1 /* 2 * device.h - generic, centralized driver model 3 * 4 * Copyright (c) 2001-2003 Patrick Mochel <[email protected]> 5 * Copyright (c) 2004-2009 Greg Kroah-Hartman <[email protected]> 6 * Copyright (c) 2008-2009 Novell Inc. 7 * 8 * This file is released under the GPLv2 9 * 10 * See Documentation/driver-model/ for more information. 11 */ 12 13 #ifndef _DEVICE_H_ 14 #define _DEVICE_H_ 15 16 #include <linux/ioport.h> 17 #include <linux/kobject.h> 18 #include <linux/klist.h> 19 #include <linux/list.h> 20 #include <linux/lockdep.h> 21 #include <linux/compiler.h> 22 #include <linux/types.h> 23 #include <linux/mutex.h> 24 #include <linux/pinctrl/devinfo.h> 25 #include <linux/pm.h> 26 #include <linux/atomic.h> 27 #include <linux/ratelimit.h> 28 #include <linux/uidgid.h> 29 #include <linux/gfp.h> 30 #include <asm/device.h> 31 32 struct device; 33 struct device_private; 34 struct device_driver; 35 struct driver_private; 36 struct module; 37 struct class; 38 struct subsys_private; 39 struct bus_type; 40 struct device_node; 41 struct iommu_ops; 42 struct iommu_group; 43 44 struct bus_attribute { 45 struct attribute attr; 46 ssize_t (*show)(struct bus_type *bus, char *buf); 47 ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count); 48 }; 49 50 #define BUS_ATTR(_name, _mode, _show, _store) \ 51 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store) 52 #define BUS_ATTR_RW(_name) \ 53 struct bus_attribute bus_attr_##_name = __ATTR_RW(_name) 54 #define BUS_ATTR_RO(_name) \ 55 struct bus_attribute bus_attr_##_name = __ATTR_RO(_name) 56 57 extern int __must_check bus_create_file(struct bus_type *, 58 struct bus_attribute *); 59 extern void bus_remove_file(struct bus_type *, struct bus_attribute *); 60 61 /** 62 * struct bus_type - The bus type of the device 63 * 64 * @name: The name of the bus. 65 * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id). 66 * @dev_root: Default device to use as the parent. 67 * @dev_attrs: Default attributes of the devices on the bus. 68 * @bus_groups: Default attributes of the bus. 69 * @dev_groups: Default attributes of the devices on the bus. 70 * @drv_groups: Default attributes of the device drivers on the bus. 71 * @match: Called, perhaps multiple times, whenever a new device or driver 72 * is added for this bus. It should return a nonzero value if the 73 * given device can be handled by the given driver. 74 * @uevent: Called when a device is added, removed, or a few other things 75 * that generate uevents to add the environment variables. 76 * @probe: Called when a new device or driver add to this bus, and callback 77 * the specific driver's probe to initial the matched device. 78 * @remove: Called when a device removed from this bus. 79 * @shutdown: Called at shut-down time to quiesce the device. 80 * 81 * @online: Called to put the device back online (after offlining it). 82 * @offline: Called to put the device offline for hot-removal. May fail. 83 * 84 * @suspend: Called when a device on this bus wants to go to sleep mode. 85 * @resume: Called to bring a device on this bus out of sleep mode. 86 * @pm: Power management operations of this bus, callback the specific 87 * device driver's pm-ops. 88 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU 89 * driver implementations to a bus and allow the driver to do 90 * bus-specific setup 91 * @p: The private data of the driver core, only the driver core can 92 * touch this. 93 * @lock_key: Lock class key for use by the lock validator 94 * 95 * A bus is a channel between the processor and one or more devices. For the 96 * purposes of the device model, all devices are connected via a bus, even if 97 * it is an internal, virtual, "platform" bus. Buses can plug into each other. 98 * A USB controller is usually a PCI device, for example. The device model 99 * represents the actual connections between buses and the devices they control. 100 * A bus is represented by the bus_type structure. It contains the name, the 101 * default attributes, the bus' methods, PM operations, and the driver core's 102 * private data. 103 */ 104 struct bus_type { 105 const char *name; 106 const char *dev_name; 107 struct device *dev_root; 108 struct device_attribute *dev_attrs; /* use dev_groups instead */ 109 const struct attribute_group **bus_groups; 110 const struct attribute_group **dev_groups; 111 const struct attribute_group **drv_groups; 112 113 int (*match)(struct device *dev, struct device_driver *drv); 114 int (*uevent)(struct device *dev, struct kobj_uevent_env *env); 115 int (*probe)(struct device *dev); 116 int (*remove)(struct device *dev); 117 void (*shutdown)(struct device *dev); 118 119 int (*online)(struct device *dev); 120 int (*offline)(struct device *dev); 121 122 int (*suspend)(struct device *dev, pm_message_t state); 123 int (*resume)(struct device *dev); 124 125 const struct dev_pm_ops *pm; 126 127 struct iommu_ops *iommu_ops; 128 129 struct subsys_private *p; 130 struct lock_class_key lock_key; 131 }; 132 133 extern int __must_check bus_register(struct bus_type *bus); 134 135 extern void bus_unregister(struct bus_type *bus); 136 137 extern int __must_check bus_rescan_devices(struct bus_type *bus); 138 139 /* iterator helpers for buses */ 140 struct subsys_dev_iter { 141 struct klist_iter ki; 142 const struct device_type *type; 143 }; 144 void subsys_dev_iter_init(struct subsys_dev_iter *iter, 145 struct bus_type *subsys, 146 struct device *start, 147 const struct device_type *type); 148 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter); 149 void subsys_dev_iter_exit(struct subsys_dev_iter *iter); 150 151 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data, 152 int (*fn)(struct device *dev, void *data)); 153 struct device *bus_find_device(struct bus_type *bus, struct device *start, 154 void *data, 155 int (*match)(struct device *dev, void *data)); 156 struct device *bus_find_device_by_name(struct bus_type *bus, 157 struct device *start, 158 const char *name); 159 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id, 160 struct device *hint); 161 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start, 162 void *data, int (*fn)(struct device_driver *, void *)); 163 void bus_sort_breadthfirst(struct bus_type *bus, 164 int (*compare)(const struct device *a, 165 const struct device *b)); 166 /* 167 * Bus notifiers: Get notified of addition/removal of devices 168 * and binding/unbinding of drivers to devices. 169 * In the long run, it should be a replacement for the platform 170 * notify hooks. 171 */ 172 struct notifier_block; 173 174 extern int bus_register_notifier(struct bus_type *bus, 175 struct notifier_block *nb); 176 extern int bus_unregister_notifier(struct bus_type *bus, 177 struct notifier_block *nb); 178 179 /* All 4 notifers below get called with the target struct device * 180 * as an argument. Note that those functions are likely to be called 181 * with the device lock held in the core, so be careful. 182 */ 183 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */ 184 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */ 185 #define BUS_NOTIFY_BIND_DRIVER 0x00000003 /* driver about to be 186 bound */ 187 #define BUS_NOTIFY_BOUND_DRIVER 0x00000004 /* driver bound to device */ 188 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000005 /* driver about to be 189 unbound */ 190 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000006 /* driver is unbound 191 from the device */ 192 193 extern struct kset *bus_get_kset(struct bus_type *bus); 194 extern struct klist *bus_get_device_klist(struct bus_type *bus); 195 196 /** 197 * struct device_driver - The basic device driver structure 198 * @name: Name of the device driver. 199 * @bus: The bus which the device of this driver belongs to. 200 * @owner: The module owner. 201 * @mod_name: Used for built-in modules. 202 * @suppress_bind_attrs: Disables bind/unbind via sysfs. 203 * @of_match_table: The open firmware table. 204 * @acpi_match_table: The ACPI match table. 205 * @probe: Called to query the existence of a specific device, 206 * whether this driver can work with it, and bind the driver 207 * to a specific device. 208 * @remove: Called when the device is removed from the system to 209 * unbind a device from this driver. 210 * @shutdown: Called at shut-down time to quiesce the device. 211 * @suspend: Called to put the device to sleep mode. Usually to a 212 * low power state. 213 * @resume: Called to bring a device from sleep mode. 214 * @groups: Default attributes that get created by the driver core 215 * automatically. 216 * @pm: Power management operations of the device which matched 217 * this driver. 218 * @p: Driver core's private data, no one other than the driver 219 * core can touch this. 220 * 221 * The device driver-model tracks all of the drivers known to the system. 222 * The main reason for this tracking is to enable the driver core to match 223 * up drivers with new devices. Once drivers are known objects within the 224 * system, however, a number of other things become possible. Device drivers 225 * can export information and configuration variables that are independent 226 * of any specific device. 227 */ 228 struct device_driver { 229 const char *name; 230 struct bus_type *bus; 231 232 struct module *owner; 233 const char *mod_name; /* used for built-in modules */ 234 235 bool suppress_bind_attrs; /* disables bind/unbind via sysfs */ 236 237 const struct of_device_id *of_match_table; 238 const struct acpi_device_id *acpi_match_table; 239 240 int (*probe) (struct device *dev); 241 int (*remove) (struct device *dev); 242 void (*shutdown) (struct device *dev); 243 int (*suspend) (struct device *dev, pm_message_t state); 244 int (*resume) (struct device *dev); 245 const struct attribute_group **groups; 246 247 const struct dev_pm_ops *pm; 248 249 struct driver_private *p; 250 }; 251 252 253 extern int __must_check driver_register(struct device_driver *drv); 254 extern void driver_unregister(struct device_driver *drv); 255 256 extern struct device_driver *driver_find(const char *name, 257 struct bus_type *bus); 258 extern int driver_probe_done(void); 259 extern void wait_for_device_probe(void); 260 261 262 /* sysfs interface for exporting driver attributes */ 263 264 struct driver_attribute { 265 struct attribute attr; 266 ssize_t (*show)(struct device_driver *driver, char *buf); 267 ssize_t (*store)(struct device_driver *driver, const char *buf, 268 size_t count); 269 }; 270 271 #define DRIVER_ATTR(_name, _mode, _show, _store) \ 272 struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store) 273 #define DRIVER_ATTR_RW(_name) \ 274 struct driver_attribute driver_attr_##_name = __ATTR_RW(_name) 275 #define DRIVER_ATTR_RO(_name) \ 276 struct driver_attribute driver_attr_##_name = __ATTR_RO(_name) 277 #define DRIVER_ATTR_WO(_name) \ 278 struct driver_attribute driver_attr_##_name = __ATTR_WO(_name) 279 280 extern int __must_check driver_create_file(struct device_driver *driver, 281 const struct driver_attribute *attr); 282 extern void driver_remove_file(struct device_driver *driver, 283 const struct driver_attribute *attr); 284 285 extern int __must_check driver_for_each_device(struct device_driver *drv, 286 struct device *start, 287 void *data, 288 int (*fn)(struct device *dev, 289 void *)); 290 struct device *driver_find_device(struct device_driver *drv, 291 struct device *start, void *data, 292 int (*match)(struct device *dev, void *data)); 293 294 /** 295 * struct subsys_interface - interfaces to device functions 296 * @name: name of the device function 297 * @subsys: subsytem of the devices to attach to 298 * @node: the list of functions registered at the subsystem 299 * @add_dev: device hookup to device function handler 300 * @remove_dev: device hookup to device function handler 301 * 302 * Simple interfaces attached to a subsystem. Multiple interfaces can 303 * attach to a subsystem and its devices. Unlike drivers, they do not 304 * exclusively claim or control devices. Interfaces usually represent 305 * a specific functionality of a subsystem/class of devices. 306 */ 307 struct subsys_interface { 308 const char *name; 309 struct bus_type *subsys; 310 struct list_head node; 311 int (*add_dev)(struct device *dev, struct subsys_interface *sif); 312 int (*remove_dev)(struct device *dev, struct subsys_interface *sif); 313 }; 314 315 int subsys_interface_register(struct subsys_interface *sif); 316 void subsys_interface_unregister(struct subsys_interface *sif); 317 318 int subsys_system_register(struct bus_type *subsys, 319 const struct attribute_group **groups); 320 int subsys_virtual_register(struct bus_type *subsys, 321 const struct attribute_group **groups); 322 323 /** 324 * struct class - device classes 325 * @name: Name of the class. 326 * @owner: The module owner. 327 * @class_attrs: Default attributes of this class. 328 * @dev_groups: Default attributes of the devices that belong to the class. 329 * @dev_kobj: The kobject that represents this class and links it into the hierarchy. 330 * @dev_uevent: Called when a device is added, removed from this class, or a 331 * few other things that generate uevents to add the environment 332 * variables. 333 * @devnode: Callback to provide the devtmpfs. 334 * @class_release: Called to release this class. 335 * @dev_release: Called to release the device. 336 * @suspend: Used to put the device to sleep mode, usually to a low power 337 * state. 338 * @resume: Used to bring the device from the sleep mode. 339 * @ns_type: Callbacks so sysfs can detemine namespaces. 340 * @namespace: Namespace of the device belongs to this class. 341 * @pm: The default device power management operations of this class. 342 * @p: The private data of the driver core, no one other than the 343 * driver core can touch this. 344 * 345 * A class is a higher-level view of a device that abstracts out low-level 346 * implementation details. Drivers may see a SCSI disk or an ATA disk, but, 347 * at the class level, they are all simply disks. Classes allow user space 348 * to work with devices based on what they do, rather than how they are 349 * connected or how they work. 350 */ 351 struct class { 352 const char *name; 353 struct module *owner; 354 355 struct class_attribute *class_attrs; 356 const struct attribute_group **dev_groups; 357 struct kobject *dev_kobj; 358 359 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env); 360 char *(*devnode)(struct device *dev, umode_t *mode); 361 362 void (*class_release)(struct class *class); 363 void (*dev_release)(struct device *dev); 364 365 int (*suspend)(struct device *dev, pm_message_t state); 366 int (*resume)(struct device *dev); 367 368 const struct kobj_ns_type_operations *ns_type; 369 const void *(*namespace)(struct device *dev); 370 371 const struct dev_pm_ops *pm; 372 373 struct subsys_private *p; 374 }; 375 376 struct class_dev_iter { 377 struct klist_iter ki; 378 const struct device_type *type; 379 }; 380 381 extern struct kobject *sysfs_dev_block_kobj; 382 extern struct kobject *sysfs_dev_char_kobj; 383 extern int __must_check __class_register(struct class *class, 384 struct lock_class_key *key); 385 extern void class_unregister(struct class *class); 386 387 /* This is a #define to keep the compiler from merging different 388 * instances of the __key variable */ 389 #define class_register(class) \ 390 ({ \ 391 static struct lock_class_key __key; \ 392 __class_register(class, &__key); \ 393 }) 394 395 struct class_compat; 396 struct class_compat *class_compat_register(const char *name); 397 void class_compat_unregister(struct class_compat *cls); 398 int class_compat_create_link(struct class_compat *cls, struct device *dev, 399 struct device *device_link); 400 void class_compat_remove_link(struct class_compat *cls, struct device *dev, 401 struct device *device_link); 402 403 extern void class_dev_iter_init(struct class_dev_iter *iter, 404 struct class *class, 405 struct device *start, 406 const struct device_type *type); 407 extern struct device *class_dev_iter_next(struct class_dev_iter *iter); 408 extern void class_dev_iter_exit(struct class_dev_iter *iter); 409 410 extern int class_for_each_device(struct class *class, struct device *start, 411 void *data, 412 int (*fn)(struct device *dev, void *data)); 413 extern struct device *class_find_device(struct class *class, 414 struct device *start, const void *data, 415 int (*match)(struct device *, const void *)); 416 417 struct class_attribute { 418 struct attribute attr; 419 ssize_t (*show)(struct class *class, struct class_attribute *attr, 420 char *buf); 421 ssize_t (*store)(struct class *class, struct class_attribute *attr, 422 const char *buf, size_t count); 423 }; 424 425 #define CLASS_ATTR(_name, _mode, _show, _store) \ 426 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store) 427 #define CLASS_ATTR_RW(_name) \ 428 struct class_attribute class_attr_##_name = __ATTR_RW(_name) 429 #define CLASS_ATTR_RO(_name) \ 430 struct class_attribute class_attr_##_name = __ATTR_RO(_name) 431 432 extern int __must_check class_create_file_ns(struct class *class, 433 const struct class_attribute *attr, 434 const void *ns); 435 extern void class_remove_file_ns(struct class *class, 436 const struct class_attribute *attr, 437 const void *ns); 438 439 static inline int __must_check class_create_file(struct class *class, 440 const struct class_attribute *attr) 441 { 442 return class_create_file_ns(class, attr, NULL); 443 } 444 445 static inline void class_remove_file(struct class *class, 446 const struct class_attribute *attr) 447 { 448 return class_remove_file_ns(class, attr, NULL); 449 } 450 451 /* Simple class attribute that is just a static string */ 452 struct class_attribute_string { 453 struct class_attribute attr; 454 char *str; 455 }; 456 457 /* Currently read-only only */ 458 #define _CLASS_ATTR_STRING(_name, _mode, _str) \ 459 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str } 460 #define CLASS_ATTR_STRING(_name, _mode, _str) \ 461 struct class_attribute_string class_attr_##_name = \ 462 _CLASS_ATTR_STRING(_name, _mode, _str) 463 464 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr, 465 char *buf); 466 467 struct class_interface { 468 struct list_head node; 469 struct class *class; 470 471 int (*add_dev) (struct device *, struct class_interface *); 472 void (*remove_dev) (struct device *, struct class_interface *); 473 }; 474 475 extern int __must_check class_interface_register(struct class_interface *); 476 extern void class_interface_unregister(struct class_interface *); 477 478 extern struct class * __must_check __class_create(struct module *owner, 479 const char *name, 480 struct lock_class_key *key); 481 extern void class_destroy(struct class *cls); 482 483 /* This is a #define to keep the compiler from merging different 484 * instances of the __key variable */ 485 #define class_create(owner, name) \ 486 ({ \ 487 static struct lock_class_key __key; \ 488 __class_create(owner, name, &__key); \ 489 }) 490 491 /* 492 * The type of device, "struct device" is embedded in. A class 493 * or bus can contain devices of different types 494 * like "partitions" and "disks", "mouse" and "event". 495 * This identifies the device type and carries type-specific 496 * information, equivalent to the kobj_type of a kobject. 497 * If "name" is specified, the uevent will contain it in 498 * the DEVTYPE variable. 499 */ 500 struct device_type { 501 const char *name; 502 const struct attribute_group **groups; 503 int (*uevent)(struct device *dev, struct kobj_uevent_env *env); 504 char *(*devnode)(struct device *dev, umode_t *mode, 505 kuid_t *uid, kgid_t *gid); 506 void (*release)(struct device *dev); 507 508 const struct dev_pm_ops *pm; 509 }; 510 511 /* interface for exporting device attributes */ 512 struct device_attribute { 513 struct attribute attr; 514 ssize_t (*show)(struct device *dev, struct device_attribute *attr, 515 char *buf); 516 ssize_t (*store)(struct device *dev, struct device_attribute *attr, 517 const char *buf, size_t count); 518 }; 519 520 struct dev_ext_attribute { 521 struct device_attribute attr; 522 void *var; 523 }; 524 525 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr, 526 char *buf); 527 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr, 528 const char *buf, size_t count); 529 ssize_t device_show_int(struct device *dev, struct device_attribute *attr, 530 char *buf); 531 ssize_t device_store_int(struct device *dev, struct device_attribute *attr, 532 const char *buf, size_t count); 533 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, 534 char *buf); 535 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, 536 const char *buf, size_t count); 537 538 #define DEVICE_ATTR(_name, _mode, _show, _store) \ 539 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store) 540 #define DEVICE_ATTR_RW(_name) \ 541 struct device_attribute dev_attr_##_name = __ATTR_RW(_name) 542 #define DEVICE_ATTR_RO(_name) \ 543 struct device_attribute dev_attr_##_name = __ATTR_RO(_name) 544 #define DEVICE_ATTR_WO(_name) \ 545 struct device_attribute dev_attr_##_name = __ATTR_WO(_name) 546 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \ 547 struct dev_ext_attribute dev_attr_##_name = \ 548 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) } 549 #define DEVICE_INT_ATTR(_name, _mode, _var) \ 550 struct dev_ext_attribute dev_attr_##_name = \ 551 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) } 552 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \ 553 struct dev_ext_attribute dev_attr_##_name = \ 554 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) } 555 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \ 556 struct device_attribute dev_attr_##_name = \ 557 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) 558 559 extern int device_create_file(struct device *device, 560 const struct device_attribute *entry); 561 extern void device_remove_file(struct device *dev, 562 const struct device_attribute *attr); 563 extern bool device_remove_file_self(struct device *dev, 564 const struct device_attribute *attr); 565 extern int __must_check device_create_bin_file(struct device *dev, 566 const struct bin_attribute *attr); 567 extern void device_remove_bin_file(struct device *dev, 568 const struct bin_attribute *attr); 569 extern int device_schedule_callback_owner(struct device *dev, 570 void (*func)(struct device *dev), struct module *owner); 571 572 /* This is a macro to avoid include problems with THIS_MODULE */ 573 #define device_schedule_callback(dev, func) \ 574 device_schedule_callback_owner(dev, func, THIS_MODULE) 575 576 /* device resource management */ 577 typedef void (*dr_release_t)(struct device *dev, void *res); 578 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data); 579 580 #ifdef CONFIG_DEBUG_DEVRES 581 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp, 582 const char *name); 583 #define devres_alloc(release, size, gfp) \ 584 __devres_alloc(release, size, gfp, #release) 585 #else 586 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp); 587 #endif 588 extern void devres_for_each_res(struct device *dev, dr_release_t release, 589 dr_match_t match, void *match_data, 590 void (*fn)(struct device *, void *, void *), 591 void *data); 592 extern void devres_free(void *res); 593 extern void devres_add(struct device *dev, void *res); 594 extern void *devres_find(struct device *dev, dr_release_t release, 595 dr_match_t match, void *match_data); 596 extern void *devres_get(struct device *dev, void *new_res, 597 dr_match_t match, void *match_data); 598 extern void *devres_remove(struct device *dev, dr_release_t release, 599 dr_match_t match, void *match_data); 600 extern int devres_destroy(struct device *dev, dr_release_t release, 601 dr_match_t match, void *match_data); 602 extern int devres_release(struct device *dev, dr_release_t release, 603 dr_match_t match, void *match_data); 604 605 /* devres group */ 606 extern void * __must_check devres_open_group(struct device *dev, void *id, 607 gfp_t gfp); 608 extern void devres_close_group(struct device *dev, void *id); 609 extern void devres_remove_group(struct device *dev, void *id); 610 extern int devres_release_group(struct device *dev, void *id); 611 612 /* managed devm_k.alloc/kfree for device drivers */ 613 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp); 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); 632 633 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res); 634 void __iomem *devm_request_and_ioremap(struct device *dev, 635 struct resource *res); 636 637 /* allows to add/remove a custom action to devres stack */ 638 int devm_add_action(struct device *dev, void (*action)(void *), void *data); 639 void devm_remove_action(struct device *dev, void (*action)(void *), void *data); 640 641 struct device_dma_parameters { 642 /* 643 * a low level driver may set these to teach IOMMU code about 644 * sg limitations. 645 */ 646 unsigned int max_segment_size; 647 unsigned long segment_boundary_mask; 648 }; 649 650 struct acpi_device; 651 652 struct acpi_dev_node { 653 #ifdef CONFIG_ACPI 654 struct acpi_device *companion; 655 #endif 656 }; 657 658 /** 659 * struct device - The basic device structure 660 * @parent: The device's "parent" device, the device to which it is attached. 661 * In most cases, a parent device is some sort of bus or host 662 * controller. If parent is NULL, the device, is a top-level device, 663 * which is not usually what you want. 664 * @p: Holds the private data of the driver core portions of the device. 665 * See the comment of the struct device_private for detail. 666 * @kobj: A top-level, abstract class from which other classes are derived. 667 * @init_name: Initial name of the device. 668 * @type: The type of device. 669 * This identifies the device type and carries type-specific 670 * information. 671 * @mutex: Mutex to synchronize calls to its driver. 672 * @bus: Type of bus device is on. 673 * @driver: Which driver has allocated this 674 * @platform_data: Platform data specific to the device. 675 * Example: For devices on custom boards, as typical of embedded 676 * and SOC based hardware, Linux often uses platform_data to point 677 * to board-specific structures describing devices and how they 678 * are wired. That can include what ports are available, chip 679 * variants, which GPIO pins act in what additional roles, and so 680 * on. This shrinks the "Board Support Packages" (BSPs) and 681 * minimizes board-specific #ifdefs in drivers. 682 * @power: For device power management. 683 * See Documentation/power/devices.txt for details. 684 * @pm_domain: Provide callbacks that are executed during system suspend, 685 * hibernation, system resume and during runtime PM transitions 686 * along with subsystem-level and driver-level callbacks. 687 * @pins: For device pin management. 688 * See Documentation/pinctrl.txt for details. 689 * @numa_node: NUMA node this device is close to. 690 * @dma_mask: Dma mask (if dma'ble device). 691 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all 692 * hardware supports 64-bit addresses for consistent allocations 693 * such descriptors. 694 * @dma_parms: A low level driver may set these to teach IOMMU code about 695 * segment limitations. 696 * @dma_pools: Dma pools (if dma'ble device). 697 * @dma_mem: Internal for coherent mem override. 698 * @cma_area: Contiguous memory area for dma allocations 699 * @archdata: For arch-specific additions. 700 * @of_node: Associated device tree node. 701 * @acpi_node: Associated ACPI device node. 702 * @devt: For creating the sysfs "dev". 703 * @id: device instance 704 * @devres_lock: Spinlock to protect the resource of the device. 705 * @devres_head: The resources list of the device. 706 * @knode_class: The node used to add the device to the class list. 707 * @class: The class of the device. 708 * @groups: Optional attribute groups. 709 * @release: Callback to free the device after all references have 710 * gone away. This should be set by the allocator of the 711 * device (i.e. the bus driver that discovered the device). 712 * @iommu_group: IOMMU group the device belongs to. 713 * 714 * @offline_disabled: If set, the device is permanently online. 715 * @offline: Set after successful invocation of bus type's .offline(). 716 * 717 * At the lowest level, every device in a Linux system is represented by an 718 * instance of struct device. The device structure contains the information 719 * that the device model core needs to model the system. Most subsystems, 720 * however, track additional information about the devices they host. As a 721 * result, it is rare for devices to be represented by bare device structures; 722 * instead, that structure, like kobject structures, is usually embedded within 723 * a higher-level representation of the device. 724 */ 725 struct device { 726 struct device *parent; 727 728 struct device_private *p; 729 730 struct kobject kobj; 731 const char *init_name; /* initial name of the device */ 732 const struct device_type *type; 733 734 struct mutex mutex; /* mutex to synchronize calls to 735 * its driver. 736 */ 737 738 struct bus_type *bus; /* type of bus device is on */ 739 struct device_driver *driver; /* which driver has allocated this 740 device */ 741 void *platform_data; /* Platform specific data, device 742 core doesn't touch it */ 743 struct dev_pm_info power; 744 struct dev_pm_domain *pm_domain; 745 746 #ifdef CONFIG_PINCTRL 747 struct dev_pin_info *pins; 748 #endif 749 750 #ifdef CONFIG_NUMA 751 int numa_node; /* NUMA node this device is close to */ 752 #endif 753 u64 *dma_mask; /* dma mask (if dma'able device) */ 754 u64 coherent_dma_mask;/* Like dma_mask, but for 755 alloc_coherent mappings as 756 not all hardware supports 757 64 bit addresses for consistent 758 allocations such descriptors. */ 759 760 struct device_dma_parameters *dma_parms; 761 762 struct list_head dma_pools; /* dma pools (if dma'ble) */ 763 764 struct dma_coherent_mem *dma_mem; /* internal for coherent mem 765 override */ 766 #ifdef CONFIG_DMA_CMA 767 struct cma *cma_area; /* contiguous memory area for dma 768 allocations */ 769 #endif 770 /* arch specific additions */ 771 struct dev_archdata archdata; 772 773 struct device_node *of_node; /* associated device tree node */ 774 struct acpi_dev_node acpi_node; /* associated ACPI device node */ 775 776 dev_t devt; /* dev_t, creates the sysfs "dev" */ 777 u32 id; /* device instance */ 778 779 spinlock_t devres_lock; 780 struct list_head devres_head; 781 782 struct klist_node knode_class; 783 struct class *class; 784 const struct attribute_group **groups; /* optional groups */ 785 786 void (*release)(struct device *dev); 787 struct iommu_group *iommu_group; 788 789 bool offline_disabled:1; 790 bool offline:1; 791 }; 792 793 static inline struct device *kobj_to_dev(struct kobject *kobj) 794 { 795 return container_of(kobj, struct device, kobj); 796 } 797 798 /* Get the wakeup routines, which depend on struct device */ 799 #include <linux/pm_wakeup.h> 800 801 static inline const char *dev_name(const struct device *dev) 802 { 803 /* Use the init name until the kobject becomes available */ 804 if (dev->init_name) 805 return dev->init_name; 806 807 return kobject_name(&dev->kobj); 808 } 809 810 extern __printf(2, 3) 811 int dev_set_name(struct device *dev, const char *name, ...); 812 813 #ifdef CONFIG_NUMA 814 static inline int dev_to_node(struct device *dev) 815 { 816 return dev->numa_node; 817 } 818 static inline void set_dev_node(struct device *dev, int node) 819 { 820 dev->numa_node = node; 821 } 822 #else 823 static inline int dev_to_node(struct device *dev) 824 { 825 return -1; 826 } 827 static inline void set_dev_node(struct device *dev, int node) 828 { 829 } 830 #endif 831 832 static inline struct pm_subsys_data *dev_to_psd(struct device *dev) 833 { 834 return dev ? dev->power.subsys_data : NULL; 835 } 836 837 static inline unsigned int dev_get_uevent_suppress(const struct device *dev) 838 { 839 return dev->kobj.uevent_suppress; 840 } 841 842 static inline void dev_set_uevent_suppress(struct device *dev, int val) 843 { 844 dev->kobj.uevent_suppress = val; 845 } 846 847 static inline int device_is_registered(struct device *dev) 848 { 849 return dev->kobj.state_in_sysfs; 850 } 851 852 static inline void device_enable_async_suspend(struct device *dev) 853 { 854 if (!dev->power.is_prepared) 855 dev->power.async_suspend = true; 856 } 857 858 static inline void device_disable_async_suspend(struct device *dev) 859 { 860 if (!dev->power.is_prepared) 861 dev->power.async_suspend = false; 862 } 863 864 static inline bool device_async_suspend_enabled(struct device *dev) 865 { 866 return !!dev->power.async_suspend; 867 } 868 869 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) 870 { 871 dev->power.ignore_children = enable; 872 } 873 874 static inline void dev_pm_syscore_device(struct device *dev, bool val) 875 { 876 #ifdef CONFIG_PM_SLEEP 877 dev->power.syscore = val; 878 #endif 879 } 880 881 static inline void device_lock(struct device *dev) 882 { 883 mutex_lock(&dev->mutex); 884 } 885 886 static inline int device_trylock(struct device *dev) 887 { 888 return mutex_trylock(&dev->mutex); 889 } 890 891 static inline void device_unlock(struct device *dev) 892 { 893 mutex_unlock(&dev->mutex); 894 } 895 896 void driver_init(void); 897 898 /* 899 * High level routines for use by the bus drivers 900 */ 901 extern int __must_check device_register(struct device *dev); 902 extern void device_unregister(struct device *dev); 903 extern void device_initialize(struct device *dev); 904 extern int __must_check device_add(struct device *dev); 905 extern void device_del(struct device *dev); 906 extern int device_for_each_child(struct device *dev, void *data, 907 int (*fn)(struct device *dev, void *data)); 908 extern struct device *device_find_child(struct device *dev, void *data, 909 int (*match)(struct device *dev, void *data)); 910 extern int device_rename(struct device *dev, const char *new_name); 911 extern int device_move(struct device *dev, struct device *new_parent, 912 enum dpm_order dpm_order); 913 extern const char *device_get_devnode(struct device *dev, 914 umode_t *mode, kuid_t *uid, kgid_t *gid, 915 const char **tmp); 916 extern void *dev_get_drvdata(const struct device *dev); 917 extern int dev_set_drvdata(struct device *dev, void *data); 918 919 static inline bool device_supports_offline(struct device *dev) 920 { 921 return dev->bus && dev->bus->offline && dev->bus->online; 922 } 923 924 extern void lock_device_hotplug(void); 925 extern void unlock_device_hotplug(void); 926 extern int lock_device_hotplug_sysfs(void); 927 extern int device_offline(struct device *dev); 928 extern int device_online(struct device *dev); 929 /* 930 * Root device objects for grouping under /sys/devices 931 */ 932 extern struct device *__root_device_register(const char *name, 933 struct module *owner); 934 935 /* 936 * This is a macro to avoid include problems with THIS_MODULE, 937 * just as per what is done for device_schedule_callback() above. 938 */ 939 #define root_device_register(name) \ 940 __root_device_register(name, THIS_MODULE) 941 942 extern void root_device_unregister(struct device *root); 943 944 static inline void *dev_get_platdata(const struct device *dev) 945 { 946 return dev->platform_data; 947 } 948 949 /* 950 * Manual binding of a device to driver. See drivers/base/bus.c 951 * for information on use. 952 */ 953 extern int __must_check device_bind_driver(struct device *dev); 954 extern void device_release_driver(struct device *dev); 955 extern int __must_check device_attach(struct device *dev); 956 extern int __must_check driver_attach(struct device_driver *drv); 957 extern int __must_check device_reprobe(struct device *dev); 958 959 /* 960 * Easy functions for dynamically creating devices on the fly 961 */ 962 extern struct device *device_create_vargs(struct class *cls, 963 struct device *parent, 964 dev_t devt, 965 void *drvdata, 966 const char *fmt, 967 va_list vargs); 968 extern __printf(5, 6) 969 struct device *device_create(struct class *cls, struct device *parent, 970 dev_t devt, void *drvdata, 971 const char *fmt, ...); 972 extern __printf(6, 7) 973 struct device *device_create_with_groups(struct class *cls, 974 struct device *parent, dev_t devt, void *drvdata, 975 const struct attribute_group **groups, 976 const char *fmt, ...); 977 extern void device_destroy(struct class *cls, dev_t devt); 978 979 /* 980 * Platform "fixup" functions - allow the platform to have their say 981 * about devices and actions that the general device layer doesn't 982 * know about. 983 */ 984 /* Notify platform of device discovery */ 985 extern int (*platform_notify)(struct device *dev); 986 987 extern int (*platform_notify_remove)(struct device *dev); 988 989 990 /* 991 * get_device - atomically increment the reference count for the device. 992 * 993 */ 994 extern struct device *get_device(struct device *dev); 995 extern void put_device(struct device *dev); 996 997 #ifdef CONFIG_DEVTMPFS 998 extern int devtmpfs_create_node(struct device *dev); 999 extern int devtmpfs_delete_node(struct device *dev); 1000 extern int devtmpfs_mount(const char *mntdir); 1001 #else 1002 static inline int devtmpfs_create_node(struct device *dev) { return 0; } 1003 static inline int devtmpfs_delete_node(struct device *dev) { return 0; } 1004 static inline int devtmpfs_mount(const char *mountpoint) { return 0; } 1005 #endif 1006 1007 /* drivers/base/power/shutdown.c */ 1008 extern void device_shutdown(void); 1009 1010 /* debugging and troubleshooting/diagnostic helpers. */ 1011 extern const char *dev_driver_string(const struct device *dev); 1012 1013 1014 #ifdef CONFIG_PRINTK 1015 1016 extern __printf(3, 0) 1017 int dev_vprintk_emit(int level, const struct device *dev, 1018 const char *fmt, va_list args); 1019 extern __printf(3, 4) 1020 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...); 1021 1022 extern __printf(3, 4) 1023 int dev_printk(const char *level, const struct device *dev, 1024 const char *fmt, ...); 1025 extern __printf(2, 3) 1026 int dev_emerg(const struct device *dev, const char *fmt, ...); 1027 extern __printf(2, 3) 1028 int dev_alert(const struct device *dev, const char *fmt, ...); 1029 extern __printf(2, 3) 1030 int dev_crit(const struct device *dev, const char *fmt, ...); 1031 extern __printf(2, 3) 1032 int dev_err(const struct device *dev, const char *fmt, ...); 1033 extern __printf(2, 3) 1034 int dev_warn(const struct device *dev, const char *fmt, ...); 1035 extern __printf(2, 3) 1036 int dev_notice(const struct device *dev, const char *fmt, ...); 1037 extern __printf(2, 3) 1038 int _dev_info(const struct device *dev, const char *fmt, ...); 1039 1040 #else 1041 1042 static inline __printf(3, 0) 1043 int dev_vprintk_emit(int level, const struct device *dev, 1044 const char *fmt, va_list args) 1045 { return 0; } 1046 static inline __printf(3, 4) 1047 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) 1048 { return 0; } 1049 1050 static inline int __dev_printk(const char *level, const struct device *dev, 1051 struct va_format *vaf) 1052 { return 0; } 1053 static inline __printf(3, 4) 1054 int dev_printk(const char *level, const struct device *dev, 1055 const char *fmt, ...) 1056 { return 0; } 1057 1058 static inline __printf(2, 3) 1059 int dev_emerg(const struct device *dev, const char *fmt, ...) 1060 { return 0; } 1061 static inline __printf(2, 3) 1062 int dev_crit(const struct device *dev, const char *fmt, ...) 1063 { return 0; } 1064 static inline __printf(2, 3) 1065 int dev_alert(const struct device *dev, const char *fmt, ...) 1066 { return 0; } 1067 static inline __printf(2, 3) 1068 int dev_err(const struct device *dev, const char *fmt, ...) 1069 { return 0; } 1070 static inline __printf(2, 3) 1071 int dev_warn(const struct device *dev, const char *fmt, ...) 1072 { return 0; } 1073 static inline __printf(2, 3) 1074 int dev_notice(const struct device *dev, const char *fmt, ...) 1075 { return 0; } 1076 static inline __printf(2, 3) 1077 int _dev_info(const struct device *dev, const char *fmt, ...) 1078 { return 0; } 1079 1080 #endif 1081 1082 /* 1083 * Stupid hackaround for existing uses of non-printk uses dev_info 1084 * 1085 * Note that the definition of dev_info below is actually _dev_info 1086 * and a macro is used to avoid redefining dev_info 1087 */ 1088 1089 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg) 1090 1091 #if defined(CONFIG_DYNAMIC_DEBUG) 1092 #define dev_dbg(dev, format, ...) \ 1093 do { \ 1094 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \ 1095 } while (0) 1096 #elif defined(DEBUG) 1097 #define dev_dbg(dev, format, arg...) \ 1098 dev_printk(KERN_DEBUG, dev, format, ##arg) 1099 #else 1100 #define dev_dbg(dev, format, arg...) \ 1101 ({ \ 1102 if (0) \ 1103 dev_printk(KERN_DEBUG, dev, format, ##arg); \ 1104 0; \ 1105 }) 1106 #endif 1107 1108 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \ 1109 do { \ 1110 static DEFINE_RATELIMIT_STATE(_rs, \ 1111 DEFAULT_RATELIMIT_INTERVAL, \ 1112 DEFAULT_RATELIMIT_BURST); \ 1113 if (__ratelimit(&_rs)) \ 1114 dev_level(dev, fmt, ##__VA_ARGS__); \ 1115 } while (0) 1116 1117 #define dev_emerg_ratelimited(dev, fmt, ...) \ 1118 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__) 1119 #define dev_alert_ratelimited(dev, fmt, ...) \ 1120 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__) 1121 #define dev_crit_ratelimited(dev, fmt, ...) \ 1122 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__) 1123 #define dev_err_ratelimited(dev, fmt, ...) \ 1124 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__) 1125 #define dev_warn_ratelimited(dev, fmt, ...) \ 1126 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__) 1127 #define dev_notice_ratelimited(dev, fmt, ...) \ 1128 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__) 1129 #define dev_info_ratelimited(dev, fmt, ...) \ 1130 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__) 1131 #if defined(CONFIG_DYNAMIC_DEBUG) 1132 /* descriptor check is first to prevent flooding with "callbacks suppressed" */ 1133 #define dev_dbg_ratelimited(dev, fmt, ...) \ 1134 do { \ 1135 static DEFINE_RATELIMIT_STATE(_rs, \ 1136 DEFAULT_RATELIMIT_INTERVAL, \ 1137 DEFAULT_RATELIMIT_BURST); \ 1138 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ 1139 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \ 1140 __ratelimit(&_rs)) \ 1141 __dynamic_dev_dbg(&descriptor, dev, fmt, \ 1142 ##__VA_ARGS__); \ 1143 } while (0) 1144 #elif defined(DEBUG) 1145 #define dev_dbg_ratelimited(dev, fmt, ...) \ 1146 do { \ 1147 static DEFINE_RATELIMIT_STATE(_rs, \ 1148 DEFAULT_RATELIMIT_INTERVAL, \ 1149 DEFAULT_RATELIMIT_BURST); \ 1150 if (__ratelimit(&_rs)) \ 1151 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ 1152 } while (0) 1153 #else 1154 #define dev_dbg_ratelimited(dev, fmt, ...) \ 1155 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) 1156 #endif 1157 1158 #ifdef VERBOSE_DEBUG 1159 #define dev_vdbg dev_dbg 1160 #else 1161 #define dev_vdbg(dev, format, arg...) \ 1162 ({ \ 1163 if (0) \ 1164 dev_printk(KERN_DEBUG, dev, format, ##arg); \ 1165 0; \ 1166 }) 1167 #endif 1168 1169 /* 1170 * dev_WARN*() acts like dev_printk(), but with the key difference of 1171 * using WARN/WARN_ONCE to include file/line information and a backtrace. 1172 */ 1173 #define dev_WARN(dev, format, arg...) \ 1174 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg); 1175 1176 #define dev_WARN_ONCE(dev, condition, format, arg...) \ 1177 WARN_ONCE(condition, "%s %s: " format, \ 1178 dev_driver_string(dev), dev_name(dev), ## arg) 1179 1180 /* Create alias, so I can be autoloaded. */ 1181 #define MODULE_ALIAS_CHARDEV(major,minor) \ 1182 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) 1183 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \ 1184 MODULE_ALIAS("char-major-" __stringify(major) "-*") 1185 1186 #ifdef CONFIG_SYSFS_DEPRECATED 1187 extern long sysfs_deprecated; 1188 #else 1189 #define sysfs_deprecated 0 1190 #endif 1191 1192 /** 1193 * module_driver() - Helper macro for drivers that don't do anything 1194 * special in module init/exit. This eliminates a lot of boilerplate. 1195 * Each module may only use this macro once, and calling it replaces 1196 * module_init() and module_exit(). 1197 * 1198 * @__driver: driver name 1199 * @__register: register function for this driver type 1200 * @__unregister: unregister function for this driver type 1201 * @...: Additional arguments to be passed to __register and __unregister. 1202 * 1203 * Use this macro to construct bus specific macros for registering 1204 * drivers, and do not use it on its own. 1205 */ 1206 #define module_driver(__driver, __register, __unregister, ...) \ 1207 static int __init __driver##_init(void) \ 1208 { \ 1209 return __register(&(__driver) , ##__VA_ARGS__); \ 1210 } \ 1211 module_init(__driver##_init); \ 1212 static void __exit __driver##_exit(void) \ 1213 { \ 1214 __unregister(&(__driver) , ##__VA_ARGS__); \ 1215 } \ 1216 module_exit(__driver##_exit); 1217 1218 #endif /* _DEVICE_H_ */ 1219