 * attach to a subsystem and its devices. Unlike drivers, they do not
306 * exclusively claim or control devices. Interfaces usually represent
307 * a specific functionality of a subsystem/class of devices.
308 */
309 struct subsys_interface {
310 const char *name;
311 struct bus_type *subsys;
312 struct list_head node;
313 int (*add_dev)(struct device *dev, struct subsys_interface *sif);
314 int (*remove_dev)(struct device *dev, struct subsys_interface *sif);
315 };
316
317 int subsys_interface_register(struct subsys_interface *sif);
318 void subsys_interface_unregister(struct subsys_interface *sif);
319
320 int subsys_system_register(struct bus_type *subsys,
321 const struct attribute_group **groups);
322 int subsys_virtual_register(struct bus_type *subsys,
323 const struct attribute_group **groups);
324
325 /**
326 * struct class - device classes
327 * @name: Name of the class.
328 * @owner: The module owner.
329 * @class_attrs: Default attributes of this class.
330 * @dev_groups: Default attributes of the devices that belong to the class.
331 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
332 * @dev_uevent: Called when a device is added, removed from this class, or a
333 * few other things that generate uevents to add the environment
334 * variables.
335 * @devnode: Callback to provide the devtmpfs.
336 * @class_release: Called to release this class.
337 * @dev_release: Called to release the device.
338 * @suspend: Used to put the device to sleep mode, usually to a low power
339 * state.
340 * @resume: Used to bring the device from the sleep mode.
341 * @ns_type: Callbacks so sysfs can detemine namespaces.
342 * @namespace: Namespace of the device belongs to this class.
343 * @pm: The default device power management operations of this class.
344 * @p: The private data of the driver core, no one other than the
345 * driver core can touch this.
346 *
347 * A class is a higher-level view of a device that abstracts out low-level
348 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
349 * at the class level, they are all simply disks. Classes allow user space
350 * to work with devices based on what they do, rather than how they are
351 * connected or how they work.
352 */
353 struct class {
354 const char *name;
355 struct module *owner;
356
357 struct class_attribute *class_attrs;
358 const struct attribute_group **dev_groups;
359 struct kobject *dev_kobj;
360
361 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
362 char *(*devnode)(struct device *dev, umode_t *mode);
363
364 void (*class_release)(struct class *class);
365 void (*dev_release)(struct device *dev);
366
367 int (*suspend)(struct device *dev, pm_message_t state);
368 int (*resume)(struct device *dev);
369
370 const struct kobj_ns_type_operations *ns_type;
371 const void *(*namespace)(struct device *dev);
372
373 const struct dev_pm_ops *pm;
374
375 struct subsys_private *p;
376 };
377
378 struct class_dev_iter {
379 struct klist_iter ki;
380 const struct device_type *type;
381 };
382
383 extern struct kobject *sysfs_dev_block_kobj;
384 extern struct kobject *sysfs_dev_char_kobj;
385 extern int __must_check __class_register(struct class *class,
386 struct lock_class_key *key);
387 extern void class_unregister(struct class *class);
388
389 /* This is a #define to keep the compiler from merging different
390 * instances of the __key variable */
391 #define class_register(class) \
392 ({ \
393 static struct lock_class_key __key; \
394 __class_register(class, &__key); \
395 })
396
397 struct class_compat;
398 struct class_compat *class_compat_register(const char *name);
399 void class_compat_unregister(struct class_compat *cls);
400 int class_compat_create_link(struct class_compat *cls, struct device *dev,
401 struct device *device_link);
402 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
403 struct device *device_link);
404
405 extern void class_dev_iter_init(struct class_dev_iter *iter,
406 struct class *class,
407 struct device *start,
408 const struct device_type *type);
409 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
410 extern void class_dev_iter_exit(struct class_dev_iter *iter);
411
412 extern int class_for_each_device(struct class *class, struct device *start,
413 void *data,
414 int (*fn)(struct device *dev, void *data));
415 extern struct device *class_find_device(struct class *class,
416 struct device *start, const void *data,
417 int (*match)(struct device *, const void *));
418
419 struct class_attribute {
420 struct attribute attr;
421 ssize_t (*show)(struct class *class, struct class_attribute *attr,
422 char *buf);
423 ssize_t (*store)(struct class *class, struct class_attribute *attr,
424 const char *buf, size_t count);
425 };
426
427 #define CLASS_ATTR(_name, _mode, _show, _store) \
428 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
429 #define CLASS_ATTR_RW(_name) \
430 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
431 #define CLASS_ATTR_RO(_name) \
432 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
433
434 extern int __must_check class_create_file_ns(struct class *class,
435 const struct class_attribute *attr,
436 const void *ns);
437 extern void class_remove_file_ns(struct class *class,
438 const struct class_attribute *attr,
439 const void *ns);
440
441 static inline int __must_check class_create_file(struct class *class,
442 const struct class_attribute *attr)
443 {
444 return class_create_file_ns(class, attr, NULL);
445 }
446
447 static inline void class_remove_file(struct class *class,
448 const struct class_attribute *attr)
449 {
450 return class_remove_file_ns(class, attr, NULL);
451 }
452
453 /* Simple class attribute that is just a static string */
454 struct class_attribute_string {
455 struct class_attribute attr;
456 char *str;
457 };
458
459 /* Currently read-only only */
460 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
461 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
462 #define CLASS_ATTR_STRING(_name, _mode, _str) \
463 struct class_attribute_string class_attr_##_name = \
464 _CLASS_ATTR_STRING(_name, _mode, _str)
465
466 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
467 char *buf);
468
469 struct class_interface {
470 struct list_head node;
471 struct class *class;
472
473 int (*add_dev) (struct device *, struct class_interface *);
474 void (*remove_dev) (struct device *, struct class_interface *);
475 };
476
477 extern int __must_check class_interface_register(struct class_interface *);
478 extern void class_interface_unregister(struct class_interface *);
479
480 extern struct class * __must_check __class_create(struct module *owner,
481 const char *name,
482 struct lock_class_key *key);
483 extern void class_destroy(struct class *cls);
484
485 /* This is a #define to keep the compiler from merging different
486 * instances of the __key variable */
487 #define class_create(owner, name) \
488 ({ \
489 static struct lock_class_key __key; \
490 __class_create(owner, name, &__key); \
491 })
492
493 /*
494 * The type of device, "struct device" is embedded in. A class
495 * or bus can contain devices of different types
496 * like "partitions" and "disks", "mouse" and "event".
497 * This identifies the device type and carries type-specific
498 * information, equivalent to the kobj_type of a kobject.
499 * If "name" is specified, the uevent will contain it in
500 * the DEVTYPE variable.
501 */
502 struct device_type {
const char *name;
const struct attribute_group **groups;
int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
char *(*devnode)(struct device *dev, umode_t *mode,
kuid_t *uid, kgid_t *gid);
void (*release)(struct device *dev); const struct dev_pm_ops *pm;
};
513 /* interface for exporting device attributes */
514 struct device_attribute {
515 struct attribute attr;
516 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
517 char *buf);
518 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
519 const char *buf, size_t count);
520 };
521
522 struct dev_ext_attribute {
523 struct device_attribute attr;
524 void *var;
525 };
526
527 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
528 char *buf);
529 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
530 const char *buf, size_t count);
531 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
532 char *buf);
533 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
534 const char *buf, size_t count);
535 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
536 char *buf);
537 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
538 const char *buf, size_t count);
539
540 #define DEVICE_ATTR(_name, _mode, _show, _store) \
541 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
542 #define DEVICE_ATTR_RW(_name) \
543 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
544 #define DEVICE_ATTR_RO(_name) \
545 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
546 #define DEVICE_ATTR_WO(_name) \
547 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
548 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
549 struct dev_ext_attribute dev_attr_##_name = \
550 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
551 #define DEVICE_INT_ATTR(_name, _mode, _var) \
552 struct dev_ext_attribute dev_attr_##_name = \
553 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
554 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
555 struct dev_ext_attribute dev_attr_##_name = \
556 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
557 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
558 struct device_attribute dev_attr_##_name = \
559 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
560
561 extern int device_create_file(struct device *device,
562 const struct device_attribute *entry);
563 extern void device_remove_file(struct device *dev,
564 const struct device_attribute *attr);
565 extern bool device_remove_file_self(struct device *dev,
566 const struct device_attribute *attr);
567 extern int __must_check device_create_bin_file(struct device *dev,
568 const struct bin_attribute *attr);
569 extern void device_remove_bin_file(struct device *dev,
570 const struct bin_attribute *attr);
571
572 /* device resource management */
573 typedef void (*dr_release_t)(struct device *dev, void *res);
574 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
575
576 #ifdef CONFIG_DEBUG_DEVRES
577 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
578 const char *name);
579 #define devres_alloc(release, size, gfp) \
580 __devres_alloc(release, size, gfp, #release)
581 #else
582 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
583 #endif
584 extern void devres_for_each_res(struct device *dev, dr_release_t release,
585 dr_match_t match, void *match_data,
586 void (*fn)(struct device *, void *, void *),
587 void *data);
588 extern void devres_free(void *res);
589 extern void devres_add(struct device *dev, void *res);
590 extern void *devres_find(struct device *dev, dr_release_t release,
591 dr_match_t match, void *match_data);
592 extern void *devres_get(struct device *dev, void *new_res,
593 dr_match_t match, void *match_data);
594 extern void *devres_remove(struct device *dev, dr_release_t release,
595 dr_match_t match, void *match_data);
596 extern int devres_destroy(struct device *dev, dr_release_t release,
597 dr_match_t match, void *match_data);
598 extern int devres_release(struct device *dev, dr_release_t release,
599 dr_match_t match, void *match_data);
600
601 /* devres group */
602 extern void * __must_check devres_open_group(struct device *dev, void *id,
603 gfp_t gfp);
604 extern void devres_close_group(struct device *dev, void *id);
605 extern void devres_remove_group(struct device *dev, void *id);
606 extern int devres_release_group(struct device *dev, void *id);
607
608 /* managed devm_k.alloc/kfree for device drivers */
609 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp);
610 extern char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
611 va_list ap);
612 extern __printf(3, 4)
613 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...);
614 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
615 {
616 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
617 }
618 static inline void *devm_kmalloc_array(struct device *dev,
619 size_t n, size_t size, gfp_t flags)
620 {
621 if (size != 0 && n > SIZE_MAX / size)
622 return NULL;
623 return devm_kmalloc(dev, n * size, flags);
624 }
625 static inline void *devm_kcalloc(struct device *dev,
626 size_t n, size_t size, gfp_t flags)
627 {
628 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
629 }
630 extern void devm_kfree(struct device *dev, void *p);
631 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp);
632 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
633 gfp_t gfp);
634
635 extern unsigned long devm_get_free_pages(struct device *dev,
636 gfp_t gfp_mask, unsigned int order);
637 extern void devm_free_pages(struct device *dev, unsigned long addr);
638
639 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
640
641 /* allows to add/remove a custom action to devres stack */
642 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
643 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
644
645 struct device_dma_parameters {
646 /*
647 * a low level driver may set these to teach IOMMU code about
648 * sg limitations.
649 */
650 unsigned int max_segment_size;
651 unsigned long segment_boundary_mask;
652 };
653
654 /**
655 * struct device - The basic device structure
656 * @parent: The device's "parent" device, the device to which it is attached.
657 * In most cases, a parent device is some sort of bus or host
658 * controller. If parent is NULL, the device, is a top-level device,
659 * which is not usually what you want.
660 * @p: Holds the private data of the driver core portions of the device.
661 * See the comment of the struct device_private for detail.
662 * @kobj: A top-level, abstract class from which other classes are derived.
663 * @init_name: Initial name of the device.
664 * @type: The type of device.
665 * This identifies the device type and carries type-specific
666 * information.
667 * @mutex: Mutex to synchronize calls to its driver.
668 * @bus: Type of bus device is on.
669 * @driver: Which driver has allocated this
670 * @platform_data: Platform data specific to the device.
671 * Example: For devices on custom boards, as typical of embedded
672 * and SOC based hardware, Linux often uses platform_data to point
673 * to board-specific structures describing devices and how they
674 * are wired. That can include what ports are available, chip
675 * variants, which GPIO pins act in what additional roles, and so
676 * on. This shrinks the "Board Support Packages" (BSPs) and
677 * minimizes board-specific #ifdefs in drivers.
678 * @driver_data: Private pointer for driver specific info.
679 * @power: For device power management.
680 * See Documentation/power/devices.txt for details.
681 * @pm_domain: Provide callbacks that are executed during system suspend,
682 * hibernation, system resume and during runtime PM transitions
683 * along with subsystem-level and driver-level callbacks.
684 * @pins: For device pin management.
685 * See Documentation/pinctrl.txt for details.
686 * @numa_node: NUMA node this device is close to.
687 * @dma_mask: Dma mask (if dma'ble device).
688 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
689 * hardware supports 64-bit addresses for consistent allocations
690 * such descriptors.
691 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
692 * @dma_parms: A low level driver may set these to teach IOMMU code about
693 * segment limitations.
694 * @dma_pools: Dma pools (if dma'ble device).
695 * @dma_mem: Internal for coherent mem override.
696 * @cma_area: Contiguous memory area for dma allocations
697 * @archdata: For arch-specific additions.
698 * @of_node: Associated device tree node.
699 * @fwnode: Associated device node supplied by platform firmware.
700 * @devt: For creating the sysfs "dev".
701 * @id: device instance
702 * @devres_lock: Spinlock to protect the resource of the device.
703 * @devres_head: The resources list of the device.
704 * @knode_class: The node used to add the device to the class list.
705 * @class: The class of the device.
706 * @groups: Optional attribute groups.
707 * @release: Callback to free the device after all references have
708 * gone away. This should be set by the allocator of the
709 * device (i.e. the bus driver that discovered the device).
710 * @iommu_group: IOMMU group the device belongs to.
711 *
712 * @offline_disabled: If set, the device is permanently online.
713 * @offline: Set after successful invocation of bus type's .offline().
714 *
715 * At the lowest level, every device in a Linux system is represented by an
716 * instance of struct device. The device structure contains the information
717 * that the device model core needs to model the system. Most subsystems,
718 * however, track additional information about the devices they host. As a
719 * result, it is rare for devices to be represented by bare device structures;
720 * instead, that structure, like kobject structures, is usually embedded within
721 * a higher-level representation of the device.
722 */
struct device {
struct device *parent; struct device_private *p; struct kobject kobj;
const char *init_name; /* initial name of the device */
const struct device_type *type; struct mutex mutex; /* mutex to synchronize calls to
* its driver.
*/ struct bus_type *bus; /* type of bus device is on */
struct device_driver *driver; /* which driver has allocated this
device */
void *platform_data; /* Platform specific data, device
core doesn't touch it */
void *driver_data; /* Driver data, set and get with
dev_set/get_drvdata */
struct dev_pm_info power;
struct dev_pm_domain *pm_domain; #ifdef CONFIG_PINCTRL
struct dev_pin_info *pins;
#endif #ifdef CONFIG_NUMA
int numa_node; /* NUMA node this device is close to */
#endif
u64 *dma_mask; /* dma mask (if dma'able device) */
u64 coherent_dma_mask;/* Like dma_mask, but for
alloc_coherent mappings as
not all hardware supports
64 bit addresses for consistent
allocations such descriptors. */
unsigned long dma_pfn_offset; struct device_dma_parameters *dma_parms; struct list_head dma_pools; /* dma pools (if dma'ble) */ struct dma_coherent_mem *dma_mem; /* internal for coherent mem
override */
#ifdef CONFIG_DMA_CMA
struct cma *cma_area; /* contiguous memory area for dma
allocations */
#endif
/* arch specific additions */
struct dev_archdata archdata; struct device_node *of_node; /* associated device tree node */
struct fwnode_handle *fwnode; /* firmware device node */ dev_t devt; /* dev_t, creates the sysfs "dev" */
u32 id; /* device instance */ spinlock_t devres_lock;
struct list_head devres_head; struct klist_node knode_class;
struct class *class;
const struct attribute_group **groups; /* optional groups */ void (*release)(struct device *dev);
struct iommu_group *iommu_group; bool offline_disabled:1;
bool offline:1;
};
793
794 static inline struct device *kobj_to_dev(struct kobject *kobj)
795 {
796 return container_of(kobj, struct device, kobj);
797 }
798
799 /* Get the wakeup routines, which depend on struct device */
800 #include <linux/pm_wakeup.h>
801
802 static inline const char *dev_name(const struct device *dev)
803 {
804 /* Use the init name until the kobject becomes available */
805 if (dev->init_name)
806 return dev->init_name;
807
808 return kobject_name(&dev->kobj);
809 }
810
811 extern __printf(2, 3)
812 int dev_set_name(struct device *dev, const char *name, ...);
813
814 #ifdef CONFIG_NUMA
815 static inline int dev_to_node(struct device *dev)
816 {
817 return dev->numa_node;
818 }
819 static inline void set_dev_node(struct device *dev, int node)
820 {
821 dev->numa_node = node;
822 }
823 #else
824 static inline int dev_to_node(struct device *dev)
825 {
826 return -1;
827 }
828 static inline void set_dev_node(struct device *dev, int node)
829 {
830 }
831 #endif
832
833 static inline void *dev_get_drvdata(const struct device *dev)
834 {
835 return dev->driver_data;
836 }
837
838 static inline void dev_set_drvdata(struct device *dev, void *data)
839 {
840 dev->driver_data = data;
841 }
842
843 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
844 {
845 return dev ? dev->power.subsys_data : NULL;
846 }
847
848 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
849 {
850 return dev->kobj.uevent_suppress;
851 }
852
853 static inline void dev_set_uevent_suppress(struct device *dev, int val)
854 {
855 dev->kobj.uevent_suppress = val;
856 }
857
858 static inline int device_is_registered(struct device *dev)
859 {
860 return dev->kobj.state_in_sysfs;
861 }
862
863 static inline void device_enable_async_suspend(struct device *dev)
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