2 * Generic pwmlib implementation
4 * Copyright (C) 2011 Sascha Hauer <s.hauer@pengutronix.de>
5 * Copyright (C) 2011-2012 Avionic Design GmbH
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2, or (at your option)
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; see the file COPYING. If not, write to
19 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/module.h>
23 #include <linux/pwm.h>
24 #include <linux/radix-tree.h>
25 #include <linux/list.h>
26 #include <linux/mutex.h>
27 #include <linux/err.h>
28 #include <linux/slab.h>
29 #include <linux/device.h>
30 #include <linux/debugfs.h>
31 #include <linux/seq_file.h>
33 #include <dt-bindings/pwm/pwm.h>
37 static DEFINE_MUTEX(pwm_lookup_lock
);
38 static LIST_HEAD(pwm_lookup_list
);
39 static DEFINE_MUTEX(pwm_lock
);
40 static LIST_HEAD(pwm_chips
);
41 static DECLARE_BITMAP(allocated_pwms
, MAX_PWMS
);
42 static RADIX_TREE(pwm_tree
, GFP_KERNEL
);
44 static struct pwm_device
*pwm_to_device(unsigned int pwm
)
46 return radix_tree_lookup(&pwm_tree
, pwm
);
49 static int alloc_pwms(int pwm
, unsigned int count
)
51 unsigned int from
= 0;
60 start
= bitmap_find_next_zero_area(allocated_pwms
, MAX_PWMS
, from
,
63 if (pwm
>= 0 && start
!= pwm
)
66 if (start
+ count
> MAX_PWMS
)
72 static void free_pwms(struct pwm_chip
*chip
)
76 for (i
= 0; i
< chip
->npwm
; i
++) {
77 struct pwm_device
*pwm
= &chip
->pwms
[i
];
78 radix_tree_delete(&pwm_tree
, pwm
->pwm
);
81 bitmap_clear(allocated_pwms
, chip
->base
, chip
->npwm
);
87 static struct pwm_chip
*pwmchip_find_by_name(const char *name
)
89 struct pwm_chip
*chip
;
94 mutex_lock(&pwm_lock
);
96 list_for_each_entry(chip
, &pwm_chips
, list
) {
97 const char *chip_name
= dev_name(chip
->dev
);
99 if (chip_name
&& strcmp(chip_name
, name
) == 0) {
100 mutex_unlock(&pwm_lock
);
105 mutex_unlock(&pwm_lock
);
110 static int pwm_device_request(struct pwm_device
*pwm
, const char *label
)
114 if (test_bit(PWMF_REQUESTED
, &pwm
->flags
))
117 if (!try_module_get(pwm
->chip
->ops
->owner
))
120 if (pwm
->chip
->ops
->request
) {
121 err
= pwm
->chip
->ops
->request(pwm
->chip
, pwm
);
123 module_put(pwm
->chip
->ops
->owner
);
128 set_bit(PWMF_REQUESTED
, &pwm
->flags
);
135 of_pwm_xlate_with_flags(struct pwm_chip
*pc
, const struct of_phandle_args
*args
)
137 struct pwm_device
*pwm
;
139 if (pc
->of_pwm_n_cells
< 3)
140 return ERR_PTR(-EINVAL
);
142 if (args
->args
[0] >= pc
->npwm
)
143 return ERR_PTR(-EINVAL
);
145 pwm
= pwm_request_from_chip(pc
, args
->args
[0], NULL
);
149 pwm
->args
.period
= args
->args
[1];
151 if (args
->args
[2] & PWM_POLARITY_INVERTED
)
152 pwm
->args
.polarity
= PWM_POLARITY_INVERSED
;
154 pwm
->args
.polarity
= PWM_POLARITY_NORMAL
;
158 EXPORT_SYMBOL_GPL(of_pwm_xlate_with_flags
);
160 static struct pwm_device
*
161 of_pwm_simple_xlate(struct pwm_chip
*pc
, const struct of_phandle_args
*args
)
163 struct pwm_device
*pwm
;
165 if (pc
->of_pwm_n_cells
< 2)
166 return ERR_PTR(-EINVAL
);
168 if (args
->args
[0] >= pc
->npwm
)
169 return ERR_PTR(-EINVAL
);
171 pwm
= pwm_request_from_chip(pc
, args
->args
[0], NULL
);
175 pwm
->args
.period
= args
->args
[1];
180 static void of_pwmchip_add(struct pwm_chip
*chip
)
182 if (!chip
->dev
|| !chip
->dev
->of_node
)
185 if (!chip
->of_xlate
) {
186 chip
->of_xlate
= of_pwm_simple_xlate
;
187 chip
->of_pwm_n_cells
= 2;
190 of_node_get(chip
->dev
->of_node
);
193 static void of_pwmchip_remove(struct pwm_chip
*chip
)
196 of_node_put(chip
->dev
->of_node
);
200 * pwm_set_chip_data() - set private chip data for a PWM
202 * @data: pointer to chip-specific data
204 * Returns: 0 on success or a negative error code on failure.
206 int pwm_set_chip_data(struct pwm_device
*pwm
, void *data
)
211 pwm
->chip_data
= data
;
215 EXPORT_SYMBOL_GPL(pwm_set_chip_data
);
218 * pwm_get_chip_data() - get private chip data for a PWM
221 * Returns: A pointer to the chip-private data for the PWM device.
223 void *pwm_get_chip_data(struct pwm_device
*pwm
)
225 return pwm
? pwm
->chip_data
: NULL
;
227 EXPORT_SYMBOL_GPL(pwm_get_chip_data
);
230 * pwmchip_add_with_polarity() - register a new PWM chip
231 * @chip: the PWM chip to add
232 * @polarity: initial polarity of PWM channels
234 * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
235 * will be used. The initial polarity for all channels is specified by the
236 * @polarity parameter.
238 * Returns: 0 on success or a negative error code on failure.
240 int pwmchip_add_with_polarity(struct pwm_chip
*chip
,
241 enum pwm_polarity polarity
)
243 struct pwm_device
*pwm
;
247 if (!chip
|| !chip
->dev
|| !chip
->ops
|| !chip
->ops
->config
||
248 !chip
->ops
->enable
|| !chip
->ops
->disable
|| !chip
->npwm
)
251 mutex_lock(&pwm_lock
);
253 ret
= alloc_pwms(chip
->base
, chip
->npwm
);
257 chip
->pwms
= kzalloc(chip
->npwm
* sizeof(*pwm
), GFP_KERNEL
);
265 for (i
= 0; i
< chip
->npwm
; i
++) {
266 pwm
= &chip
->pwms
[i
];
269 pwm
->pwm
= chip
->base
+ i
;
271 pwm
->state
.polarity
= polarity
;
273 radix_tree_insert(&pwm_tree
, pwm
->pwm
, pwm
);
276 bitmap_set(allocated_pwms
, chip
->base
, chip
->npwm
);
278 INIT_LIST_HEAD(&chip
->list
);
279 list_add(&chip
->list
, &pwm_chips
);
283 if (IS_ENABLED(CONFIG_OF
))
284 of_pwmchip_add(chip
);
286 pwmchip_sysfs_export(chip
);
289 mutex_unlock(&pwm_lock
);
292 EXPORT_SYMBOL_GPL(pwmchip_add_with_polarity
);
295 * pwmchip_add() - register a new PWM chip
296 * @chip: the PWM chip to add
298 * Register a new PWM chip. If chip->base < 0 then a dynamically assigned base
299 * will be used. The initial polarity for all channels is normal.
301 * Returns: 0 on success or a negative error code on failure.
303 int pwmchip_add(struct pwm_chip
*chip
)
305 return pwmchip_add_with_polarity(chip
, PWM_POLARITY_NORMAL
);
307 EXPORT_SYMBOL_GPL(pwmchip_add
);
310 * pwmchip_remove() - remove a PWM chip
311 * @chip: the PWM chip to remove
313 * Removes a PWM chip. This function may return busy if the PWM chip provides
314 * a PWM device that is still requested.
316 * Returns: 0 on success or a negative error code on failure.
318 int pwmchip_remove(struct pwm_chip
*chip
)
323 mutex_lock(&pwm_lock
);
325 for (i
= 0; i
< chip
->npwm
; i
++) {
326 struct pwm_device
*pwm
= &chip
->pwms
[i
];
328 if (test_bit(PWMF_REQUESTED
, &pwm
->flags
)) {
334 list_del_init(&chip
->list
);
336 if (IS_ENABLED(CONFIG_OF
))
337 of_pwmchip_remove(chip
);
341 pwmchip_sysfs_unexport(chip
);
344 mutex_unlock(&pwm_lock
);
347 EXPORT_SYMBOL_GPL(pwmchip_remove
);
350 * pwm_request() - request a PWM device
351 * @pwm: global PWM device index
352 * @label: PWM device label
354 * This function is deprecated, use pwm_get() instead.
356 * Returns: A pointer to a PWM device or an ERR_PTR()-encoded error code on
359 struct pwm_device
*pwm_request(int pwm
, const char *label
)
361 struct pwm_device
*dev
;
364 if (pwm
< 0 || pwm
>= MAX_PWMS
)
365 return ERR_PTR(-EINVAL
);
367 mutex_lock(&pwm_lock
);
369 dev
= pwm_to_device(pwm
);
371 dev
= ERR_PTR(-EPROBE_DEFER
);
375 err
= pwm_device_request(dev
, label
);
380 mutex_unlock(&pwm_lock
);
384 EXPORT_SYMBOL_GPL(pwm_request
);
387 * pwm_request_from_chip() - request a PWM device relative to a PWM chip
389 * @index: per-chip index of the PWM to request
390 * @label: a literal description string of this PWM
392 * Returns: A pointer to the PWM device at the given index of the given PWM
393 * chip. A negative error code is returned if the index is not valid for the
394 * specified PWM chip or if the PWM device cannot be requested.
396 struct pwm_device
*pwm_request_from_chip(struct pwm_chip
*chip
,
400 struct pwm_device
*pwm
;
403 if (!chip
|| index
>= chip
->npwm
)
404 return ERR_PTR(-EINVAL
);
406 mutex_lock(&pwm_lock
);
407 pwm
= &chip
->pwms
[index
];
409 err
= pwm_device_request(pwm
, label
);
413 mutex_unlock(&pwm_lock
);
416 EXPORT_SYMBOL_GPL(pwm_request_from_chip
);
419 * pwm_free() - free a PWM device
422 * This function is deprecated, use pwm_put() instead.
424 void pwm_free(struct pwm_device
*pwm
)
428 EXPORT_SYMBOL_GPL(pwm_free
);
431 * pwm_config() - change a PWM device configuration
433 * @duty_ns: "on" time (in nanoseconds)
434 * @period_ns: duration (in nanoseconds) of one cycle
436 * Returns: 0 on success or a negative error code on failure.
438 int pwm_config(struct pwm_device
*pwm
, int duty_ns
, int period_ns
)
442 if (!pwm
|| duty_ns
< 0 || period_ns
<= 0 || duty_ns
> period_ns
)
445 err
= pwm
->chip
->ops
->config(pwm
->chip
, pwm
, duty_ns
, period_ns
);
449 pwm
->state
.duty_cycle
= duty_ns
;
450 pwm
->state
.period
= period_ns
;
454 EXPORT_SYMBOL_GPL(pwm_config
);
457 * pwm_set_polarity() - configure the polarity of a PWM signal
459 * @polarity: new polarity of the PWM signal
461 * Note that the polarity cannot be configured while the PWM device is
464 * Returns: 0 on success or a negative error code on failure.
466 int pwm_set_polarity(struct pwm_device
*pwm
, enum pwm_polarity polarity
)
470 if (!pwm
|| !pwm
->chip
->ops
)
473 if (!pwm
->chip
->ops
->set_polarity
)
476 if (pwm_is_enabled(pwm
))
479 err
= pwm
->chip
->ops
->set_polarity(pwm
->chip
, pwm
, polarity
);
483 pwm
->state
.polarity
= polarity
;
487 EXPORT_SYMBOL_GPL(pwm_set_polarity
);
490 * pwm_enable() - start a PWM output toggling
493 * Returns: 0 on success or a negative error code on failure.
495 int pwm_enable(struct pwm_device
*pwm
)
502 if (!test_and_set_bit(PWMF_ENABLED
, &pwm
->flags
)) {
503 err
= pwm
->chip
->ops
->enable(pwm
->chip
, pwm
);
505 clear_bit(PWMF_ENABLED
, &pwm
->flags
);
510 EXPORT_SYMBOL_GPL(pwm_enable
);
513 * pwm_disable() - stop a PWM output toggling
516 void pwm_disable(struct pwm_device
*pwm
)
518 if (pwm
&& test_and_clear_bit(PWMF_ENABLED
, &pwm
->flags
))
519 pwm
->chip
->ops
->disable(pwm
->chip
, pwm
);
521 EXPORT_SYMBOL_GPL(pwm_disable
);
523 static struct pwm_chip
*of_node_to_pwmchip(struct device_node
*np
)
525 struct pwm_chip
*chip
;
527 mutex_lock(&pwm_lock
);
529 list_for_each_entry(chip
, &pwm_chips
, list
)
530 if (chip
->dev
&& chip
->dev
->of_node
== np
) {
531 mutex_unlock(&pwm_lock
);
535 mutex_unlock(&pwm_lock
);
537 return ERR_PTR(-EPROBE_DEFER
);
541 * of_pwm_get() - request a PWM via the PWM framework
542 * @np: device node to get the PWM from
543 * @con_id: consumer name
545 * Returns the PWM device parsed from the phandle and index specified in the
546 * "pwms" property of a device tree node or a negative error-code on failure.
547 * Values parsed from the device tree are stored in the returned PWM device
550 * If con_id is NULL, the first PWM device listed in the "pwms" property will
551 * be requested. Otherwise the "pwm-names" property is used to do a reverse
552 * lookup of the PWM index. This also means that the "pwm-names" property
553 * becomes mandatory for devices that look up the PWM device via the con_id
556 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
557 * error code on failure.
559 struct pwm_device
*of_pwm_get(struct device_node
*np
, const char *con_id
)
561 struct pwm_device
*pwm
= NULL
;
562 struct of_phandle_args args
;
568 index
= of_property_match_string(np
, "pwm-names", con_id
);
570 return ERR_PTR(index
);
573 err
= of_parse_phandle_with_args(np
, "pwms", "#pwm-cells", index
,
576 pr_debug("%s(): can't parse \"pwms\" property\n", __func__
);
580 pc
= of_node_to_pwmchip(args
.np
);
582 pr_debug("%s(): PWM chip not found\n", __func__
);
587 if (args
.args_count
!= pc
->of_pwm_n_cells
) {
588 pr_debug("%s: wrong #pwm-cells for %s\n", np
->full_name
,
590 pwm
= ERR_PTR(-EINVAL
);
594 pwm
= pc
->of_xlate(pc
, &args
);
599 * If a consumer name was not given, try to look it up from the
600 * "pwm-names" property if it exists. Otherwise use the name of
601 * the user device node.
604 err
= of_property_read_string_index(np
, "pwm-names", index
,
613 of_node_put(args
.np
);
617 EXPORT_SYMBOL_GPL(of_pwm_get
);
620 * pwm_add_table() - register PWM device consumers
621 * @table: array of consumers to register
622 * @num: number of consumers in table
624 void pwm_add_table(struct pwm_lookup
*table
, size_t num
)
626 mutex_lock(&pwm_lookup_lock
);
629 list_add_tail(&table
->list
, &pwm_lookup_list
);
633 mutex_unlock(&pwm_lookup_lock
);
637 * pwm_remove_table() - unregister PWM device consumers
638 * @table: array of consumers to unregister
639 * @num: number of consumers in table
641 void pwm_remove_table(struct pwm_lookup
*table
, size_t num
)
643 mutex_lock(&pwm_lookup_lock
);
646 list_del(&table
->list
);
650 mutex_unlock(&pwm_lookup_lock
);
654 * pwm_get() - look up and request a PWM device
655 * @dev: device for PWM consumer
656 * @con_id: consumer name
658 * Lookup is first attempted using DT. If the device was not instantiated from
659 * a device tree, a PWM chip and a relative index is looked up via a table
660 * supplied by board setup code (see pwm_add_table()).
662 * Once a PWM chip has been found the specified PWM device will be requested
663 * and is ready to be used.
665 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
666 * error code on failure.
668 struct pwm_device
*pwm_get(struct device
*dev
, const char *con_id
)
670 struct pwm_device
*pwm
= ERR_PTR(-EPROBE_DEFER
);
671 const char *dev_id
= dev
? dev_name(dev
) : NULL
;
672 struct pwm_chip
*chip
= NULL
;
673 unsigned int best
= 0;
674 struct pwm_lookup
*p
, *chosen
= NULL
;
677 /* look up via DT first */
678 if (IS_ENABLED(CONFIG_OF
) && dev
&& dev
->of_node
)
679 return of_pwm_get(dev
->of_node
, con_id
);
682 * We look up the provider in the static table typically provided by
683 * board setup code. We first try to lookup the consumer device by
684 * name. If the consumer device was passed in as NULL or if no match
685 * was found, we try to find the consumer by directly looking it up
688 * If a match is found, the provider PWM chip is looked up by name
689 * and a PWM device is requested using the PWM device per-chip index.
691 * The lookup algorithm was shamelessly taken from the clock
694 * We do slightly fuzzy matching here:
695 * An entry with a NULL ID is assumed to be a wildcard.
696 * If an entry has a device ID, it must match
697 * If an entry has a connection ID, it must match
698 * Then we take the most specific entry - with the following order
699 * of precedence: dev+con > dev only > con only.
701 mutex_lock(&pwm_lookup_lock
);
703 list_for_each_entry(p
, &pwm_lookup_list
, list
) {
707 if (!dev_id
|| strcmp(p
->dev_id
, dev_id
))
714 if (!con_id
|| strcmp(p
->con_id
, con_id
))
731 pwm
= ERR_PTR(-ENODEV
);
735 chip
= pwmchip_find_by_name(chosen
->provider
);
739 pwm
= pwm_request_from_chip(chip
, chosen
->index
, con_id
?: dev_id
);
743 pwm
->args
.period
= chosen
->period
;
744 pwm
->args
.polarity
= chosen
->polarity
;
747 mutex_unlock(&pwm_lookup_lock
);
750 EXPORT_SYMBOL_GPL(pwm_get
);
753 * pwm_put() - release a PWM device
756 void pwm_put(struct pwm_device
*pwm
)
761 mutex_lock(&pwm_lock
);
763 if (!test_and_clear_bit(PWMF_REQUESTED
, &pwm
->flags
)) {
764 pr_warn("PWM device already freed\n");
768 if (pwm
->chip
->ops
->free
)
769 pwm
->chip
->ops
->free(pwm
->chip
, pwm
);
773 module_put(pwm
->chip
->ops
->owner
);
775 mutex_unlock(&pwm_lock
);
777 EXPORT_SYMBOL_GPL(pwm_put
);
779 static void devm_pwm_release(struct device
*dev
, void *res
)
781 pwm_put(*(struct pwm_device
**)res
);
785 * devm_pwm_get() - resource managed pwm_get()
786 * @dev: device for PWM consumer
787 * @con_id: consumer name
789 * This function performs like pwm_get() but the acquired PWM device will
790 * automatically be released on driver detach.
792 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
793 * error code on failure.
795 struct pwm_device
*devm_pwm_get(struct device
*dev
, const char *con_id
)
797 struct pwm_device
**ptr
, *pwm
;
799 ptr
= devres_alloc(devm_pwm_release
, sizeof(*ptr
), GFP_KERNEL
);
801 return ERR_PTR(-ENOMEM
);
803 pwm
= pwm_get(dev
, con_id
);
806 devres_add(dev
, ptr
);
813 EXPORT_SYMBOL_GPL(devm_pwm_get
);
816 * devm_of_pwm_get() - resource managed of_pwm_get()
817 * @dev: device for PWM consumer
818 * @np: device node to get the PWM from
819 * @con_id: consumer name
821 * This function performs like of_pwm_get() but the acquired PWM device will
822 * automatically be released on driver detach.
824 * Returns: A pointer to the requested PWM device or an ERR_PTR()-encoded
825 * error code on failure.
827 struct pwm_device
*devm_of_pwm_get(struct device
*dev
, struct device_node
*np
,
830 struct pwm_device
**ptr
, *pwm
;
832 ptr
= devres_alloc(devm_pwm_release
, sizeof(*ptr
), GFP_KERNEL
);
834 return ERR_PTR(-ENOMEM
);
836 pwm
= of_pwm_get(np
, con_id
);
839 devres_add(dev
, ptr
);
846 EXPORT_SYMBOL_GPL(devm_of_pwm_get
);
848 static int devm_pwm_match(struct device
*dev
, void *res
, void *data
)
850 struct pwm_device
**p
= res
;
852 if (WARN_ON(!p
|| !*p
))
859 * devm_pwm_put() - resource managed pwm_put()
860 * @dev: device for PWM consumer
863 * Release a PWM previously allocated using devm_pwm_get(). Calling this
864 * function is usually not needed because devm-allocated resources are
865 * automatically released on driver detach.
867 void devm_pwm_put(struct device
*dev
, struct pwm_device
*pwm
)
869 WARN_ON(devres_release(dev
, devm_pwm_release
, devm_pwm_match
, pwm
));
871 EXPORT_SYMBOL_GPL(devm_pwm_put
);
874 * pwm_can_sleep() - report whether PWM access will sleep
877 * Returns: True if accessing the PWM can sleep, false otherwise.
879 bool pwm_can_sleep(struct pwm_device
*pwm
)
883 EXPORT_SYMBOL_GPL(pwm_can_sleep
);
885 #ifdef CONFIG_DEBUG_FS
886 static void pwm_dbg_show(struct pwm_chip
*chip
, struct seq_file
*s
)
890 for (i
= 0; i
< chip
->npwm
; i
++) {
891 struct pwm_device
*pwm
= &chip
->pwms
[i
];
893 seq_printf(s
, " pwm-%-3d (%-20.20s):", i
, pwm
->label
);
895 if (test_bit(PWMF_REQUESTED
, &pwm
->flags
))
896 seq_puts(s
, " requested");
898 if (pwm_is_enabled(pwm
))
899 seq_puts(s
, " enabled");
905 static void *pwm_seq_start(struct seq_file
*s
, loff_t
*pos
)
907 mutex_lock(&pwm_lock
);
910 return seq_list_start(&pwm_chips
, *pos
);
913 static void *pwm_seq_next(struct seq_file
*s
, void *v
, loff_t
*pos
)
917 return seq_list_next(v
, &pwm_chips
, pos
);
920 static void pwm_seq_stop(struct seq_file
*s
, void *v
)
922 mutex_unlock(&pwm_lock
);
925 static int pwm_seq_show(struct seq_file
*s
, void *v
)
927 struct pwm_chip
*chip
= list_entry(v
, struct pwm_chip
, list
);
929 seq_printf(s
, "%s%s/%s, %d PWM device%s\n", (char *)s
->private,
930 chip
->dev
->bus
? chip
->dev
->bus
->name
: "no-bus",
931 dev_name(chip
->dev
), chip
->npwm
,
932 (chip
->npwm
!= 1) ? "s" : "");
934 if (chip
->ops
->dbg_show
)
935 chip
->ops
->dbg_show(chip
, s
);
937 pwm_dbg_show(chip
, s
);
942 static const struct seq_operations pwm_seq_ops
= {
943 .start
= pwm_seq_start
,
944 .next
= pwm_seq_next
,
945 .stop
= pwm_seq_stop
,
946 .show
= pwm_seq_show
,
949 static int pwm_seq_open(struct inode
*inode
, struct file
*file
)
951 return seq_open(file
, &pwm_seq_ops
);
954 static const struct file_operations pwm_debugfs_ops
= {
955 .owner
= THIS_MODULE
,
956 .open
= pwm_seq_open
,
959 .release
= seq_release
,
962 static int __init
pwm_debugfs_init(void)
964 debugfs_create_file("pwm", S_IFREG
| S_IRUGO
, NULL
, NULL
,
969 subsys_initcall(pwm_debugfs_init
);
970 #endif /* CONFIG_DEBUG_FS */