1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 * Copyright (c) 2021-2022 The FreeBSD Foundation
8 *
9 * Portions of this software were developed by Björn Zeeb
10 * under sponsorship from the FreeBSD Foundation.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 * notice unmodified, this list of conditions, and the following
17 * disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33 #ifndef _LINUXKPI_LINUX_DEVICE_H_
34 #define _LINUXKPI_LINUX_DEVICE_H_
35
36 #include <linux/err.h>
37 #include <linux/types.h>
38 #include <linux/kobject.h>
39 #include <linux/sysfs.h>
40 #include <linux/list.h>
41 #include <linux/compiler.h>
42 #include <linux/module.h>
43 #include <linux/workqueue.h>
44 #include <linux/kdev_t.h>
45 #include <linux/backlight.h>
46 #include <linux/pm.h>
47 #include <linux/idr.h>
48 #include <linux/overflow.h>
49 #include <linux/ratelimit.h> /* via linux/dev_printk.h */
50 #include <linux/fwnode.h>
51 #include <asm/atomic.h>
52
53 #include <sys/bus.h>
54 #include <sys/backlight.h>
55
56 struct device;
57
58 struct class {
59 const char *name;
60 struct module *owner;
61 struct kobject kobj;
62 devclass_t bsdclass;
63 const struct dev_pm_ops *pm;
64 const struct attribute_group **dev_groups;
65 void (*class_release)(struct class *class);
66 void (*dev_release)(struct device *dev);
67 char * (*devnode)(struct device *dev, umode_t *mode);
68 };
69
70 struct dev_pm_ops {
71 int (*prepare)(struct device *dev);
72 void (*complete)(struct device *dev);
73 int (*suspend)(struct device *dev);
74 int (*suspend_late)(struct device *dev);
75 int (*resume)(struct device *dev);
76 int (*resume_early)(struct device *dev);
77 int (*freeze)(struct device *dev);
78 int (*freeze_late)(struct device *dev);
79 int (*thaw)(struct device *dev);
80 int (*thaw_early)(struct device *dev);
81 int (*poweroff)(struct device *dev);
82 int (*poweroff_late)(struct device *dev);
83 int (*restore)(struct device *dev);
84 int (*restore_early)(struct device *dev);
85 int (*suspend_noirq)(struct device *dev);
86 int (*runtime_suspend)(struct device *dev);
87 int (*runtime_resume)(struct device *dev);
88 int (*runtime_idle)(struct device *dev);
89 };
90
91 struct device_driver {
92 const char *name;
93 const struct dev_pm_ops *pm;
94 };
95
96 struct device_type {
97 const char *name;
98 };
99
100 struct device {
101 struct device *parent;
102 struct list_head irqents;
103 device_t bsddev;
104 /*
105 * The following flag is used to determine if the LinuxKPI is
106 * responsible for detaching the BSD device or not. If the
107 * LinuxKPI got the BSD device using devclass_get_device(), it
108 * must not try to detach or delete it, because it's already
109 * done somewhere else.
110 */
111 bool bsddev_attached_here;
112 struct device_driver *driver;
113 struct device_type *type;
114 dev_t devt;
115 struct class *class;
116 void (*release)(struct device *dev);
117 struct kobject kobj;
118 void *dma_priv;
119 void *driver_data;
120 unsigned int irq;
121 #define LINUX_IRQ_INVALID 65535
122 unsigned int irq_start;
123 unsigned int irq_end;
124 const struct attribute_group **groups;
125 struct fwnode_handle *fwnode;
126 struct cdev *backlight_dev;
127 struct backlight_device *bd;
128
129 spinlock_t devres_lock;
130 struct list_head devres_head;
131
132 struct dev_pm_info power;
133 };
134
135 extern struct device linux_root_device;
136 extern struct kobject linux_class_root;
137 extern const struct kobj_type linux_dev_ktype;
138 extern const struct kobj_type linux_class_ktype;
139
140 struct class_attribute {
141 struct attribute attr;
142 ssize_t (*show)(struct class *, struct class_attribute *, char *);
143 ssize_t (*store)(struct class *, struct class_attribute *, const char *, size_t);
144 const void *(*namespace)(struct class *, const struct class_attribute *);
145 };
146
147 #define CLASS_ATTR(_name, _mode, _show, _store) \
148 struct class_attribute class_attr_##_name = \
149 { { #_name, NULL, _mode }, _show, _store }
150
151 struct device_attribute {
152 struct attribute attr;
153 ssize_t (*show)(struct device *,
154 struct device_attribute *, char *);
155 ssize_t (*store)(struct device *,
156 struct device_attribute *, const char *,
157 size_t);
158 };
159
160 #define DEVICE_ATTR(_name, _mode, _show, _store) \
161 struct device_attribute dev_attr_##_name = \
162 __ATTR(_name, _mode, _show, _store)
163 #define DEVICE_ATTR_RO(_name) \
164 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
165 #define DEVICE_ATTR_WO(_name) \
166 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
167 #define DEVICE_ATTR_RW(_name) \
168 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
169
170 /* Simple class attribute that is just a static string */
171 struct class_attribute_string {
172 struct class_attribute attr;
173 char *str;
174 };
175
176 static inline ssize_t
show_class_attr_string(struct class * class,struct class_attribute * attr,char * buf)177 show_class_attr_string(struct class *class,
178 struct class_attribute *attr, char *buf)
179 {
180 struct class_attribute_string *cs;
181 cs = container_of(attr, struct class_attribute_string, attr);
182 return snprintf(buf, PAGE_SIZE, "%s\n", cs->str);
183 }
184
185 /* Currently read-only only */
186 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
187 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
188 #define CLASS_ATTR_STRING(_name, _mode, _str) \
189 struct class_attribute_string class_attr_##_name = \
190 _CLASS_ATTR_STRING(_name, _mode, _str)
191
192 #define dev_printk(lvl, dev, fmt, ...) \
193 device_printf((dev)->bsddev, fmt, ##__VA_ARGS__)
194
195 #define dev_emerg(dev, fmt, ...) device_printf((dev)->bsddev, fmt, ##__VA_ARGS__)
196 #define dev_alert(dev, fmt, ...) device_printf((dev)->bsddev, fmt, ##__VA_ARGS__)
197 #define dev_crit(dev, fmt, ...) device_printf((dev)->bsddev, fmt, ##__VA_ARGS__)
198 #define dev_err(dev, fmt, ...) device_printf((dev)->bsddev, fmt, ##__VA_ARGS__)
199 #define dev_warn(dev, fmt, ...) device_printf((dev)->bsddev, fmt, ##__VA_ARGS__)
200 #define dev_notice(dev, fmt, ...) device_printf((dev)->bsddev, fmt, ##__VA_ARGS__)
201 #define dev_info(dev, fmt, ...) device_printf((dev)->bsddev, fmt, ##__VA_ARGS__)
202 #define dev_dbg(dev, fmt, ...) do { } while (0)
203
204 #define dev_WARN(dev, fmt, ...) \
205 device_printf((dev)->bsddev, "%s:%d: " fmt, __func__, __LINE__, ##__VA_ARGS__)
206
207 #define dev_WARN_ONCE(dev, condition, fmt, ...) do { \
208 static bool __dev_WARN_ONCE; \
209 bool __ret_warn_on = (condition); \
210 if (unlikely(__ret_warn_on)) { \
211 if (!__dev_WARN_ONCE) { \
212 __dev_WARN_ONCE = true; \
213 device_printf((dev)->bsddev, "%s:%d: " fmt, __func__, __LINE__, ##__VA_ARGS__); \
214 } \
215 } \
216 } while (0)
217
218 #define dev_info_once(dev, ...) do { \
219 static bool __dev_info_once; \
220 if (!__dev_info_once) { \
221 __dev_info_once = true; \
222 dev_info(dev, __VA_ARGS__); \
223 } \
224 } while (0)
225
226 #define dev_warn_once(dev, ...) do { \
227 static bool __dev_warn_once; \
228 if (!__dev_warn_once) { \
229 __dev_warn_once = 1; \
230 dev_warn(dev, __VA_ARGS__); \
231 } \
232 } while (0)
233
234 #define dev_err_once(dev, ...) do { \
235 static bool __dev_err_once; \
236 if (!__dev_err_once) { \
237 __dev_err_once = 1; \
238 dev_err(dev, __VA_ARGS__); \
239 } \
240 } while (0)
241
242 #define dev_dbg_once(dev, ...) do { \
243 static bool __dev_dbg_once; \
244 if (!__dev_dbg_once) { \
245 __dev_dbg_once = 1; \
246 dev_dbg(dev, __VA_ARGS__); \
247 } \
248 } while (0)
249
250 #define dev_err_ratelimited(dev, ...) do { \
251 static linux_ratelimit_t __ratelimited; \
252 if (linux_ratelimited(&__ratelimited)) \
253 dev_err(dev, __VA_ARGS__); \
254 } while (0)
255
256 #define dev_warn_ratelimited(dev, ...) do { \
257 static linux_ratelimit_t __ratelimited; \
258 if (linux_ratelimited(&__ratelimited)) \
259 dev_warn(dev, __VA_ARGS__); \
260 } while (0)
261
262 #define dev_dbg_ratelimited(dev, ...) do { \
263 static linux_ratelimit_t __ratelimited; \
264 if (linux_ratelimited(&__ratelimited)) \
265 dev_dbg(dev, __VA_ARGS__); \
266 } while (0)
267
268 /* Public and LinuxKPI internal devres functions. */
269 void *lkpi_devres_alloc(void(*release)(struct device *, void *), size_t, gfp_t);
270 void lkpi_devres_add(struct device *, void *);
271 void lkpi_devres_free(void *);
272 void *lkpi_devres_find(struct device *, void(*release)(struct device *, void *),
273 int (*match)(struct device *, void *, void *), void *);
274 int lkpi_devres_destroy(struct device *, void(*release)(struct device *, void *),
275 int (*match)(struct device *, void *, void *), void *);
276 #define devres_alloc(_r, _s, _g) lkpi_devres_alloc(_r, _s, _g)
277 #define devres_add(_d, _p) lkpi_devres_add(_d, _p)
278 #define devres_free(_p) lkpi_devres_free(_p)
279 #define devres_find(_d, _rfn, _mfn, _mp) \
280 lkpi_devres_find(_d, _rfn, _mfn, _mp)
281 #define devres_destroy(_d, _rfn, _mfn, _mp) \
282 lkpi_devres_destroy(_d, _rfn, _mfn, _mp)
283 void lkpi_devres_release_free_list(struct device *);
284 void lkpi_devres_unlink(struct device *, void *);
285 void lkpi_devm_kmalloc_release(struct device *, void *);
286 #define devm_kfree(_d, _p) lkpi_devm_kmalloc_release(_d, _p)
287
288 static inline const char *
dev_driver_string(const struct device * dev)289 dev_driver_string(const struct device *dev)
290 {
291 driver_t *drv;
292 const char *str = "";
293
294 if (dev->bsddev != NULL) {
295 drv = device_get_driver(dev->bsddev);
296 if (drv != NULL)
297 str = drv->name;
298 }
299
300 return (str);
301 }
302
303 static inline void *
dev_get_drvdata(const struct device * dev)304 dev_get_drvdata(const struct device *dev)
305 {
306
307 return dev->driver_data;
308 }
309
310 static inline void
dev_set_drvdata(struct device * dev,void * data)311 dev_set_drvdata(struct device *dev, void *data)
312 {
313
314 dev->driver_data = data;
315 }
316
317 static inline struct device *
get_device(struct device * dev)318 get_device(struct device *dev)
319 {
320
321 if (dev)
322 kobject_get(&dev->kobj);
323
324 return (dev);
325 }
326
327 static inline char *
dev_name(const struct device * dev)328 dev_name(const struct device *dev)
329 {
330
331 return kobject_name(&dev->kobj);
332 }
333
334 #define dev_set_name(_dev, _fmt, ...) \
335 kobject_set_name(&(_dev)->kobj, (_fmt), ##__VA_ARGS__)
336
337 static inline void
put_device(struct device * dev)338 put_device(struct device *dev)
339 {
340
341 if (dev)
342 kobject_put(&dev->kobj);
343 }
344
345 struct class *class_create(struct module *owner, const char *name);
346
347 static inline int
class_register(struct class * class)348 class_register(struct class *class)
349 {
350
351 class->bsdclass = devclass_create(class->name);
352 kobject_init(&class->kobj, &linux_class_ktype);
353 kobject_set_name(&class->kobj, class->name);
354 kobject_add(&class->kobj, &linux_class_root, class->name);
355
356 return (0);
357 }
358
359 static inline void
class_unregister(struct class * class)360 class_unregister(struct class *class)
361 {
362
363 kobject_put(&class->kobj);
364 }
365
kobj_to_dev(struct kobject * kobj)366 static inline struct device *kobj_to_dev(struct kobject *kobj)
367 {
368 return container_of(kobj, struct device, kobj);
369 }
370
371 struct device *device_create(struct class *class, struct device *parent,
372 dev_t devt, void *drvdata, const char *fmt, ...);
373 struct device *device_create_groups_vargs(struct class *class, struct device *parent,
374 dev_t devt, void *drvdata, const struct attribute_group **groups,
375 const char *fmt, va_list args);
376
377 /*
378 * Devices are registered and created for exporting to sysfs. Create
379 * implies register and register assumes the device fields have been
380 * setup appropriately before being called.
381 */
382 static inline void
device_initialize(struct device * dev)383 device_initialize(struct device *dev)
384 {
385 device_t bsddev = NULL;
386 int unit = -1;
387
388 if (dev->devt) {
389 unit = MINOR(dev->devt);
390 bsddev = devclass_get_device(dev->class->bsdclass, unit);
391 dev->bsddev_attached_here = false;
392 } else if (dev->parent == NULL) {
393 bsddev = devclass_get_device(dev->class->bsdclass, 0);
394 dev->bsddev_attached_here = false;
395 } else {
396 dev->bsddev_attached_here = true;
397 }
398
399 if (bsddev == NULL && dev->parent != NULL) {
400 bsddev = device_add_child(dev->parent->bsddev,
401 dev->class->kobj.name, unit);
402 }
403
404 if (bsddev != NULL)
405 device_set_softc(bsddev, dev);
406
407 dev->bsddev = bsddev;
408 MPASS(dev->bsddev != NULL);
409 kobject_init(&dev->kobj, &linux_dev_ktype);
410
411 spin_lock_init(&dev->devres_lock);
412 INIT_LIST_HEAD(&dev->devres_head);
413 }
414
415 static inline int
device_add(struct device * dev)416 device_add(struct device *dev)
417 {
418 if (dev->bsddev != NULL) {
419 if (dev->devt == 0)
420 dev->devt = makedev(0, device_get_unit(dev->bsddev));
421 }
422 kobject_add(&dev->kobj, &dev->class->kobj, dev_name(dev));
423
424 if (dev->groups)
425 return (sysfs_create_groups(&dev->kobj, dev->groups));
426
427 return (0);
428 }
429
430 static inline void
device_create_release(struct device * dev)431 device_create_release(struct device *dev)
432 {
433 kfree(dev);
434 }
435
436 static inline struct device *
device_create_with_groups(struct class * class,struct device * parent,dev_t devt,void * drvdata,const struct attribute_group ** groups,const char * fmt,...)437 device_create_with_groups(struct class *class,
438 struct device *parent, dev_t devt, void *drvdata,
439 const struct attribute_group **groups, const char *fmt, ...)
440 {
441 va_list vargs;
442 struct device *dev;
443
444 va_start(vargs, fmt);
445 dev = device_create_groups_vargs(class, parent, devt, drvdata,
446 groups, fmt, vargs);
447 va_end(vargs);
448 return dev;
449 }
450
451 static inline bool
device_is_registered(struct device * dev)452 device_is_registered(struct device *dev)
453 {
454
455 return (dev->bsddev != NULL);
456 }
457
458 static inline int
device_register(struct device * dev)459 device_register(struct device *dev)
460 {
461 device_t bsddev = NULL;
462 int unit = -1;
463
464 if (device_is_registered(dev))
465 goto done;
466
467 if (dev->devt) {
468 unit = MINOR(dev->devt);
469 bsddev = devclass_get_device(dev->class->bsdclass, unit);
470 dev->bsddev_attached_here = false;
471 } else if (dev->parent == NULL) {
472 bsddev = devclass_get_device(dev->class->bsdclass, 0);
473 dev->bsddev_attached_here = false;
474 } else {
475 dev->bsddev_attached_here = true;
476 }
477 if (bsddev == NULL && dev->parent != NULL) {
478 bsddev = device_add_child(dev->parent->bsddev,
479 dev->class->kobj.name, unit);
480 }
481 if (bsddev != NULL) {
482 if (dev->devt == 0)
483 dev->devt = makedev(0, device_get_unit(bsddev));
484 device_set_softc(bsddev, dev);
485 }
486 dev->bsddev = bsddev;
487 done:
488 kobject_init(&dev->kobj, &linux_dev_ktype);
489 kobject_add(&dev->kobj, &dev->class->kobj, dev_name(dev));
490
491 sysfs_create_groups(&dev->kobj, dev->class->dev_groups);
492
493 return (0);
494 }
495
496 static inline void
device_unregister(struct device * dev)497 device_unregister(struct device *dev)
498 {
499 device_t bsddev;
500
501 sysfs_remove_groups(&dev->kobj, dev->class->dev_groups);
502
503 bsddev = dev->bsddev;
504 dev->bsddev = NULL;
505
506 if (bsddev != NULL && dev->bsddev_attached_here) {
507 bus_topo_lock();
508 device_delete_child(device_get_parent(bsddev), bsddev);
509 bus_topo_unlock();
510 }
511 put_device(dev);
512 }
513
514 static inline void
device_del(struct device * dev)515 device_del(struct device *dev)
516 {
517 device_t bsddev;
518
519 bsddev = dev->bsddev;
520 dev->bsddev = NULL;
521
522 if (bsddev != NULL && dev->bsddev_attached_here) {
523 bus_topo_lock();
524 device_delete_child(device_get_parent(bsddev), bsddev);
525 bus_topo_unlock();
526 }
527 }
528
529 static inline void
device_destroy(struct class * class,dev_t devt)530 device_destroy(struct class *class, dev_t devt)
531 {
532 device_t bsddev;
533 int unit;
534
535 unit = MINOR(devt);
536 bsddev = devclass_get_device(class->bsdclass, unit);
537 if (bsddev != NULL)
538 device_unregister(device_get_softc(bsddev));
539 }
540
541 static inline void
device_release_driver(struct device * dev)542 device_release_driver(struct device *dev)
543 {
544
545 #if 0
546 /* This leads to panics. Disable temporarily. Keep to rework. */
547
548 /* We also need to cleanup LinuxKPI bits. What else? */
549 lkpi_devres_release_free_list(dev);
550 dev_set_drvdata(dev, NULL);
551 /* Do not call dev->release! */
552
553 bus_topo_lock();
554 if (device_is_attached(dev->bsddev))
555 device_detach(dev->bsddev);
556 bus_topo_unlock();
557 #endif
558 }
559
560 static inline int
device_reprobe(struct device * dev)561 device_reprobe(struct device *dev)
562 {
563 int error;
564
565 device_release_driver(dev);
566 bus_topo_lock();
567 error = device_probe_and_attach(dev->bsddev);
568 bus_topo_unlock();
569
570 return (-error);
571 }
572
573 static inline void
device_set_wakeup_enable(struct device * dev __unused,bool enable __unused)574 device_set_wakeup_enable(struct device *dev __unused, bool enable __unused)
575 {
576
577 /*
578 * XXX-BZ TODO This is used by wireless drivers supporting WoWLAN which
579 * we currently do not support.
580 */
581 }
582
583 static inline int
device_wakeup_enable(struct device * dev)584 device_wakeup_enable(struct device *dev)
585 {
586
587 device_set_wakeup_enable(dev, true);
588 return (0);
589 }
590
591 static inline bool
device_iommu_mapped(struct device * dev __unused)592 device_iommu_mapped(struct device *dev __unused)
593 {
594 return (false);
595 }
596
597 #define dev_pm_set_driver_flags(dev, flags) do { \
598 } while (0)
599
600 static inline void
linux_class_kfree(struct class * class)601 linux_class_kfree(struct class *class)
602 {
603
604 kfree(class);
605 }
606
607 static inline void
class_destroy(struct class * class)608 class_destroy(struct class *class)
609 {
610
611 if (class == NULL)
612 return;
613 class_unregister(class);
614 }
615
616 static inline int
device_create_file(struct device * dev,const struct device_attribute * attr)617 device_create_file(struct device *dev, const struct device_attribute *attr)
618 {
619
620 if (dev)
621 return sysfs_create_file(&dev->kobj, &attr->attr);
622 return -EINVAL;
623 }
624
625 static inline void
device_remove_file(struct device * dev,const struct device_attribute * attr)626 device_remove_file(struct device *dev, const struct device_attribute *attr)
627 {
628
629 if (dev)
630 sysfs_remove_file(&dev->kobj, &attr->attr);
631 }
632
633 static inline int
class_create_file(struct class * class,const struct class_attribute * attr)634 class_create_file(struct class *class, const struct class_attribute *attr)
635 {
636
637 if (class)
638 return sysfs_create_file(&class->kobj, &attr->attr);
639 return -EINVAL;
640 }
641
642 static inline void
class_remove_file(struct class * class,const struct class_attribute * attr)643 class_remove_file(struct class *class, const struct class_attribute *attr)
644 {
645
646 if (class)
647 sysfs_remove_file(&class->kobj, &attr->attr);
648 }
649
650 #define dev_to_node(dev) linux_dev_to_node(dev)
651 #define of_node_to_nid(node) -1
652 int linux_dev_to_node(struct device *);
653
654 char *kvasprintf(gfp_t, const char *, va_list);
655 char *kasprintf(gfp_t, const char *, ...);
656 char *lkpi_devm_kasprintf(struct device *, gfp_t, const char *, ...);
657
658 #define devm_kasprintf(_dev, _gfp, _fmt, ...) \
659 lkpi_devm_kasprintf(_dev, _gfp, _fmt, ##__VA_ARGS__)
660
661 static __inline void *
devm_kmalloc(struct device * dev,size_t size,gfp_t gfp)662 devm_kmalloc(struct device *dev, size_t size, gfp_t gfp)
663 {
664 void *p;
665
666 p = lkpi_devres_alloc(lkpi_devm_kmalloc_release, size, gfp);
667 if (p != NULL)
668 lkpi_devres_add(dev, p);
669
670 return (p);
671 }
672
673 static inline void *
devm_kmemdup(struct device * dev,const void * src,size_t len,gfp_t gfp)674 devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp)
675 {
676 void *dst;
677
678 if (len == 0)
679 return (NULL);
680
681 dst = devm_kmalloc(dev, len, gfp);
682 if (dst != NULL)
683 memcpy(dst, src, len);
684
685 return (dst);
686 }
687
688 #define devm_kzalloc(_dev, _size, _gfp) \
689 devm_kmalloc((_dev), (_size), (_gfp) | __GFP_ZERO)
690
691 #define devm_kcalloc(_dev, _sizen, _size, _gfp) \
692 devm_kmalloc((_dev), ((_sizen) * (_size)), (_gfp) | __GFP_ZERO)
693
694 int lkpi_devm_add_action(struct device *dev, void (*action)(void *), void *data);
695 #define devm_add_action(dev, action, data) \
696 lkpi_devm_add_action(dev, action, data);
697 int lkpi_devm_add_action_or_reset(struct device *dev, void (*action)(void *), void *data);
698 #define devm_add_action_or_reset(dev, action, data) \
699 lkpi_devm_add_action_or_reset(dev, action, data)
700
701 #endif /* _LINUXKPI_LINUX_DEVICE_H_ */
702