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1da177e4 LT |
1 | /* |
2 | * device.h - generic, centralized driver model | |
3 | * | |
4 | * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> | |
b4028437 GKH |
5 | * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> |
6 | * Copyright (c) 2008-2009 Novell Inc. | |
1da177e4 LT |
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 | ||
1da177e4 LT |
16 | #include <linux/ioport.h> |
17 | #include <linux/kobject.h> | |
465c7a3a | 18 | #include <linux/klist.h> |
1da177e4 | 19 | #include <linux/list.h> |
d2a3b914 | 20 | #include <linux/lockdep.h> |
4a7fb636 | 21 | #include <linux/compiler.h> |
1da177e4 | 22 | #include <linux/types.h> |
de477254 | 23 | #include <linux/mutex.h> |
ab78029e | 24 | #include <linux/pinctrl/devinfo.h> |
1da177e4 | 25 | #include <linux/pm.h> |
60063497 | 26 | #include <linux/atomic.h> |
6ca04593 | 27 | #include <linux/ratelimit.h> |
3c2670e6 | 28 | #include <linux/uidgid.h> |
64c862a8 | 29 | #include <linux/gfp.h> |
c6dbaef2 | 30 | #include <asm/device.h> |
1da177e4 | 31 | |
1da177e4 | 32 | struct device; |
fb069a5d | 33 | struct device_private; |
1da177e4 | 34 | struct device_driver; |
e5dd1278 | 35 | struct driver_private; |
de477254 | 36 | struct module; |
1da177e4 | 37 | struct class; |
6b6e39a6 | 38 | struct subsys_private; |
b8c5cec2 | 39 | struct bus_type; |
d706c1b0 | 40 | struct device_node; |
ff21776d | 41 | struct iommu_ops; |
74416e1e | 42 | struct iommu_group; |
b8c5cec2 KS |
43 | |
44 | struct bus_attribute { | |
45 | struct attribute attr; | |
d462943a GKH |
46 | ssize_t (*show)(struct bus_type *bus, char *buf); |
47 | ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count); | |
b8c5cec2 KS |
48 | }; |
49 | ||
d462943a | 50 | #define BUS_ATTR(_name, _mode, _show, _store) \ |
ced321bf GKH |
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) | |
b8c5cec2 KS |
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 *); | |
1da177e4 | 60 | |
880ffb5c WG |
61 | /** |
62 | * struct bus_type - The bus type of the device | |
63 | * | |
64 | * @name: The name of the bus. | |
ca22e56d KS |
65 | * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id). |
66 | * @dev_root: Default device to use as the parent. | |
880ffb5c | 67 | * @dev_attrs: Default attributes of the devices on the bus. |
12478ba0 | 68 | * @bus_groups: Default attributes of the bus. |
fa6fdb33 | 69 | * @dev_groups: Default attributes of the devices on the bus. |
ed0617b5 | 70 | * @drv_groups: Default attributes of the device drivers on the bus. |
880ffb5c WG |
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. | |
4f3549d7 RW |
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 | * | |
880ffb5c WG |
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. | |
7b08fae8 | 88 | * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU |
ff21776d JR |
89 | * driver implementations to a bus and allow the driver to do |
90 | * bus-specific setup | |
880ffb5c WG |
91 | * @p: The private data of the driver core, only the driver core can |
92 | * touch this. | |
bfd63cd2 | 93 | * @lock_key: Lock class key for use by the lock validator |
880ffb5c WG |
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 | */ | |
1da177e4 | 104 | struct bus_type { |
d462943a | 105 | const char *name; |
ca22e56d KS |
106 | const char *dev_name; |
107 | struct device *dev_root; | |
fa6fdb33 | 108 | struct device_attribute *dev_attrs; /* use dev_groups instead */ |
12478ba0 | 109 | const struct attribute_group **bus_groups; |
fa6fdb33 | 110 | const struct attribute_group **dev_groups; |
ed0617b5 | 111 | const struct attribute_group **drv_groups; |
d462943a GKH |
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 | ||
4f3549d7 RW |
119 | int (*online)(struct device *dev); |
120 | int (*offline)(struct device *dev); | |
121 | ||
d462943a | 122 | int (*suspend)(struct device *dev, pm_message_t state); |
d462943a | 123 | int (*resume)(struct device *dev); |
b8c5cec2 | 124 | |
8150f32b | 125 | const struct dev_pm_ops *pm; |
1eede070 | 126 | |
ff21776d JR |
127 | struct iommu_ops *iommu_ops; |
128 | ||
6b6e39a6 | 129 | struct subsys_private *p; |
be871b7e | 130 | struct lock_class_key lock_key; |
1da177e4 LT |
131 | }; |
132 | ||
be871b7e MH |
133 | extern int __must_check bus_register(struct bus_type *bus); |
134 | ||
d462943a | 135 | extern void bus_unregister(struct bus_type *bus); |
1da177e4 | 136 | |
d462943a | 137 | extern int __must_check bus_rescan_devices(struct bus_type *bus); |
1da177e4 | 138 | |
1da177e4 | 139 | /* iterator helpers for buses */ |
ca22e56d KS |
140 | struct subsys_dev_iter { |
141 | struct klist_iter ki; | |
142 | const struct device_type *type; | |
143 | }; | |
7cd9c9bb | 144 | void subsys_dev_iter_init(struct subsys_dev_iter *iter, |
ca22e56d KS |
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); | |
1da177e4 | 150 | |
d462943a GKH |
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)); | |
1f9ffc04 GKH |
156 | struct device *bus_find_device_by_name(struct bus_type *bus, |
157 | struct device *start, | |
158 | const char *name); | |
ca22e56d KS |
159 | struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id, |
160 | struct device *hint); | |
cc7447a5 JD |
161 | int bus_for_each_drv(struct bus_type *bus, struct device_driver *start, |
162 | void *data, int (*fn)(struct device_driver *, void *)); | |
99178b03 GKH |
163 | void bus_sort_breadthfirst(struct bus_type *bus, |
164 | int (*compare)(const struct device *a, | |
165 | const struct device *b)); | |
116af378 BH |
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 | |
8e9394ce | 181 | * with the device lock held in the core, so be careful. |
116af378 BH |
182 | */ |
183 | #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */ | |
184 | #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */ | |
45daef0f MD |
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 | |
116af378 | 189 | unbound */ |
45daef0f | 190 | #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000006 /* driver is unbound |
309b7d60 | 191 | from the device */ |
116af378 | 192 | |
0fed80f7 | 193 | extern struct kset *bus_get_kset(struct bus_type *bus); |
b249072e | 194 | extern struct klist *bus_get_device_klist(struct bus_type *bus); |
0fed80f7 | 195 | |
880ffb5c WG |
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. | |
06f64c8f | 204 | * @acpi_match_table: The ACPI match table. |
880ffb5c WG |
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 | */ | |
1da177e4 | 228 | struct device_driver { |
e5dd1278 GKH |
229 | const char *name; |
230 | struct bus_type *bus; | |
1da177e4 | 231 | |
e5dd1278 | 232 | struct module *owner; |
1a6f2a75 DT |
233 | const char *mod_name; /* used for built-in modules */ |
234 | ||
235 | bool suppress_bind_attrs; /* disables bind/unbind via sysfs */ | |
1da177e4 | 236 | |
597b9d1e | 237 | const struct of_device_id *of_match_table; |
06f64c8f | 238 | const struct acpi_device_id *acpi_match_table; |
597b9d1e | 239 | |
d462943a GKH |
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); | |
a4dbd674 | 245 | const struct attribute_group **groups; |
e5dd1278 | 246 | |
8150f32b | 247 | const struct dev_pm_ops *pm; |
1eede070 | 248 | |
e5dd1278 | 249 | struct driver_private *p; |
1da177e4 LT |
250 | }; |
251 | ||
252 | ||
d462943a GKH |
253 | extern int __must_check driver_register(struct device_driver *drv); |
254 | extern void driver_unregister(struct device_driver *drv); | |
1da177e4 | 255 | |
d462943a GKH |
256 | extern struct device_driver *driver_find(const char *name, |
257 | struct bus_type *bus); | |
d779249e | 258 | extern int driver_probe_done(void); |
b23530eb | 259 | extern void wait_for_device_probe(void); |
216773a7 | 260 | |
1da177e4 | 261 | |
405ae7d3 | 262 | /* sysfs interface for exporting driver attributes */ |
1da177e4 LT |
263 | |
264 | struct driver_attribute { | |
d462943a GKH |
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); | |
1da177e4 LT |
269 | }; |
270 | ||
ced321bf GKH |
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) | |
1130c55c GKH |
277 | #define DRIVER_ATTR_WO(_name) \ |
278 | struct driver_attribute driver_attr_##_name = __ATTR_WO(_name) | |
1da177e4 | 279 | |
d462943a | 280 | extern int __must_check driver_create_file(struct device_driver *driver, |
099c2f21 | 281 | const struct driver_attribute *attr); |
d462943a | 282 | extern void driver_remove_file(struct device_driver *driver, |
099c2f21 | 283 | const struct driver_attribute *attr); |
1da177e4 | 284 | |
d462943a GKH |
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)); | |
fae3cd00 | 293 | |
ca22e56d KS |
294 | /** |
295 | * struct subsys_interface - interfaces to device functions | |
2eda013f RD |
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 | |
ca22e56d KS |
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); | |
d73ce004 TH |
320 | int subsys_virtual_register(struct bus_type *subsys, |
321 | const struct attribute_group **groups); | |
ca22e56d | 322 | |
880ffb5c WG |
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. | |
d05a6f96 | 328 | * @dev_groups: Default attributes of the devices that belong to the class. |
880ffb5c WG |
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. | |
1da177e4 LT |
350 | */ |
351 | struct class { | |
d462943a GKH |
352 | const char *name; |
353 | struct module *owner; | |
1da177e4 | 354 | |
d462943a | 355 | struct class_attribute *class_attrs; |
d05a6f96 | 356 | const struct attribute_group **dev_groups; |
e105b8bf | 357 | struct kobject *dev_kobj; |
1da177e4 | 358 | |
d462943a | 359 | int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env); |
2c9ede55 | 360 | char *(*devnode)(struct device *dev, umode_t *mode); |
1da177e4 | 361 | |
d462943a GKH |
362 | void (*class_release)(struct class *class); |
363 | void (*dev_release)(struct device *dev); | |
7c8265f5 | 364 | |
d462943a GKH |
365 | int (*suspend)(struct device *dev, pm_message_t state); |
366 | int (*resume)(struct device *dev); | |
1eede070 | 367 | |
bc451f20 EB |
368 | const struct kobj_ns_type_operations *ns_type; |
369 | const void *(*namespace)(struct device *dev); | |
370 | ||
8150f32b DT |
371 | const struct dev_pm_ops *pm; |
372 | ||
6b6e39a6 | 373 | struct subsys_private *p; |
1da177e4 LT |
374 | }; |
375 | ||
5a3ceb86 TH |
376 | struct class_dev_iter { |
377 | struct klist_iter ki; | |
378 | const struct device_type *type; | |
379 | }; | |
380 | ||
e105b8bf DW |
381 | extern struct kobject *sysfs_dev_block_kobj; |
382 | extern struct kobject *sysfs_dev_char_kobj; | |
d2a3b914 MW |
383 | extern int __must_check __class_register(struct class *class, |
384 | struct lock_class_key *key); | |
d462943a | 385 | extern void class_unregister(struct class *class); |
d2a3b914 MW |
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 | ||
46227094 JD |
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 | ||
7cd9c9bb GKH |
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); | |
5a3ceb86 TH |
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 | ||
93562b53 GKH |
410 | extern int class_for_each_device(struct class *class, struct device *start, |
411 | void *data, | |
fd04897b | 412 | int (*fn)(struct device *dev, void *data)); |
695794ae | 413 | extern struct device *class_find_device(struct class *class, |
9f3b795a MM |
414 | struct device *start, const void *data, |
415 | int (*match)(struct device *, const void *)); | |
1da177e4 LT |
416 | |
417 | struct class_attribute { | |
d462943a | 418 | struct attribute attr; |
28812fe1 AK |
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); | |
1da177e4 LT |
423 | }; |
424 | ||
ced321bf GKH |
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) | |
1da177e4 | 431 | |
58292cbe TH |
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 | } | |
1da177e4 | 450 | |
869dfc87 | 451 | /* Simple class attribute that is just a static string */ |
869dfc87 AK |
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 | ||
1da177e4 LT |
467 | struct class_interface { |
468 | struct list_head node; | |
469 | struct class *class; | |
470 | ||
c47ed219 GKH |
471 | int (*add_dev) (struct device *, struct class_interface *); |
472 | void (*remove_dev) (struct device *, struct class_interface *); | |
1da177e4 LT |
473 | }; |
474 | ||
4a7fb636 | 475 | extern int __must_check class_interface_register(struct class_interface *); |
1da177e4 LT |
476 | extern void class_interface_unregister(struct class_interface *); |
477 | ||
d2a3b914 MW |
478 | extern struct class * __must_check __class_create(struct module *owner, |
479 | const char *name, | |
480 | struct lock_class_key *key); | |
e9ba6365 | 481 | extern void class_destroy(struct class *cls); |
e9ba6365 | 482 | |
d2a3b914 MW |
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 | ||
414264f9 KS |
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 | */ | |
f9f852df | 500 | struct device_type { |
414264f9 | 501 | const char *name; |
a4dbd674 | 502 | const struct attribute_group **groups; |
7eff2e7a | 503 | int (*uevent)(struct device *dev, struct kobj_uevent_env *env); |
3c2670e6 | 504 | char *(*devnode)(struct device *dev, umode_t *mode, |
4e4098a3 | 505 | kuid_t *uid, kgid_t *gid); |
f9f852df | 506 | void (*release)(struct device *dev); |
1eede070 | 507 | |
8150f32b | 508 | const struct dev_pm_ops *pm; |
f9f852df KS |
509 | }; |
510 | ||
a7fd6706 KS |
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 | ||
ca22e56d KS |
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); | |
91872392 BP |
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); | |
a7fd6706 | 537 | |
d462943a | 538 | #define DEVICE_ATTR(_name, _mode, _show, _store) \ |
ca22e56d | 539 | struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store) |
ced321bf GKH |
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) | |
1130c55c GKH |
544 | #define DEVICE_ATTR_WO(_name) \ |
545 | struct device_attribute dev_attr_##_name = __ATTR_WO(_name) | |
ca22e56d KS |
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 = \ | |
94758185 | 551 | { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) } |
91872392 BP |
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) } | |
356c05d5 AS |
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) | |
a7fd6706 | 558 | |
b9d4e714 GKH |
559 | extern int device_create_file(struct device *device, |
560 | const struct device_attribute *entry); | |
d462943a | 561 | extern void device_remove_file(struct device *dev, |
26579ab7 | 562 | const struct device_attribute *attr); |
2589f188 | 563 | extern int __must_check device_create_bin_file(struct device *dev, |
66ecb92b | 564 | const struct bin_attribute *attr); |
2589f188 | 565 | extern void device_remove_bin_file(struct device *dev, |
66ecb92b | 566 | const struct bin_attribute *attr); |
523ded71 | 567 | extern int device_schedule_callback_owner(struct device *dev, |
d462943a | 568 | void (*func)(struct device *dev), struct module *owner); |
523ded71 AS |
569 | |
570 | /* This is a macro to avoid include problems with THIS_MODULE */ | |
571 | #define device_schedule_callback(dev, func) \ | |
572 | device_schedule_callback_owner(dev, func, THIS_MODULE) | |
9ac7849e TH |
573 | |
574 | /* device resource management */ | |
575 | typedef void (*dr_release_t)(struct device *dev, void *res); | |
576 | typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data); | |
577 | ||
578 | #ifdef CONFIG_DEBUG_DEVRES | |
d462943a | 579 | extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp, |
9ac7849e TH |
580 | const char *name); |
581 | #define devres_alloc(release, size, gfp) \ | |
582 | __devres_alloc(release, size, gfp, #release) | |
583 | #else | |
d462943a | 584 | extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp); |
9ac7849e | 585 | #endif |
bddb1b90 ML |
586 | extern void devres_for_each_res(struct device *dev, dr_release_t release, |
587 | dr_match_t match, void *match_data, | |
588 | void (*fn)(struct device *, void *, void *), | |
589 | void *data); | |
9ac7849e TH |
590 | extern void devres_free(void *res); |
591 | extern void devres_add(struct device *dev, void *res); | |
d462943a | 592 | extern void *devres_find(struct device *dev, dr_release_t release, |
9ac7849e | 593 | dr_match_t match, void *match_data); |
d462943a GKH |
594 | extern void *devres_get(struct device *dev, void *new_res, |
595 | dr_match_t match, void *match_data); | |
596 | extern void *devres_remove(struct device *dev, dr_release_t release, | |
597 | dr_match_t match, void *match_data); | |
9ac7849e TH |
598 | extern int devres_destroy(struct device *dev, dr_release_t release, |
599 | dr_match_t match, void *match_data); | |
d926d0e4 MB |
600 | extern int devres_release(struct device *dev, dr_release_t release, |
601 | dr_match_t match, void *match_data); | |
9ac7849e TH |
602 | |
603 | /* devres group */ | |
604 | extern void * __must_check devres_open_group(struct device *dev, void *id, | |
605 | gfp_t gfp); | |
606 | extern void devres_close_group(struct device *dev, void *id); | |
607 | extern void devres_remove_group(struct device *dev, void *id); | |
608 | extern int devres_release_group(struct device *dev, void *id); | |
609 | ||
64c862a8 JP |
610 | /* managed devm_k.alloc/kfree for device drivers */ |
611 | extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp); | |
612 | static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp) | |
613 | { | |
614 | return devm_kmalloc(dev, size, gfp | __GFP_ZERO); | |
615 | } | |
616 | static inline void *devm_kmalloc_array(struct device *dev, | |
617 | size_t n, size_t size, gfp_t flags) | |
618 | { | |
619 | if (size != 0 && n > SIZE_MAX / size) | |
620 | return NULL; | |
621 | return devm_kmalloc(dev, n * size, flags); | |
622 | } | |
623 | static inline void *devm_kcalloc(struct device *dev, | |
624 | size_t n, size_t size, gfp_t flags) | |
625 | { | |
626 | return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO); | |
627 | } | |
9ac7849e TH |
628 | extern void devm_kfree(struct device *dev, void *p); |
629 | ||
75096579 | 630 | void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res); |
72f8c0bf WS |
631 | void __iomem *devm_request_and_ioremap(struct device *dev, |
632 | struct resource *res); | |
633 | ||
d6b0c580 DT |
634 | /* allows to add/remove a custom action to devres stack */ |
635 | int devm_add_action(struct device *dev, void (*action)(void *), void *data); | |
636 | void devm_remove_action(struct device *dev, void (*action)(void *), void *data); | |
637 | ||
6b7b6510 FT |
638 | struct device_dma_parameters { |
639 | /* | |
640 | * a low level driver may set these to teach IOMMU code about | |
641 | * sg limitations. | |
642 | */ | |
643 | unsigned int max_segment_size; | |
644 | unsigned long segment_boundary_mask; | |
645 | }; | |
646 | ||
7b199811 RW |
647 | struct acpi_device; |
648 | ||
95f8a082 RW |
649 | struct acpi_dev_node { |
650 | #ifdef CONFIG_ACPI | |
7b199811 | 651 | struct acpi_device *companion; |
95f8a082 RW |
652 | #endif |
653 | }; | |
654 | ||
880ffb5c WG |
655 | /** |
656 | * struct device - The basic device structure | |
657 | * @parent: The device's "parent" device, the device to which it is attached. | |
658 | * In most cases, a parent device is some sort of bus or host | |
659 | * controller. If parent is NULL, the device, is a top-level device, | |
660 | * which is not usually what you want. | |
661 | * @p: Holds the private data of the driver core portions of the device. | |
662 | * See the comment of the struct device_private for detail. | |
663 | * @kobj: A top-level, abstract class from which other classes are derived. | |
664 | * @init_name: Initial name of the device. | |
665 | * @type: The type of device. | |
666 | * This identifies the device type and carries type-specific | |
667 | * information. | |
668 | * @mutex: Mutex to synchronize calls to its driver. | |
669 | * @bus: Type of bus device is on. | |
670 | * @driver: Which driver has allocated this | |
671 | * @platform_data: Platform data specific to the device. | |
672 | * Example: For devices on custom boards, as typical of embedded | |
673 | * and SOC based hardware, Linux often uses platform_data to point | |
674 | * to board-specific structures describing devices and how they | |
675 | * are wired. That can include what ports are available, chip | |
676 | * variants, which GPIO pins act in what additional roles, and so | |
677 | * on. This shrinks the "Board Support Packages" (BSPs) and | |
678 | * minimizes board-specific #ifdefs in drivers. | |
679 | * @power: For device power management. | |
680 | * See Documentation/power/devices.txt for details. | |
564b905a | 681 | * @pm_domain: Provide callbacks that are executed during system suspend, |
880ffb5c WG |
682 | * hibernation, system resume and during runtime PM transitions |
683 | * along with subsystem-level and driver-level callbacks. | |
ab78029e LW |
684 | * @pins: For device pin management. |
685 | * See Documentation/pinctrl.txt for details. | |
880ffb5c WG |
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_parms: A low level driver may set these to teach IOMMU code about | |
692 | * segment limitations. | |
693 | * @dma_pools: Dma pools (if dma'ble device). | |
694 | * @dma_mem: Internal for coherent mem override. | |
bfd63cd2 | 695 | * @cma_area: Contiguous memory area for dma allocations |
880ffb5c WG |
696 | * @archdata: For arch-specific additions. |
697 | * @of_node: Associated device tree node. | |
95f8a082 | 698 | * @acpi_node: Associated ACPI device node. |
880ffb5c | 699 | * @devt: For creating the sysfs "dev". |
2eda013f | 700 | * @id: device instance |
880ffb5c WG |
701 | * @devres_lock: Spinlock to protect the resource of the device. |
702 | * @devres_head: The resources list of the device. | |
703 | * @knode_class: The node used to add the device to the class list. | |
704 | * @class: The class of the device. | |
705 | * @groups: Optional attribute groups. | |
706 | * @release: Callback to free the device after all references have | |
707 | * gone away. This should be set by the allocator of the | |
708 | * device (i.e. the bus driver that discovered the device). | |
bfd63cd2 | 709 | * @iommu_group: IOMMU group the device belongs to. |
880ffb5c | 710 | * |
4f3549d7 RW |
711 | * @offline_disabled: If set, the device is permanently online. |
712 | * @offline: Set after successful invocation of bus type's .offline(). | |
880ffb5c WG |
713 | * |
714 | * At the lowest level, every device in a Linux system is represented by an | |
715 | * instance of struct device. The device structure contains the information | |
716 | * that the device model core needs to model the system. Most subsystems, | |
717 | * however, track additional information about the devices they host. As a | |
718 | * result, it is rare for devices to be represented by bare device structures; | |
719 | * instead, that structure, like kobject structures, is usually embedded within | |
720 | * a higher-level representation of the device. | |
721 | */ | |
1da177e4 | 722 | struct device { |
49a4ec18 | 723 | struct device *parent; |
1da177e4 | 724 | |
fb069a5d GKH |
725 | struct device_private *p; |
726 | ||
1da177e4 | 727 | struct kobject kobj; |
c906a48a | 728 | const char *init_name; /* initial name of the device */ |
aed65af1 | 729 | const struct device_type *type; |
1da177e4 | 730 | |
3142788b | 731 | struct mutex mutex; /* mutex to synchronize calls to |
af70316a | 732 | * its driver. |
733 | */ | |
734 | ||
d462943a | 735 | struct bus_type *bus; /* type of bus device is on */ |
1da177e4 LT |
736 | struct device_driver *driver; /* which driver has allocated this |
737 | device */ | |
e67c8562 GKH |
738 | void *platform_data; /* Platform specific data, device |
739 | core doesn't touch it */ | |
1da177e4 | 740 | struct dev_pm_info power; |
564b905a | 741 | struct dev_pm_domain *pm_domain; |
1da177e4 | 742 | |
ab78029e LW |
743 | #ifdef CONFIG_PINCTRL |
744 | struct dev_pin_info *pins; | |
745 | #endif | |
746 | ||
87348136 CH |
747 | #ifdef CONFIG_NUMA |
748 | int numa_node; /* NUMA node this device is close to */ | |
749 | #endif | |
1da177e4 LT |
750 | u64 *dma_mask; /* dma mask (if dma'able device) */ |
751 | u64 coherent_dma_mask;/* Like dma_mask, but for | |
752 | alloc_coherent mappings as | |
753 | not all hardware supports | |
754 | 64 bit addresses for consistent | |
755 | allocations such descriptors. */ | |
756 | ||
6b7b6510 FT |
757 | struct device_dma_parameters *dma_parms; |
758 | ||
1da177e4 LT |
759 | struct list_head dma_pools; /* dma pools (if dma'ble) */ |
760 | ||
761 | struct dma_coherent_mem *dma_mem; /* internal for coherent mem | |
762 | override */ | |
a2547380 | 763 | #ifdef CONFIG_DMA_CMA |
c64be2bb MS |
764 | struct cma *cma_area; /* contiguous memory area for dma |
765 | allocations */ | |
766 | #endif | |
c6dbaef2 BH |
767 | /* arch specific additions */ |
768 | struct dev_archdata archdata; | |
c9e358df GL |
769 | |
770 | struct device_node *of_node; /* associated device tree node */ | |
95f8a082 | 771 | struct acpi_dev_node acpi_node; /* associated ACPI device node */ |
1da177e4 | 772 | |
929d2fa5 | 773 | dev_t devt; /* dev_t, creates the sysfs "dev" */ |
ca22e56d | 774 | u32 id; /* device instance */ |
929d2fa5 | 775 | |
9ac7849e TH |
776 | spinlock_t devres_lock; |
777 | struct list_head devres_head; | |
778 | ||
5a3ceb86 | 779 | struct klist_node knode_class; |
b7a3e813 | 780 | struct class *class; |
a4dbd674 | 781 | const struct attribute_group **groups; /* optional groups */ |
23681e47 | 782 | |
d462943a | 783 | void (*release)(struct device *dev); |
74416e1e | 784 | struct iommu_group *iommu_group; |
4f3549d7 RW |
785 | |
786 | bool offline_disabled:1; | |
787 | bool offline:1; | |
1da177e4 LT |
788 | }; |
789 | ||
a4232963 LPC |
790 | static inline struct device *kobj_to_dev(struct kobject *kobj) |
791 | { | |
792 | return container_of(kobj, struct device, kobj); | |
793 | } | |
794 | ||
9a3df1f7 AS |
795 | /* Get the wakeup routines, which depend on struct device */ |
796 | #include <linux/pm_wakeup.h> | |
797 | ||
bf9ca69f | 798 | static inline const char *dev_name(const struct device *dev) |
06916639 | 799 | { |
a636ee7f PM |
800 | /* Use the init name until the kobject becomes available */ |
801 | if (dev->init_name) | |
802 | return dev->init_name; | |
803 | ||
1fa5ae85 | 804 | return kobject_name(&dev->kobj); |
06916639 KS |
805 | } |
806 | ||
b9075fa9 JP |
807 | extern __printf(2, 3) |
808 | int dev_set_name(struct device *dev, const char *name, ...); | |
413c239f | 809 | |
87348136 CH |
810 | #ifdef CONFIG_NUMA |
811 | static inline int dev_to_node(struct device *dev) | |
812 | { | |
813 | return dev->numa_node; | |
814 | } | |
815 | static inline void set_dev_node(struct device *dev, int node) | |
816 | { | |
817 | dev->numa_node = node; | |
818 | } | |
819 | #else | |
820 | static inline int dev_to_node(struct device *dev) | |
821 | { | |
822 | return -1; | |
823 | } | |
824 | static inline void set_dev_node(struct device *dev, int node) | |
825 | { | |
826 | } | |
827 | #endif | |
828 | ||
5c095a0e RW |
829 | static inline struct pm_subsys_data *dev_to_psd(struct device *dev) |
830 | { | |
831 | return dev ? dev->power.subsys_data : NULL; | |
832 | } | |
833 | ||
f67f129e ML |
834 | static inline unsigned int dev_get_uevent_suppress(const struct device *dev) |
835 | { | |
836 | return dev->kobj.uevent_suppress; | |
837 | } | |
838 | ||
839 | static inline void dev_set_uevent_suppress(struct device *dev, int val) | |
840 | { | |
841 | dev->kobj.uevent_suppress = val; | |
842 | } | |
843 | ||
d305ef5d DR |
844 | static inline int device_is_registered(struct device *dev) |
845 | { | |
3f62e570 | 846 | return dev->kobj.state_in_sysfs; |
d305ef5d DR |
847 | } |
848 | ||
5af84b82 RW |
849 | static inline void device_enable_async_suspend(struct device *dev) |
850 | { | |
f76b168b | 851 | if (!dev->power.is_prepared) |
5af84b82 RW |
852 | dev->power.async_suspend = true; |
853 | } | |
854 | ||
5a2eb858 RW |
855 | static inline void device_disable_async_suspend(struct device *dev) |
856 | { | |
f76b168b | 857 | if (!dev->power.is_prepared) |
5a2eb858 RW |
858 | dev->power.async_suspend = false; |
859 | } | |
860 | ||
861 | static inline bool device_async_suspend_enabled(struct device *dev) | |
862 | { | |
863 | return !!dev->power.async_suspend; | |
864 | } | |
865 | ||
8b258cc8 RW |
866 | static inline void pm_suspend_ignore_children(struct device *dev, bool enable) |
867 | { | |
868 | dev->power.ignore_children = enable; | |
869 | } | |
870 | ||
feb70af0 RW |
871 | static inline void dev_pm_syscore_device(struct device *dev, bool val) |
872 | { | |
873 | #ifdef CONFIG_PM_SLEEP | |
874 | dev->power.syscore = val; | |
875 | #endif | |
876 | } | |
877 | ||
8e9394ce GKH |
878 | static inline void device_lock(struct device *dev) |
879 | { | |
3142788b | 880 | mutex_lock(&dev->mutex); |
8e9394ce GKH |
881 | } |
882 | ||
883 | static inline int device_trylock(struct device *dev) | |
884 | { | |
3142788b | 885 | return mutex_trylock(&dev->mutex); |
8e9394ce GKH |
886 | } |
887 | ||
888 | static inline void device_unlock(struct device *dev) | |
889 | { | |
3142788b | 890 | mutex_unlock(&dev->mutex); |
8e9394ce GKH |
891 | } |
892 | ||
1f21782e AB |
893 | void driver_init(void); |
894 | ||
1da177e4 LT |
895 | /* |
896 | * High level routines for use by the bus drivers | |
897 | */ | |
d462943a GKH |
898 | extern int __must_check device_register(struct device *dev); |
899 | extern void device_unregister(struct device *dev); | |
900 | extern void device_initialize(struct device *dev); | |
901 | extern int __must_check device_add(struct device *dev); | |
902 | extern void device_del(struct device *dev); | |
903 | extern int device_for_each_child(struct device *dev, void *data, | |
904 | int (*fn)(struct device *dev, void *data)); | |
905 | extern struct device *device_find_child(struct device *dev, void *data, | |
906 | int (*match)(struct device *dev, void *data)); | |
6937e8f8 | 907 | extern int device_rename(struct device *dev, const char *new_name); |
ffa6a705 CH |
908 | extern int device_move(struct device *dev, struct device *new_parent, |
909 | enum dpm_order dpm_order); | |
e454cea2 | 910 | extern const char *device_get_devnode(struct device *dev, |
4e4098a3 | 911 | umode_t *mode, kuid_t *uid, kgid_t *gid, |
3c2670e6 | 912 | const char **tmp); |
b4028437 | 913 | extern void *dev_get_drvdata(const struct device *dev); |
c8705082 | 914 | extern int dev_set_drvdata(struct device *dev, void *data); |
1da177e4 | 915 | |
4f3549d7 RW |
916 | static inline bool device_supports_offline(struct device *dev) |
917 | { | |
918 | return dev->bus && dev->bus->offline && dev->bus->online; | |
919 | } | |
920 | ||
921 | extern void lock_device_hotplug(void); | |
922 | extern void unlock_device_hotplug(void); | |
5e33bc41 | 923 | extern int lock_device_hotplug_sysfs(void); |
4f3549d7 RW |
924 | extern int device_offline(struct device *dev); |
925 | extern int device_online(struct device *dev); | |
0aa0dc41 MM |
926 | /* |
927 | * Root device objects for grouping under /sys/devices | |
928 | */ | |
929 | extern struct device *__root_device_register(const char *name, | |
930 | struct module *owner); | |
eb5589a8 PG |
931 | |
932 | /* | |
933 | * This is a macro to avoid include problems with THIS_MODULE, | |
934 | * just as per what is done for device_schedule_callback() above. | |
935 | */ | |
936 | #define root_device_register(name) \ | |
937 | __root_device_register(name, THIS_MODULE) | |
938 | ||
0aa0dc41 MM |
939 | extern void root_device_unregister(struct device *root); |
940 | ||
a5b8b1ad MB |
941 | static inline void *dev_get_platdata(const struct device *dev) |
942 | { | |
943 | return dev->platform_data; | |
944 | } | |
945 | ||
1da177e4 LT |
946 | /* |
947 | * Manual binding of a device to driver. See drivers/base/bus.c | |
948 | * for information on use. | |
949 | */ | |
f86db396 | 950 | extern int __must_check device_bind_driver(struct device *dev); |
d462943a GKH |
951 | extern void device_release_driver(struct device *dev); |
952 | extern int __must_check device_attach(struct device *dev); | |
f86db396 AM |
953 | extern int __must_check driver_attach(struct device_driver *drv); |
954 | extern int __must_check device_reprobe(struct device *dev); | |
1da177e4 | 955 | |
23681e47 GKH |
956 | /* |
957 | * Easy functions for dynamically creating devices on the fly | |
958 | */ | |
8882b394 GKH |
959 | extern struct device *device_create_vargs(struct class *cls, |
960 | struct device *parent, | |
961 | dev_t devt, | |
962 | void *drvdata, | |
963 | const char *fmt, | |
964 | va_list vargs); | |
b9075fa9 JP |
965 | extern __printf(5, 6) |
966 | struct device *device_create(struct class *cls, struct device *parent, | |
967 | dev_t devt, void *drvdata, | |
968 | const char *fmt, ...); | |
39ef3112 GR |
969 | extern __printf(6, 7) |
970 | struct device *device_create_with_groups(struct class *cls, | |
971 | struct device *parent, dev_t devt, void *drvdata, | |
972 | const struct attribute_group **groups, | |
973 | const char *fmt, ...); | |
23681e47 | 974 | extern void device_destroy(struct class *cls, dev_t devt); |
1da177e4 | 975 | |
1da177e4 LT |
976 | /* |
977 | * Platform "fixup" functions - allow the platform to have their say | |
978 | * about devices and actions that the general device layer doesn't | |
979 | * know about. | |
980 | */ | |
981 | /* Notify platform of device discovery */ | |
d462943a | 982 | extern int (*platform_notify)(struct device *dev); |
1da177e4 | 983 | |
d462943a | 984 | extern int (*platform_notify_remove)(struct device *dev); |
1da177e4 LT |
985 | |
986 | ||
880ffb5c | 987 | /* |
1da177e4 LT |
988 | * get_device - atomically increment the reference count for the device. |
989 | * | |
990 | */ | |
d462943a GKH |
991 | extern struct device *get_device(struct device *dev); |
992 | extern void put_device(struct device *dev); | |
1da177e4 | 993 | |
2b2af54a KS |
994 | #ifdef CONFIG_DEVTMPFS |
995 | extern int devtmpfs_create_node(struct device *dev); | |
996 | extern int devtmpfs_delete_node(struct device *dev); | |
073120cc | 997 | extern int devtmpfs_mount(const char *mntdir); |
2b2af54a KS |
998 | #else |
999 | static inline int devtmpfs_create_node(struct device *dev) { return 0; } | |
1000 | static inline int devtmpfs_delete_node(struct device *dev) { return 0; } | |
1001 | static inline int devtmpfs_mount(const char *mountpoint) { return 0; } | |
1002 | #endif | |
1003 | ||
116f232b | 1004 | /* drivers/base/power/shutdown.c */ |
1da177e4 LT |
1005 | extern void device_shutdown(void); |
1006 | ||
1da177e4 | 1007 | /* debugging and troubleshooting/diagnostic helpers. */ |
bf9ca69f | 1008 | extern const char *dev_driver_string(const struct device *dev); |
99bcf217 JP |
1009 | |
1010 | ||
1011 | #ifdef CONFIG_PRINTK | |
1012 | ||
0a18b050 JP |
1013 | extern __printf(3, 0) |
1014 | int dev_vprintk_emit(int level, const struct device *dev, | |
1015 | const char *fmt, va_list args); | |
05e4e5b8 JP |
1016 | extern __printf(3, 4) |
1017 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...); | |
798efc60 | 1018 | |
b9075fa9 JP |
1019 | extern __printf(3, 4) |
1020 | int dev_printk(const char *level, const struct device *dev, | |
798efc60 | 1021 | const char *fmt, ...); |
b9075fa9 JP |
1022 | extern __printf(2, 3) |
1023 | int dev_emerg(const struct device *dev, const char *fmt, ...); | |
1024 | extern __printf(2, 3) | |
1025 | int dev_alert(const struct device *dev, const char *fmt, ...); | |
1026 | extern __printf(2, 3) | |
1027 | int dev_crit(const struct device *dev, const char *fmt, ...); | |
1028 | extern __printf(2, 3) | |
1029 | int dev_err(const struct device *dev, const char *fmt, ...); | |
1030 | extern __printf(2, 3) | |
1031 | int dev_warn(const struct device *dev, const char *fmt, ...); | |
1032 | extern __printf(2, 3) | |
1033 | int dev_notice(const struct device *dev, const char *fmt, ...); | |
1034 | extern __printf(2, 3) | |
1035 | int _dev_info(const struct device *dev, const char *fmt, ...); | |
99bcf217 JP |
1036 | |
1037 | #else | |
1038 | ||
0a18b050 JP |
1039 | static inline __printf(3, 0) |
1040 | int dev_vprintk_emit(int level, const struct device *dev, | |
1041 | const char *fmt, va_list args) | |
05e4e5b8 JP |
1042 | { return 0; } |
1043 | static inline __printf(3, 4) | |
1044 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | |
1045 | { return 0; } | |
1046 | ||
cbc46635 JP |
1047 | static inline int __dev_printk(const char *level, const struct device *dev, |
1048 | struct va_format *vaf) | |
b9075fa9 JP |
1049 | { return 0; } |
1050 | static inline __printf(3, 4) | |
1051 | int dev_printk(const char *level, const struct device *dev, | |
1052 | const char *fmt, ...) | |
1053 | { return 0; } | |
1054 | ||
1055 | static inline __printf(2, 3) | |
1056 | int dev_emerg(const struct device *dev, const char *fmt, ...) | |
1057 | { return 0; } | |
1058 | static inline __printf(2, 3) | |
1059 | int dev_crit(const struct device *dev, const char *fmt, ...) | |
1060 | { return 0; } | |
1061 | static inline __printf(2, 3) | |
1062 | int dev_alert(const struct device *dev, const char *fmt, ...) | |
1063 | { return 0; } | |
1064 | static inline __printf(2, 3) | |
1065 | int dev_err(const struct device *dev, const char *fmt, ...) | |
1066 | { return 0; } | |
1067 | static inline __printf(2, 3) | |
1068 | int dev_warn(const struct device *dev, const char *fmt, ...) | |
1069 | { return 0; } | |
1070 | static inline __printf(2, 3) | |
1071 | int dev_notice(const struct device *dev, const char *fmt, ...) | |
1072 | { return 0; } | |
1073 | static inline __printf(2, 3) | |
1074 | int _dev_info(const struct device *dev, const char *fmt, ...) | |
1075 | { return 0; } | |
99bcf217 JP |
1076 | |
1077 | #endif | |
1078 | ||
6f586e66 HD |
1079 | /* |
1080 | * Stupid hackaround for existing uses of non-printk uses dev_info | |
1081 | * | |
1082 | * Note that the definition of dev_info below is actually _dev_info | |
1083 | * and a macro is used to avoid redefining dev_info | |
1084 | */ | |
1085 | ||
1086 | #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg) | |
1087 | ||
1088 | #if defined(CONFIG_DYNAMIC_DEBUG) | |
1089 | #define dev_dbg(dev, format, ...) \ | |
1090 | do { \ | |
1091 | dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \ | |
1092 | } while (0) | |
1093 | #elif defined(DEBUG) | |
1094 | #define dev_dbg(dev, format, arg...) \ | |
1095 | dev_printk(KERN_DEBUG, dev, format, ##arg) | |
1096 | #else | |
1097 | #define dev_dbg(dev, format, arg...) \ | |
1098 | ({ \ | |
1099 | if (0) \ | |
1100 | dev_printk(KERN_DEBUG, dev, format, ##arg); \ | |
1101 | 0; \ | |
1102 | }) | |
1103 | #endif | |
1104 | ||
6ca04593 HD |
1105 | #define dev_level_ratelimited(dev_level, dev, fmt, ...) \ |
1106 | do { \ | |
1107 | static DEFINE_RATELIMIT_STATE(_rs, \ | |
1108 | DEFAULT_RATELIMIT_INTERVAL, \ | |
1109 | DEFAULT_RATELIMIT_BURST); \ | |
1110 | if (__ratelimit(&_rs)) \ | |
1111 | dev_level(dev, fmt, ##__VA_ARGS__); \ | |
1112 | } while (0) | |
1113 | ||
1114 | #define dev_emerg_ratelimited(dev, fmt, ...) \ | |
1115 | dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__) | |
1116 | #define dev_alert_ratelimited(dev, fmt, ...) \ | |
1117 | dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__) | |
1118 | #define dev_crit_ratelimited(dev, fmt, ...) \ | |
1119 | dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__) | |
1120 | #define dev_err_ratelimited(dev, fmt, ...) \ | |
1121 | dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__) | |
1122 | #define dev_warn_ratelimited(dev, fmt, ...) \ | |
1123 | dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__) | |
1124 | #define dev_notice_ratelimited(dev, fmt, ...) \ | |
1125 | dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__) | |
1126 | #define dev_info_ratelimited(dev, fmt, ...) \ | |
1127 | dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__) | |
8ef2d651 DK |
1128 | #if defined(CONFIG_DYNAMIC_DEBUG) |
1129 | /* descriptor check is first to prevent flooding with "callbacks suppressed" */ | |
6ca04593 | 1130 | #define dev_dbg_ratelimited(dev, fmt, ...) \ |
6f586e66 HD |
1131 | do { \ |
1132 | static DEFINE_RATELIMIT_STATE(_rs, \ | |
1133 | DEFAULT_RATELIMIT_INTERVAL, \ | |
1134 | DEFAULT_RATELIMIT_BURST); \ | |
1135 | DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ | |
1136 | if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \ | |
1137 | __ratelimit(&_rs)) \ | |
8ef2d651 DK |
1138 | __dynamic_dev_dbg(&descriptor, dev, fmt, \ |
1139 | ##__VA_ARGS__); \ | |
1140 | } while (0) | |
1141 | #elif defined(DEBUG) | |
1142 | #define dev_dbg_ratelimited(dev, fmt, ...) \ | |
1143 | do { \ | |
1144 | static DEFINE_RATELIMIT_STATE(_rs, \ | |
1145 | DEFAULT_RATELIMIT_INTERVAL, \ | |
1146 | DEFAULT_RATELIMIT_BURST); \ | |
1147 | if (__ratelimit(&_rs)) \ | |
1148 | dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \ | |
99bcf217 | 1149 | } while (0) |
1da177e4 | 1150 | #else |
6f586e66 HD |
1151 | #define dev_dbg_ratelimited(dev, fmt, ...) \ |
1152 | no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) | |
1da177e4 LT |
1153 | #endif |
1154 | ||
aebdc3b4 DB |
1155 | #ifdef VERBOSE_DEBUG |
1156 | #define dev_vdbg dev_dbg | |
1157 | #else | |
99bcf217 JP |
1158 | #define dev_vdbg(dev, format, arg...) \ |
1159 | ({ \ | |
1160 | if (0) \ | |
1161 | dev_printk(KERN_DEBUG, dev, format, ##arg); \ | |
1162 | 0; \ | |
1163 | }) | |
aebdc3b4 DB |
1164 | #endif |
1165 | ||
e6139662 | 1166 | /* |
3eae1367 BH |
1167 | * dev_WARN*() acts like dev_printk(), but with the key difference of |
1168 | * using WARN/WARN_ONCE to include file/line information and a backtrace. | |
e6139662 AV |
1169 | */ |
1170 | #define dev_WARN(dev, format, arg...) \ | |
3eae1367 | 1171 | WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg); |
e6139662 | 1172 | |
bcdd323b | 1173 | #define dev_WARN_ONCE(dev, condition, format, arg...) \ |
3eae1367 BH |
1174 | WARN_ONCE(condition, "%s %s: " format, \ |
1175 | dev_driver_string(dev), dev_name(dev), ## arg) | |
bcdd323b | 1176 | |
1da177e4 LT |
1177 | /* Create alias, so I can be autoloaded. */ |
1178 | #define MODULE_ALIAS_CHARDEV(major,minor) \ | |
1179 | MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) | |
1180 | #define MODULE_ALIAS_CHARDEV_MAJOR(major) \ | |
1181 | MODULE_ALIAS("char-major-" __stringify(major) "-*") | |
e52eec13 AK |
1182 | |
1183 | #ifdef CONFIG_SYSFS_DEPRECATED | |
1184 | extern long sysfs_deprecated; | |
1185 | #else | |
1186 | #define sysfs_deprecated 0 | |
1187 | #endif | |
1188 | ||
907d0ed1 LPC |
1189 | /** |
1190 | * module_driver() - Helper macro for drivers that don't do anything | |
1191 | * special in module init/exit. This eliminates a lot of boilerplate. | |
1192 | * Each module may only use this macro once, and calling it replaces | |
1193 | * module_init() and module_exit(). | |
1194 | * | |
2eda013f RD |
1195 | * @__driver: driver name |
1196 | * @__register: register function for this driver type | |
1197 | * @__unregister: unregister function for this driver type | |
cd494618 | 1198 | * @...: Additional arguments to be passed to __register and __unregister. |
2eda013f | 1199 | * |
907d0ed1 LPC |
1200 | * Use this macro to construct bus specific macros for registering |
1201 | * drivers, and do not use it on its own. | |
1202 | */ | |
cd494618 | 1203 | #define module_driver(__driver, __register, __unregister, ...) \ |
907d0ed1 LPC |
1204 | static int __init __driver##_init(void) \ |
1205 | { \ | |
cd494618 | 1206 | return __register(&(__driver) , ##__VA_ARGS__); \ |
907d0ed1 LPC |
1207 | } \ |
1208 | module_init(__driver##_init); \ | |
1209 | static void __exit __driver##_exit(void) \ | |
1210 | { \ | |
cd494618 | 1211 | __unregister(&(__driver) , ##__VA_ARGS__); \ |
907d0ed1 LPC |
1212 | } \ |
1213 | module_exit(__driver##_exit); | |
1214 | ||
1da177e4 | 1215 | #endif /* _DEVICE_H_ */ |