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989d42e8 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * device.h - generic, centralized driver model | |
4 | * | |
5 | * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> | |
b4028437 GKH |
6 | * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> |
7 | * Copyright (c) 2008-2009 Novell Inc. | |
1da177e4 | 8 | * |
fe34c89d | 9 | * See Documentation/driver-api/driver-model/ for more information. |
1da177e4 LT |
10 | */ |
11 | ||
12 | #ifndef _DEVICE_H_ | |
13 | #define _DEVICE_H_ | |
14 | ||
af628aae | 15 | #include <linux/dev_printk.h> |
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> |
1da177e4 | 24 | #include <linux/pm.h> |
60063497 | 25 | #include <linux/atomic.h> |
3c2670e6 | 26 | #include <linux/uidgid.h> |
64c862a8 | 27 | #include <linux/gfp.h> |
2509b561 | 28 | #include <linux/overflow.h> |
5aee2bf2 | 29 | #include <linux/device/bus.h> |
a8ae6085 | 30 | #include <linux/device/class.h> |
4c002c97 | 31 | #include <linux/device/driver.h> |
c6dbaef2 | 32 | #include <asm/device.h> |
1da177e4 | 33 | |
1da177e4 | 34 | struct device; |
fb069a5d | 35 | struct device_private; |
1da177e4 | 36 | struct device_driver; |
e5dd1278 | 37 | struct driver_private; |
de477254 | 38 | struct module; |
1da177e4 | 39 | struct class; |
6b6e39a6 | 40 | struct subsys_private; |
d706c1b0 | 41 | struct device_node; |
ce793486 | 42 | struct fwnode_handle; |
ff21776d | 43 | struct iommu_ops; |
74416e1e | 44 | struct iommu_group; |
23c35f48 | 45 | struct dev_pin_info; |
045a7042 | 46 | struct dev_iommu; |
b8c5cec2 | 47 | |
ca22e56d KS |
48 | /** |
49 | * struct subsys_interface - interfaces to device functions | |
2eda013f RD |
50 | * @name: name of the device function |
51 | * @subsys: subsytem of the devices to attach to | |
52 | * @node: the list of functions registered at the subsystem | |
53 | * @add_dev: device hookup to device function handler | |
54 | * @remove_dev: device hookup to device function handler | |
ca22e56d KS |
55 | * |
56 | * Simple interfaces attached to a subsystem. Multiple interfaces can | |
57 | * attach to a subsystem and its devices. Unlike drivers, they do not | |
58 | * exclusively claim or control devices. Interfaces usually represent | |
59 | * a specific functionality of a subsystem/class of devices. | |
60 | */ | |
61 | struct subsys_interface { | |
62 | const char *name; | |
63 | struct bus_type *subsys; | |
64 | struct list_head node; | |
65 | int (*add_dev)(struct device *dev, struct subsys_interface *sif); | |
71db87ba | 66 | void (*remove_dev)(struct device *dev, struct subsys_interface *sif); |
ca22e56d KS |
67 | }; |
68 | ||
69 | int subsys_interface_register(struct subsys_interface *sif); | |
70 | void subsys_interface_unregister(struct subsys_interface *sif); | |
71 | ||
72 | int subsys_system_register(struct bus_type *subsys, | |
73 | const struct attribute_group **groups); | |
d73ce004 TH |
74 | int subsys_virtual_register(struct bus_type *subsys, |
75 | const struct attribute_group **groups); | |
ca22e56d | 76 | |
414264f9 KS |
77 | /* |
78 | * The type of device, "struct device" is embedded in. A class | |
79 | * or bus can contain devices of different types | |
80 | * like "partitions" and "disks", "mouse" and "event". | |
81 | * This identifies the device type and carries type-specific | |
82 | * information, equivalent to the kobj_type of a kobject. | |
83 | * If "name" is specified, the uevent will contain it in | |
84 | * the DEVTYPE variable. | |
85 | */ | |
f9f852df | 86 | struct device_type { |
414264f9 | 87 | const char *name; |
a4dbd674 | 88 | const struct attribute_group **groups; |
7eff2e7a | 89 | int (*uevent)(struct device *dev, struct kobj_uevent_env *env); |
3c2670e6 | 90 | char *(*devnode)(struct device *dev, umode_t *mode, |
4e4098a3 | 91 | kuid_t *uid, kgid_t *gid); |
f9f852df | 92 | void (*release)(struct device *dev); |
1eede070 | 93 | |
8150f32b | 94 | const struct dev_pm_ops *pm; |
f9f852df KS |
95 | }; |
96 | ||
a7fd6706 KS |
97 | /* interface for exporting device attributes */ |
98 | struct device_attribute { | |
99 | struct attribute attr; | |
100 | ssize_t (*show)(struct device *dev, struct device_attribute *attr, | |
101 | char *buf); | |
102 | ssize_t (*store)(struct device *dev, struct device_attribute *attr, | |
103 | const char *buf, size_t count); | |
104 | }; | |
105 | ||
ca22e56d KS |
106 | struct dev_ext_attribute { |
107 | struct device_attribute attr; | |
108 | void *var; | |
109 | }; | |
110 | ||
111 | ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr, | |
112 | char *buf); | |
113 | ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr, | |
114 | const char *buf, size_t count); | |
115 | ssize_t device_show_int(struct device *dev, struct device_attribute *attr, | |
116 | char *buf); | |
117 | ssize_t device_store_int(struct device *dev, struct device_attribute *attr, | |
118 | const char *buf, size_t count); | |
91872392 BP |
119 | ssize_t device_show_bool(struct device *dev, struct device_attribute *attr, |
120 | char *buf); | |
121 | ssize_t device_store_bool(struct device *dev, struct device_attribute *attr, | |
122 | const char *buf, size_t count); | |
a7fd6706 | 123 | |
d462943a | 124 | #define DEVICE_ATTR(_name, _mode, _show, _store) \ |
ca22e56d | 125 | struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store) |
7fda9100 CL |
126 | #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \ |
127 | struct device_attribute dev_attr_##_name = \ | |
128 | __ATTR_PREALLOC(_name, _mode, _show, _store) | |
ced321bf GKH |
129 | #define DEVICE_ATTR_RW(_name) \ |
130 | struct device_attribute dev_attr_##_name = __ATTR_RW(_name) | |
131 | #define DEVICE_ATTR_RO(_name) \ | |
132 | struct device_attribute dev_attr_##_name = __ATTR_RO(_name) | |
1130c55c GKH |
133 | #define DEVICE_ATTR_WO(_name) \ |
134 | struct device_attribute dev_attr_##_name = __ATTR_WO(_name) | |
ca22e56d KS |
135 | #define DEVICE_ULONG_ATTR(_name, _mode, _var) \ |
136 | struct dev_ext_attribute dev_attr_##_name = \ | |
137 | { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) } | |
138 | #define DEVICE_INT_ATTR(_name, _mode, _var) \ | |
139 | struct dev_ext_attribute dev_attr_##_name = \ | |
94758185 | 140 | { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) } |
91872392 BP |
141 | #define DEVICE_BOOL_ATTR(_name, _mode, _var) \ |
142 | struct dev_ext_attribute dev_attr_##_name = \ | |
143 | { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) } | |
356c05d5 AS |
144 | #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \ |
145 | struct device_attribute dev_attr_##_name = \ | |
146 | __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) | |
a7fd6706 | 147 | |
b9d4e714 GKH |
148 | extern int device_create_file(struct device *device, |
149 | const struct device_attribute *entry); | |
d462943a | 150 | extern void device_remove_file(struct device *dev, |
26579ab7 | 151 | const struct device_attribute *attr); |
6b0afc2a TH |
152 | extern bool device_remove_file_self(struct device *dev, |
153 | const struct device_attribute *attr); | |
2589f188 | 154 | extern int __must_check device_create_bin_file(struct device *dev, |
66ecb92b | 155 | const struct bin_attribute *attr); |
2589f188 | 156 | extern void device_remove_bin_file(struct device *dev, |
66ecb92b | 157 | const struct bin_attribute *attr); |
9ac7849e TH |
158 | |
159 | /* device resource management */ | |
160 | typedef void (*dr_release_t)(struct device *dev, void *res); | |
161 | typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data); | |
162 | ||
163 | #ifdef CONFIG_DEBUG_DEVRES | |
7c683941 | 164 | extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp, |
48a27055 | 165 | int nid, const char *name) __malloc; |
9ac7849e | 166 | #define devres_alloc(release, size, gfp) \ |
7c683941 DW |
167 | __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release) |
168 | #define devres_alloc_node(release, size, gfp, nid) \ | |
169 | __devres_alloc_node(release, size, gfp, nid, #release) | |
9ac7849e | 170 | #else |
7c683941 | 171 | extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp, |
48a27055 | 172 | int nid) __malloc; |
7c683941 DW |
173 | static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp) |
174 | { | |
175 | return devres_alloc_node(release, size, gfp, NUMA_NO_NODE); | |
176 | } | |
9ac7849e | 177 | #endif |
7c683941 | 178 | |
bddb1b90 ML |
179 | extern void devres_for_each_res(struct device *dev, dr_release_t release, |
180 | dr_match_t match, void *match_data, | |
181 | void (*fn)(struct device *, void *, void *), | |
182 | void *data); | |
9ac7849e TH |
183 | extern void devres_free(void *res); |
184 | extern void devres_add(struct device *dev, void *res); | |
d462943a | 185 | extern void *devres_find(struct device *dev, dr_release_t release, |
9ac7849e | 186 | dr_match_t match, void *match_data); |
d462943a GKH |
187 | extern void *devres_get(struct device *dev, void *new_res, |
188 | dr_match_t match, void *match_data); | |
189 | extern void *devres_remove(struct device *dev, dr_release_t release, | |
190 | dr_match_t match, void *match_data); | |
9ac7849e TH |
191 | extern int devres_destroy(struct device *dev, dr_release_t release, |
192 | dr_match_t match, void *match_data); | |
d926d0e4 MB |
193 | extern int devres_release(struct device *dev, dr_release_t release, |
194 | dr_match_t match, void *match_data); | |
9ac7849e TH |
195 | |
196 | /* devres group */ | |
197 | extern void * __must_check devres_open_group(struct device *dev, void *id, | |
198 | gfp_t gfp); | |
199 | extern void devres_close_group(struct device *dev, void *id); | |
200 | extern void devres_remove_group(struct device *dev, void *id); | |
201 | extern int devres_release_group(struct device *dev, void *id); | |
202 | ||
64c862a8 | 203 | /* managed devm_k.alloc/kfree for device drivers */ |
48a27055 | 204 | extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc; |
8db14860 NI |
205 | extern __printf(3, 0) |
206 | char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt, | |
48a27055 | 207 | va_list ap) __malloc; |
bef59c50 | 208 | extern __printf(3, 4) |
48a27055 | 209 | char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc; |
64c862a8 JP |
210 | static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp) |
211 | { | |
212 | return devm_kmalloc(dev, size, gfp | __GFP_ZERO); | |
213 | } | |
214 | static inline void *devm_kmalloc_array(struct device *dev, | |
215 | size_t n, size_t size, gfp_t flags) | |
216 | { | |
2509b561 KC |
217 | size_t bytes; |
218 | ||
219 | if (unlikely(check_mul_overflow(n, size, &bytes))) | |
64c862a8 | 220 | return NULL; |
2509b561 KC |
221 | |
222 | return devm_kmalloc(dev, bytes, flags); | |
64c862a8 JP |
223 | } |
224 | static inline void *devm_kcalloc(struct device *dev, | |
225 | size_t n, size_t size, gfp_t flags) | |
226 | { | |
227 | return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO); | |
228 | } | |
0571967d | 229 | extern void devm_kfree(struct device *dev, const void *p); |
48a27055 | 230 | extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc; |
09d1ea1c BG |
231 | extern const char *devm_kstrdup_const(struct device *dev, |
232 | const char *s, gfp_t gfp); | |
3046365b SP |
233 | extern void *devm_kmemdup(struct device *dev, const void *src, size_t len, |
234 | gfp_t gfp); | |
9ac7849e | 235 | |
43339bed EB |
236 | extern unsigned long devm_get_free_pages(struct device *dev, |
237 | gfp_t gfp_mask, unsigned int order); | |
238 | extern void devm_free_pages(struct device *dev, unsigned long addr); | |
9ac7849e | 239 | |
eef778c9 AB |
240 | void __iomem *devm_ioremap_resource(struct device *dev, |
241 | const struct resource *res); | |
b873af62 BG |
242 | void __iomem *devm_ioremap_resource_wc(struct device *dev, |
243 | const struct resource *res); | |
72f8c0bf | 244 | |
d5e83827 BH |
245 | void __iomem *devm_of_iomap(struct device *dev, |
246 | struct device_node *node, int index, | |
247 | resource_size_t *size); | |
248 | ||
d6b0c580 DT |
249 | /* allows to add/remove a custom action to devres stack */ |
250 | int devm_add_action(struct device *dev, void (*action)(void *), void *data); | |
251 | void devm_remove_action(struct device *dev, void (*action)(void *), void *data); | |
2374b682 | 252 | void devm_release_action(struct device *dev, void (*action)(void *), void *data); |
d6b0c580 | 253 | |
a3499e9b SM |
254 | static inline int devm_add_action_or_reset(struct device *dev, |
255 | void (*action)(void *), void *data) | |
256 | { | |
257 | int ret; | |
258 | ||
259 | ret = devm_add_action(dev, action, data); | |
260 | if (ret) | |
261 | action(data); | |
262 | ||
263 | return ret; | |
264 | } | |
265 | ||
ff86aae3 MB |
266 | /** |
267 | * devm_alloc_percpu - Resource-managed alloc_percpu | |
268 | * @dev: Device to allocate per-cpu memory for | |
269 | * @type: Type to allocate per-cpu memory for | |
270 | * | |
271 | * Managed alloc_percpu. Per-cpu memory allocated with this function is | |
272 | * automatically freed on driver detach. | |
273 | * | |
274 | * RETURNS: | |
275 | * Pointer to allocated memory on success, NULL on failure. | |
276 | */ | |
277 | #define devm_alloc_percpu(dev, type) \ | |
278 | ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \ | |
279 | __alignof__(type))) | |
280 | ||
281 | void __percpu *__devm_alloc_percpu(struct device *dev, size_t size, | |
282 | size_t align); | |
283 | void devm_free_percpu(struct device *dev, void __percpu *pdata); | |
284 | ||
6b7b6510 FT |
285 | struct device_dma_parameters { |
286 | /* | |
287 | * a low level driver may set these to teach IOMMU code about | |
288 | * sg limitations. | |
289 | */ | |
290 | unsigned int max_segment_size; | |
291 | unsigned long segment_boundary_mask; | |
292 | }; | |
293 | ||
f2d9b66d HK |
294 | /** |
295 | * struct device_connection - Device Connection Descriptor | |
09aa11cf | 296 | * @fwnode: The device node of the connected device |
f2d9b66d HK |
297 | * @endpoint: The names of the two devices connected together |
298 | * @id: Unique identifier for the connection | |
299 | * @list: List head, private, for internal use only | |
09aa11cf HK |
300 | * |
301 | * NOTE: @fwnode is not used together with @endpoint. @fwnode is used when | |
302 | * platform firmware defines the connection. When the connection is registered | |
303 | * with device_connection_add() @endpoint is used instead. | |
f2d9b66d HK |
304 | */ |
305 | struct device_connection { | |
09aa11cf | 306 | struct fwnode_handle *fwnode; |
f2d9b66d HK |
307 | const char *endpoint[2]; |
308 | const char *id; | |
309 | struct list_head list; | |
310 | }; | |
311 | ||
44493062 HK |
312 | typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep, |
313 | void *data); | |
314 | ||
315 | void *fwnode_connection_find_match(struct fwnode_handle *fwnode, | |
316 | const char *con_id, void *data, | |
317 | devcon_match_fn_t match); | |
f2d9b66d | 318 | void *device_connection_find_match(struct device *dev, const char *con_id, |
44493062 | 319 | void *data, devcon_match_fn_t match); |
f2d9b66d HK |
320 | |
321 | struct device *device_connection_find(struct device *dev, const char *con_id); | |
322 | ||
323 | void device_connection_add(struct device_connection *con); | |
324 | void device_connection_remove(struct device_connection *con); | |
325 | ||
cd7753d3 HK |
326 | /** |
327 | * device_connections_add - Add multiple device connections at once | |
328 | * @cons: Zero terminated array of device connection descriptors | |
329 | */ | |
330 | static inline void device_connections_add(struct device_connection *cons) | |
331 | { | |
332 | struct device_connection *c; | |
333 | ||
334 | for (c = cons; c->endpoint[0]; c++) | |
335 | device_connection_add(c); | |
336 | } | |
337 | ||
338 | /** | |
339 | * device_connections_remove - Remove multiple device connections at once | |
340 | * @cons: Zero terminated array of device connection descriptors | |
341 | */ | |
342 | static inline void device_connections_remove(struct device_connection *cons) | |
343 | { | |
344 | struct device_connection *c; | |
345 | ||
346 | for (c = cons; c->endpoint[0]; c++) | |
347 | device_connection_remove(c); | |
348 | } | |
349 | ||
9ed98953 RW |
350 | /** |
351 | * enum device_link_state - Device link states. | |
352 | * @DL_STATE_NONE: The presence of the drivers is not being tracked. | |
353 | * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present. | |
354 | * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not. | |
355 | * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present). | |
356 | * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present. | |
357 | * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding. | |
358 | */ | |
359 | enum device_link_state { | |
360 | DL_STATE_NONE = -1, | |
361 | DL_STATE_DORMANT = 0, | |
362 | DL_STATE_AVAILABLE, | |
363 | DL_STATE_CONSUMER_PROBE, | |
364 | DL_STATE_ACTIVE, | |
365 | DL_STATE_SUPPLIER_UNBIND, | |
366 | }; | |
367 | ||
368 | /* | |
369 | * Device link flags. | |
370 | * | |
515db266 | 371 | * STATELESS: The core will not remove this link automatically. |
e88728f4 | 372 | * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind. |
21d5c57b RW |
373 | * PM_RUNTIME: If set, the runtime PM framework will use this link. |
374 | * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation. | |
1689cac5 | 375 | * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind. |
e7dd4010 | 376 | * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds. |
515db266 | 377 | * MANAGED: The core tracks presence of supplier/consumer drivers (internal). |
05ef983e | 378 | * SYNC_STATE_ONLY: Link only affects sync_state() behavior. |
9ed98953 | 379 | */ |
e88728f4 VG |
380 | #define DL_FLAG_STATELESS BIT(0) |
381 | #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1) | |
382 | #define DL_FLAG_PM_RUNTIME BIT(2) | |
383 | #define DL_FLAG_RPM_ACTIVE BIT(3) | |
1689cac5 | 384 | #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4) |
e7dd4010 | 385 | #define DL_FLAG_AUTOPROBE_CONSUMER BIT(5) |
515db266 | 386 | #define DL_FLAG_MANAGED BIT(6) |
05ef983e | 387 | #define DL_FLAG_SYNC_STATE_ONLY BIT(7) |
9ed98953 RW |
388 | |
389 | /** | |
390 | * struct device_link - Device link representation. | |
391 | * @supplier: The device on the supplier end of the link. | |
392 | * @s_node: Hook to the supplier device's list of links to consumers. | |
393 | * @consumer: The device on the consumer end of the link. | |
394 | * @c_node: Hook to the consumer device's list of links to suppliers. | |
395 | * @status: The state of the link (with respect to the presence of drivers). | |
396 | * @flags: Link flags. | |
21d5c57b | 397 | * @rpm_active: Whether or not the consumer device is runtime-PM-active. |
ead18c23 | 398 | * @kref: Count repeated addition of the same link. |
9ed98953 | 399 | * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks. |
a7013ba5 | 400 | * @supplier_preactivated: Supplier has been made active before consumer probe. |
9ed98953 RW |
401 | */ |
402 | struct device_link { | |
403 | struct device *supplier; | |
404 | struct list_head s_node; | |
405 | struct device *consumer; | |
406 | struct list_head c_node; | |
407 | enum device_link_state status; | |
408 | u32 flags; | |
e2f3cd83 | 409 | refcount_t rpm_active; |
ead18c23 | 410 | struct kref kref; |
9ed98953 RW |
411 | #ifdef CONFIG_SRCU |
412 | struct rcu_head rcu_head; | |
413 | #endif | |
36003d4c | 414 | bool supplier_preactivated; /* Owned by consumer probe. */ |
9ed98953 RW |
415 | }; |
416 | ||
417 | /** | |
418 | * enum dl_dev_state - Device driver presence tracking information. | |
419 | * @DL_DEV_NO_DRIVER: There is no driver attached to the device. | |
420 | * @DL_DEV_PROBING: A driver is probing. | |
421 | * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device. | |
422 | * @DL_DEV_UNBINDING: The driver is unbinding from the device. | |
423 | */ | |
424 | enum dl_dev_state { | |
425 | DL_DEV_NO_DRIVER = 0, | |
426 | DL_DEV_PROBING, | |
427 | DL_DEV_DRIVER_BOUND, | |
428 | DL_DEV_UNBINDING, | |
429 | }; | |
430 | ||
431 | /** | |
432 | * struct dev_links_info - Device data related to device links. | |
433 | * @suppliers: List of links to supplier devices. | |
434 | * @consumers: List of links to consumer devices. | |
e2ae9bcc | 435 | * @needs_suppliers: Hook to global list of devices waiting for suppliers. |
fc5a251d | 436 | * @defer_sync: Hook to global list of devices that have deferred sync_state. |
bcbbcfd5 SK |
437 | * @need_for_probe: If needs_suppliers is on a list, this indicates if the |
438 | * suppliers are needed for probe or not. | |
9ed98953 RW |
439 | * @status: Driver status information. |
440 | */ | |
441 | struct dev_links_info { | |
442 | struct list_head suppliers; | |
443 | struct list_head consumers; | |
e2ae9bcc | 444 | struct list_head needs_suppliers; |
fc5a251d | 445 | struct list_head defer_sync; |
bcbbcfd5 | 446 | bool need_for_probe; |
9ed98953 RW |
447 | enum dl_dev_state status; |
448 | }; | |
449 | ||
880ffb5c WG |
450 | /** |
451 | * struct device - The basic device structure | |
452 | * @parent: The device's "parent" device, the device to which it is attached. | |
453 | * In most cases, a parent device is some sort of bus or host | |
454 | * controller. If parent is NULL, the device, is a top-level device, | |
455 | * which is not usually what you want. | |
456 | * @p: Holds the private data of the driver core portions of the device. | |
457 | * See the comment of the struct device_private for detail. | |
458 | * @kobj: A top-level, abstract class from which other classes are derived. | |
459 | * @init_name: Initial name of the device. | |
460 | * @type: The type of device. | |
461 | * This identifies the device type and carries type-specific | |
462 | * information. | |
463 | * @mutex: Mutex to synchronize calls to its driver. | |
87a30e1f DW |
464 | * @lockdep_mutex: An optional debug lock that a subsystem can use as a |
465 | * peer lock to gain localized lockdep coverage of the device_lock. | |
880ffb5c WG |
466 | * @bus: Type of bus device is on. |
467 | * @driver: Which driver has allocated this | |
468 | * @platform_data: Platform data specific to the device. | |
469 | * Example: For devices on custom boards, as typical of embedded | |
470 | * and SOC based hardware, Linux often uses platform_data to point | |
471 | * to board-specific structures describing devices and how they | |
472 | * are wired. That can include what ports are available, chip | |
473 | * variants, which GPIO pins act in what additional roles, and so | |
474 | * on. This shrinks the "Board Support Packages" (BSPs) and | |
475 | * minimizes board-specific #ifdefs in drivers. | |
1bb6c08a | 476 | * @driver_data: Private pointer for driver specific info. |
64df1148 | 477 | * @links: Links to suppliers and consumers of this device. |
880ffb5c | 478 | * @power: For device power management. |
74378c5c | 479 | * See Documentation/driver-api/pm/devices.rst for details. |
564b905a | 480 | * @pm_domain: Provide callbacks that are executed during system suspend, |
880ffb5c WG |
481 | * hibernation, system resume and during runtime PM transitions |
482 | * along with subsystem-level and driver-level callbacks. | |
ab78029e | 483 | * @pins: For device pin management. |
0cca6c89 | 484 | * See Documentation/driver-api/pinctl.rst for details. |
4a7cc831 | 485 | * @msi_list: Hosts MSI descriptors |
f1421db8 | 486 | * @msi_domain: The generic MSI domain this device is using. |
880ffb5c | 487 | * @numa_node: NUMA node this device is close to. |
6a7a8176 | 488 | * @dma_ops: DMA mapping operations for this device. |
880ffb5c WG |
489 | * @dma_mask: Dma mask (if dma'ble device). |
490 | * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all | |
491 | * hardware supports 64-bit addresses for consistent allocations | |
492 | * such descriptors. | |
a7ba70f1 NSJ |
493 | * @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller |
494 | * DMA limit than the device itself supports. | |
8febcaa2 | 495 | * @dma_pfn_offset: offset of DMA memory range relatively of RAM |
880ffb5c WG |
496 | * @dma_parms: A low level driver may set these to teach IOMMU code about |
497 | * segment limitations. | |
498 | * @dma_pools: Dma pools (if dma'ble device). | |
499 | * @dma_mem: Internal for coherent mem override. | |
bfd63cd2 | 500 | * @cma_area: Contiguous memory area for dma allocations |
880ffb5c WG |
501 | * @archdata: For arch-specific additions. |
502 | * @of_node: Associated device tree node. | |
ce793486 | 503 | * @fwnode: Associated device node supplied by platform firmware. |
880ffb5c | 504 | * @devt: For creating the sysfs "dev". |
2eda013f | 505 | * @id: device instance |
880ffb5c WG |
506 | * @devres_lock: Spinlock to protect the resource of the device. |
507 | * @devres_head: The resources list of the device. | |
508 | * @knode_class: The node used to add the device to the class list. | |
509 | * @class: The class of the device. | |
510 | * @groups: Optional attribute groups. | |
511 | * @release: Callback to free the device after all references have | |
512 | * gone away. This should be set by the allocator of the | |
513 | * device (i.e. the bus driver that discovered the device). | |
bfd63cd2 | 514 | * @iommu_group: IOMMU group the device belongs to. |
045a7042 | 515 | * @iommu: Per device generic IOMMU runtime data |
880ffb5c | 516 | * |
4f3549d7 RW |
517 | * @offline_disabled: If set, the device is permanently online. |
518 | * @offline: Set after successful invocation of bus type's .offline(). | |
4e75e1d7 JH |
519 | * @of_node_reused: Set if the device-tree node is shared with an ancestor |
520 | * device. | |
fc5a251d SK |
521 | * @state_synced: The hardware state of this device has been synced to match |
522 | * the software state of this device by calling the driver/bus | |
523 | * sync_state() callback. | |
f3ecc0ff CH |
524 | * @dma_coherent: this particular device is dma coherent, even if the |
525 | * architecture supports non-coherent devices. | |
880ffb5c WG |
526 | * |
527 | * At the lowest level, every device in a Linux system is represented by an | |
528 | * instance of struct device. The device structure contains the information | |
529 | * that the device model core needs to model the system. Most subsystems, | |
530 | * however, track additional information about the devices they host. As a | |
531 | * result, it is rare for devices to be represented by bare device structures; | |
532 | * instead, that structure, like kobject structures, is usually embedded within | |
533 | * a higher-level representation of the device. | |
534 | */ | |
1da177e4 | 535 | struct device { |
159ef31e | 536 | struct kobject kobj; |
49a4ec18 | 537 | struct device *parent; |
1da177e4 | 538 | |
fb069a5d GKH |
539 | struct device_private *p; |
540 | ||
c906a48a | 541 | const char *init_name; /* initial name of the device */ |
aed65af1 | 542 | const struct device_type *type; |
1da177e4 | 543 | |
d462943a | 544 | struct bus_type *bus; /* type of bus device is on */ |
1da177e4 LT |
545 | struct device_driver *driver; /* which driver has allocated this |
546 | device */ | |
e67c8562 GKH |
547 | void *platform_data; /* Platform specific data, device |
548 | core doesn't touch it */ | |
1bb6c08a | 549 | void *driver_data; /* Driver data, set and get with |
2c6f4fc8 | 550 | dev_set_drvdata/dev_get_drvdata */ |
87a30e1f DW |
551 | #ifdef CONFIG_PROVE_LOCKING |
552 | struct mutex lockdep_mutex; | |
553 | #endif | |
159ef31e GKH |
554 | struct mutex mutex; /* mutex to synchronize calls to |
555 | * its driver. | |
556 | */ | |
557 | ||
9ed98953 | 558 | struct dev_links_info links; |
1da177e4 | 559 | struct dev_pm_info power; |
564b905a | 560 | struct dev_pm_domain *pm_domain; |
1da177e4 | 561 | |
f1421db8 MZ |
562 | #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN |
563 | struct irq_domain *msi_domain; | |
564 | #endif | |
ab78029e LW |
565 | #ifdef CONFIG_PINCTRL |
566 | struct dev_pin_info *pins; | |
567 | #endif | |
4a7cc831 JL |
568 | #ifdef CONFIG_GENERIC_MSI_IRQ |
569 | struct list_head msi_list; | |
570 | #endif | |
ab78029e | 571 | |
5657933d | 572 | const struct dma_map_ops *dma_ops; |
1da177e4 LT |
573 | u64 *dma_mask; /* dma mask (if dma'able device) */ |
574 | u64 coherent_dma_mask;/* Like dma_mask, but for | |
575 | alloc_coherent mappings as | |
576 | not all hardware supports | |
577 | 64 bit addresses for consistent | |
578 | allocations such descriptors. */ | |
a7ba70f1 | 579 | u64 bus_dma_limit; /* upstream dma constraint */ |
8febcaa2 | 580 | unsigned long dma_pfn_offset; |
1da177e4 | 581 | |
6b7b6510 FT |
582 | struct device_dma_parameters *dma_parms; |
583 | ||
1da177e4 LT |
584 | struct list_head dma_pools; /* dma pools (if dma'ble) */ |
585 | ||
ff4c25f2 | 586 | #ifdef CONFIG_DMA_DECLARE_COHERENT |
1da177e4 LT |
587 | struct dma_coherent_mem *dma_mem; /* internal for coherent mem |
588 | override */ | |
2b281296 | 589 | #endif |
a2547380 | 590 | #ifdef CONFIG_DMA_CMA |
c64be2bb MS |
591 | struct cma *cma_area; /* contiguous memory area for dma |
592 | allocations */ | |
593 | #endif | |
c6dbaef2 BH |
594 | /* arch specific additions */ |
595 | struct dev_archdata archdata; | |
c9e358df GL |
596 | |
597 | struct device_node *of_node; /* associated device tree node */ | |
ce793486 | 598 | struct fwnode_handle *fwnode; /* firmware device node */ |
1da177e4 | 599 | |
159ef31e GKH |
600 | #ifdef CONFIG_NUMA |
601 | int numa_node; /* NUMA node this device is close to */ | |
602 | #endif | |
929d2fa5 | 603 | dev_t devt; /* dev_t, creates the sysfs "dev" */ |
ca22e56d | 604 | u32 id; /* device instance */ |
929d2fa5 | 605 | |
9ac7849e TH |
606 | spinlock_t devres_lock; |
607 | struct list_head devres_head; | |
608 | ||
b7a3e813 | 609 | struct class *class; |
a4dbd674 | 610 | const struct attribute_group **groups; /* optional groups */ |
23681e47 | 611 | |
d462943a | 612 | void (*release)(struct device *dev); |
74416e1e | 613 | struct iommu_group *iommu_group; |
045a7042 | 614 | struct dev_iommu *iommu; |
4f3549d7 RW |
615 | |
616 | bool offline_disabled:1; | |
617 | bool offline:1; | |
4e75e1d7 | 618 | bool of_node_reused:1; |
fc5a251d | 619 | bool state_synced:1; |
f3ecc0ff CH |
620 | #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \ |
621 | defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \ | |
622 | defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) | |
623 | bool dma_coherent:1; | |
624 | #endif | |
1da177e4 LT |
625 | }; |
626 | ||
a4232963 LPC |
627 | static inline struct device *kobj_to_dev(struct kobject *kobj) |
628 | { | |
629 | return container_of(kobj, struct device, kobj); | |
630 | } | |
631 | ||
dbba197e JR |
632 | /** |
633 | * device_iommu_mapped - Returns true when the device DMA is translated | |
634 | * by an IOMMU | |
635 | * @dev: Device to perform the check on | |
636 | */ | |
637 | static inline bool device_iommu_mapped(struct device *dev) | |
638 | { | |
639 | return (dev->iommu_group != NULL); | |
640 | } | |
641 | ||
9a3df1f7 AS |
642 | /* Get the wakeup routines, which depend on struct device */ |
643 | #include <linux/pm_wakeup.h> | |
644 | ||
bf9ca69f | 645 | static inline const char *dev_name(const struct device *dev) |
06916639 | 646 | { |
a636ee7f PM |
647 | /* Use the init name until the kobject becomes available */ |
648 | if (dev->init_name) | |
649 | return dev->init_name; | |
650 | ||
1fa5ae85 | 651 | return kobject_name(&dev->kobj); |
06916639 KS |
652 | } |
653 | ||
b9075fa9 JP |
654 | extern __printf(2, 3) |
655 | int dev_set_name(struct device *dev, const char *name, ...); | |
413c239f | 656 | |
87348136 CH |
657 | #ifdef CONFIG_NUMA |
658 | static inline int dev_to_node(struct device *dev) | |
659 | { | |
660 | return dev->numa_node; | |
661 | } | |
662 | static inline void set_dev_node(struct device *dev, int node) | |
663 | { | |
664 | dev->numa_node = node; | |
665 | } | |
666 | #else | |
667 | static inline int dev_to_node(struct device *dev) | |
668 | { | |
98fa15f3 | 669 | return NUMA_NO_NODE; |
87348136 CH |
670 | } |
671 | static inline void set_dev_node(struct device *dev, int node) | |
672 | { | |
673 | } | |
674 | #endif | |
675 | ||
f1421db8 MZ |
676 | static inline struct irq_domain *dev_get_msi_domain(const struct device *dev) |
677 | { | |
678 | #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN | |
679 | return dev->msi_domain; | |
680 | #else | |
681 | return NULL; | |
682 | #endif | |
683 | } | |
684 | ||
685 | static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d) | |
686 | { | |
687 | #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN | |
688 | dev->msi_domain = d; | |
689 | #endif | |
690 | } | |
691 | ||
a996d010 JD |
692 | static inline void *dev_get_drvdata(const struct device *dev) |
693 | { | |
694 | return dev->driver_data; | |
695 | } | |
696 | ||
697 | static inline void dev_set_drvdata(struct device *dev, void *data) | |
698 | { | |
699 | dev->driver_data = data; | |
700 | } | |
701 | ||
5c095a0e RW |
702 | static inline struct pm_subsys_data *dev_to_psd(struct device *dev) |
703 | { | |
704 | return dev ? dev->power.subsys_data : NULL; | |
705 | } | |
706 | ||
f67f129e ML |
707 | static inline unsigned int dev_get_uevent_suppress(const struct device *dev) |
708 | { | |
709 | return dev->kobj.uevent_suppress; | |
710 | } | |
711 | ||
712 | static inline void dev_set_uevent_suppress(struct device *dev, int val) | |
713 | { | |
714 | dev->kobj.uevent_suppress = val; | |
715 | } | |
716 | ||
d305ef5d DR |
717 | static inline int device_is_registered(struct device *dev) |
718 | { | |
3f62e570 | 719 | return dev->kobj.state_in_sysfs; |
d305ef5d DR |
720 | } |
721 | ||
5af84b82 RW |
722 | static inline void device_enable_async_suspend(struct device *dev) |
723 | { | |
f76b168b | 724 | if (!dev->power.is_prepared) |
5af84b82 RW |
725 | dev->power.async_suspend = true; |
726 | } | |
727 | ||
5a2eb858 RW |
728 | static inline void device_disable_async_suspend(struct device *dev) |
729 | { | |
f76b168b | 730 | if (!dev->power.is_prepared) |
5a2eb858 RW |
731 | dev->power.async_suspend = false; |
732 | } | |
733 | ||
734 | static inline bool device_async_suspend_enabled(struct device *dev) | |
735 | { | |
736 | return !!dev->power.async_suspend; | |
737 | } | |
738 | ||
85945c28 SH |
739 | static inline bool device_pm_not_required(struct device *dev) |
740 | { | |
741 | return dev->power.no_pm; | |
742 | } | |
743 | ||
744 | static inline void device_set_pm_not_required(struct device *dev) | |
745 | { | |
746 | dev->power.no_pm = true; | |
747 | } | |
748 | ||
feb70af0 RW |
749 | static inline void dev_pm_syscore_device(struct device *dev, bool val) |
750 | { | |
751 | #ifdef CONFIG_PM_SLEEP | |
752 | dev->power.syscore = val; | |
753 | #endif | |
754 | } | |
755 | ||
08810a41 RW |
756 | static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags) |
757 | { | |
758 | dev->power.driver_flags = flags; | |
759 | } | |
760 | ||
761 | static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags) | |
762 | { | |
763 | return !!(dev->power.driver_flags & flags); | |
764 | } | |
765 | ||
8e9394ce GKH |
766 | static inline void device_lock(struct device *dev) |
767 | { | |
3142788b | 768 | mutex_lock(&dev->mutex); |
8e9394ce GKH |
769 | } |
770 | ||
7dd9cba5 ON |
771 | static inline int device_lock_interruptible(struct device *dev) |
772 | { | |
773 | return mutex_lock_interruptible(&dev->mutex); | |
774 | } | |
775 | ||
8e9394ce GKH |
776 | static inline int device_trylock(struct device *dev) |
777 | { | |
3142788b | 778 | return mutex_trylock(&dev->mutex); |
8e9394ce GKH |
779 | } |
780 | ||
781 | static inline void device_unlock(struct device *dev) | |
782 | { | |
3142788b | 783 | mutex_unlock(&dev->mutex); |
8e9394ce GKH |
784 | } |
785 | ||
ac801022 KRW |
786 | static inline void device_lock_assert(struct device *dev) |
787 | { | |
788 | lockdep_assert_held(&dev->mutex); | |
789 | } | |
790 | ||
e8a51e1b BH |
791 | static inline struct device_node *dev_of_node(struct device *dev) |
792 | { | |
1b833924 | 793 | if (!IS_ENABLED(CONFIG_OF) || !dev) |
e8a51e1b BH |
794 | return NULL; |
795 | return dev->of_node; | |
796 | } | |
797 | ||
ac338acf SK |
798 | static inline bool dev_has_sync_state(struct device *dev) |
799 | { | |
800 | if (!dev) | |
801 | return false; | |
802 | if (dev->driver && dev->driver->sync_state) | |
803 | return true; | |
804 | if (dev->bus && dev->bus->sync_state) | |
805 | return true; | |
806 | return false; | |
807 | } | |
808 | ||
1da177e4 LT |
809 | /* |
810 | * High level routines for use by the bus drivers | |
811 | */ | |
d462943a GKH |
812 | extern int __must_check device_register(struct device *dev); |
813 | extern void device_unregister(struct device *dev); | |
814 | extern void device_initialize(struct device *dev); | |
815 | extern int __must_check device_add(struct device *dev); | |
816 | extern void device_del(struct device *dev); | |
817 | extern int device_for_each_child(struct device *dev, void *data, | |
818 | int (*fn)(struct device *dev, void *data)); | |
3d060aeb AS |
819 | extern int device_for_each_child_reverse(struct device *dev, void *data, |
820 | int (*fn)(struct device *dev, void *data)); | |
d462943a GKH |
821 | extern struct device *device_find_child(struct device *dev, void *data, |
822 | int (*match)(struct device *dev, void *data)); | |
dad9bb01 HK |
823 | extern struct device *device_find_child_by_name(struct device *parent, |
824 | const char *name); | |
6937e8f8 | 825 | extern int device_rename(struct device *dev, const char *new_name); |
ffa6a705 CH |
826 | extern int device_move(struct device *dev, struct device *new_parent, |
827 | enum dpm_order dpm_order); | |
b8f33e5d | 828 | extern int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid); |
e454cea2 | 829 | extern const char *device_get_devnode(struct device *dev, |
4e4098a3 | 830 | umode_t *mode, kuid_t *uid, kgid_t *gid, |
3c2670e6 | 831 | const char **tmp); |
1da177e4 | 832 | |
4f3549d7 RW |
833 | static inline bool device_supports_offline(struct device *dev) |
834 | { | |
835 | return dev->bus && dev->bus->offline && dev->bus->online; | |
836 | } | |
837 | ||
838 | extern void lock_device_hotplug(void); | |
839 | extern void unlock_device_hotplug(void); | |
5e33bc41 | 840 | extern int lock_device_hotplug_sysfs(void); |
4f3549d7 RW |
841 | extern int device_offline(struct device *dev); |
842 | extern int device_online(struct device *dev); | |
97badf87 RW |
843 | extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode); |
844 | extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode); | |
4e75e1d7 | 845 | void device_set_of_node_from_dev(struct device *dev, const struct device *dev2); |
97badf87 | 846 | |
9af15c38 PS |
847 | static inline int dev_num_vf(struct device *dev) |
848 | { | |
849 | if (dev->bus && dev->bus->num_vf) | |
850 | return dev->bus->num_vf(dev); | |
851 | return 0; | |
852 | } | |
853 | ||
0aa0dc41 MM |
854 | /* |
855 | * Root device objects for grouping under /sys/devices | |
856 | */ | |
857 | extern struct device *__root_device_register(const char *name, | |
858 | struct module *owner); | |
eb5589a8 | 859 | |
33ac1257 | 860 | /* This is a macro to avoid include problems with THIS_MODULE */ |
eb5589a8 PG |
861 | #define root_device_register(name) \ |
862 | __root_device_register(name, THIS_MODULE) | |
863 | ||
0aa0dc41 MM |
864 | extern void root_device_unregister(struct device *root); |
865 | ||
a5b8b1ad MB |
866 | static inline void *dev_get_platdata(const struct device *dev) |
867 | { | |
868 | return dev->platform_data; | |
869 | } | |
870 | ||
1da177e4 LT |
871 | /* |
872 | * Manual binding of a device to driver. See drivers/base/bus.c | |
873 | * for information on use. | |
874 | */ | |
f86db396 | 875 | extern int __must_check device_bind_driver(struct device *dev); |
d462943a GKH |
876 | extern void device_release_driver(struct device *dev); |
877 | extern int __must_check device_attach(struct device *dev); | |
f86db396 | 878 | extern int __must_check driver_attach(struct device_driver *drv); |
765230b5 | 879 | extern void device_initial_probe(struct device *dev); |
f86db396 | 880 | extern int __must_check device_reprobe(struct device *dev); |
1da177e4 | 881 | |
6b9cb427 TV |
882 | extern bool device_is_bound(struct device *dev); |
883 | ||
23681e47 GKH |
884 | /* |
885 | * Easy functions for dynamically creating devices on the fly | |
886 | */ | |
b9075fa9 JP |
887 | extern __printf(5, 6) |
888 | struct device *device_create(struct class *cls, struct device *parent, | |
889 | dev_t devt, void *drvdata, | |
890 | const char *fmt, ...); | |
39ef3112 GR |
891 | extern __printf(6, 7) |
892 | struct device *device_create_with_groups(struct class *cls, | |
893 | struct device *parent, dev_t devt, void *drvdata, | |
894 | const struct attribute_group **groups, | |
895 | const char *fmt, ...); | |
23681e47 | 896 | extern void device_destroy(struct class *cls, dev_t devt); |
1da177e4 | 897 | |
a7670d42 DT |
898 | extern int __must_check device_add_groups(struct device *dev, |
899 | const struct attribute_group **groups); | |
900 | extern void device_remove_groups(struct device *dev, | |
901 | const struct attribute_group **groups); | |
902 | ||
e323b2dd DT |
903 | static inline int __must_check device_add_group(struct device *dev, |
904 | const struct attribute_group *grp) | |
905 | { | |
906 | const struct attribute_group *groups[] = { grp, NULL }; | |
907 | ||
908 | return device_add_groups(dev, groups); | |
909 | } | |
910 | ||
911 | static inline void device_remove_group(struct device *dev, | |
912 | const struct attribute_group *grp) | |
913 | { | |
914 | const struct attribute_group *groups[] = { grp, NULL }; | |
915 | ||
916 | return device_remove_groups(dev, groups); | |
917 | } | |
918 | ||
57b8ff07 DT |
919 | extern int __must_check devm_device_add_groups(struct device *dev, |
920 | const struct attribute_group **groups); | |
921 | extern void devm_device_remove_groups(struct device *dev, | |
922 | const struct attribute_group **groups); | |
923 | extern int __must_check devm_device_add_group(struct device *dev, | |
924 | const struct attribute_group *grp); | |
925 | extern void devm_device_remove_group(struct device *dev, | |
926 | const struct attribute_group *grp); | |
927 | ||
1da177e4 LT |
928 | /* |
929 | * Platform "fixup" functions - allow the platform to have their say | |
930 | * about devices and actions that the general device layer doesn't | |
931 | * know about. | |
932 | */ | |
933 | /* Notify platform of device discovery */ | |
d462943a | 934 | extern int (*platform_notify)(struct device *dev); |
1da177e4 | 935 | |
d462943a | 936 | extern int (*platform_notify_remove)(struct device *dev); |
1da177e4 LT |
937 | |
938 | ||
880ffb5c | 939 | /* |
1da177e4 LT |
940 | * get_device - atomically increment the reference count for the device. |
941 | * | |
942 | */ | |
d462943a GKH |
943 | extern struct device *get_device(struct device *dev); |
944 | extern void put_device(struct device *dev); | |
00289cd8 | 945 | extern bool kill_device(struct device *dev); |
1da177e4 | 946 | |
2b2af54a | 947 | #ifdef CONFIG_DEVTMPFS |
5e787dbf | 948 | extern int devtmpfs_mount(void); |
2b2af54a | 949 | #else |
5e787dbf | 950 | static inline int devtmpfs_mount(void) { return 0; } |
2b2af54a KS |
951 | #endif |
952 | ||
116f232b | 953 | /* drivers/base/power/shutdown.c */ |
1da177e4 LT |
954 | extern void device_shutdown(void); |
955 | ||
1da177e4 | 956 | /* debugging and troubleshooting/diagnostic helpers. */ |
bf9ca69f | 957 | extern const char *dev_driver_string(const struct device *dev); |
99bcf217 | 958 | |
9ed98953 RW |
959 | /* Device links interface. */ |
960 | struct device_link *device_link_add(struct device *consumer, | |
961 | struct device *supplier, u32 flags); | |
962 | void device_link_del(struct device_link *link); | |
d8842211 | 963 | void device_link_remove(void *consumer, struct device *supplier); |
fc5a251d SK |
964 | void device_links_supplier_sync_state_pause(void); |
965 | void device_links_supplier_sync_state_resume(void); | |
99bcf217 | 966 | |
1da177e4 LT |
967 | /* Create alias, so I can be autoloaded. */ |
968 | #define MODULE_ALIAS_CHARDEV(major,minor) \ | |
969 | MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor)) | |
970 | #define MODULE_ALIAS_CHARDEV_MAJOR(major) \ | |
971 | MODULE_ALIAS("char-major-" __stringify(major) "-*") | |
e52eec13 AK |
972 | |
973 | #ifdef CONFIG_SYSFS_DEPRECATED | |
974 | extern long sysfs_deprecated; | |
975 | #else | |
976 | #define sysfs_deprecated 0 | |
977 | #endif | |
978 | ||
1da177e4 | 979 | #endif /* _DEVICE_H_ */ |