xref: /linux/sound/core/jack.c (revision 36ec807b627b4c0a0a382f0ae48eac7187d14b2b)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Jack abstraction layer
4  *
5  *  Copyright 2008 Wolfson Microelectronics
6  */
7 
8 #include <linux/input.h>
9 #include <linux/slab.h>
10 #include <linux/module.h>
11 #include <linux/ctype.h>
12 #include <linux/mm.h>
13 #include <linux/debugfs.h>
14 #include <sound/jack.h>
15 #include <sound/core.h>
16 #include <sound/control.h>
17 
18 struct snd_jack_kctl {
19 	struct snd_kcontrol *kctl;
20 	struct list_head list;  /* list of controls belong to the same jack */
21 	unsigned int mask_bits; /* only masked status bits are reported via kctl */
22 	struct snd_jack *jack;  /* pointer to struct snd_jack */
23 	bool sw_inject_enable;  /* allow to inject plug event via debugfs */
24 #ifdef CONFIG_SND_JACK_INJECTION_DEBUG
25 	struct dentry *jack_debugfs_root; /* jack_kctl debugfs root */
26 #endif
27 };
28 
29 #ifdef CONFIG_SND_JACK_INPUT_DEV
30 static const int jack_switch_types[SND_JACK_SWITCH_TYPES] = {
31 	SW_HEADPHONE_INSERT,
32 	SW_MICROPHONE_INSERT,
33 	SW_LINEOUT_INSERT,
34 	SW_JACK_PHYSICAL_INSERT,
35 	SW_VIDEOOUT_INSERT,
36 	SW_LINEIN_INSERT,
37 };
38 #endif /* CONFIG_SND_JACK_INPUT_DEV */
39 
40 static void snd_jack_remove_debugfs(struct snd_jack *jack);
41 
42 static int snd_jack_dev_disconnect(struct snd_device *device)
43 {
44 	struct snd_jack *jack = device->device_data;
45 
46 	snd_jack_remove_debugfs(jack);
47 
48 #ifdef CONFIG_SND_JACK_INPUT_DEV
49 	guard(mutex)(&jack->input_dev_lock);
50 	if (!jack->input_dev)
51 		return 0;
52 
53 	/* If the input device is registered with the input subsystem
54 	 * then we need to use a different deallocator. */
55 	if (jack->registered)
56 		input_unregister_device(jack->input_dev);
57 	else
58 		input_free_device(jack->input_dev);
59 	jack->input_dev = NULL;
60 #endif /* CONFIG_SND_JACK_INPUT_DEV */
61 	return 0;
62 }
63 
64 static int snd_jack_dev_free(struct snd_device *device)
65 {
66 	struct snd_jack *jack = device->device_data;
67 	struct snd_card *card = device->card;
68 	struct snd_jack_kctl *jack_kctl, *tmp_jack_kctl;
69 
70 	list_for_each_entry_safe(jack_kctl, tmp_jack_kctl, &jack->kctl_list, list) {
71 		list_del_init(&jack_kctl->list);
72 		snd_ctl_remove(card, jack_kctl->kctl);
73 	}
74 
75 	if (jack->private_free)
76 		jack->private_free(jack);
77 
78 	snd_jack_dev_disconnect(device);
79 
80 	kfree(jack->id);
81 	kfree(jack);
82 
83 	return 0;
84 }
85 
86 #ifdef CONFIG_SND_JACK_INPUT_DEV
87 static int snd_jack_dev_register(struct snd_device *device)
88 {
89 	struct snd_jack *jack = device->device_data;
90 	struct snd_card *card = device->card;
91 	int err, i;
92 
93 	snprintf(jack->name, sizeof(jack->name), "%s %s",
94 		 card->shortname, jack->id);
95 
96 	guard(mutex)(&jack->input_dev_lock);
97 	if (!jack->input_dev)
98 		return 0;
99 
100 	jack->input_dev->name = jack->name;
101 
102 	/* Default to the sound card device. */
103 	if (!jack->input_dev->dev.parent)
104 		jack->input_dev->dev.parent = snd_card_get_device_link(card);
105 
106 	/* Add capabilities for any keys that are enabled */
107 	for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
108 		int testbit = SND_JACK_BTN_0 >> i;
109 
110 		if (!(jack->type & testbit))
111 			continue;
112 
113 		if (!jack->key[i])
114 			jack->key[i] = BTN_0 + i;
115 
116 		input_set_capability(jack->input_dev, EV_KEY, jack->key[i]);
117 	}
118 
119 	err = input_register_device(jack->input_dev);
120 	if (err == 0)
121 		jack->registered = 1;
122 
123 	return err;
124 }
125 #endif /* CONFIG_SND_JACK_INPUT_DEV */
126 
127 #ifdef CONFIG_SND_JACK_INJECTION_DEBUG
128 static void snd_jack_inject_report(struct snd_jack_kctl *jack_kctl, int status)
129 {
130 	struct snd_jack *jack;
131 #ifdef CONFIG_SND_JACK_INPUT_DEV
132 	int i;
133 #endif
134 	if (!jack_kctl)
135 		return;
136 
137 	jack = jack_kctl->jack;
138 
139 	if (jack_kctl->sw_inject_enable)
140 		snd_kctl_jack_report(jack->card, jack_kctl->kctl,
141 				     status & jack_kctl->mask_bits);
142 
143 #ifdef CONFIG_SND_JACK_INPUT_DEV
144 	if (!jack->input_dev)
145 		return;
146 
147 	for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
148 		int testbit = ((SND_JACK_BTN_0 >> i) & jack_kctl->mask_bits);
149 
150 		if (jack->type & testbit)
151 			input_report_key(jack->input_dev, jack->key[i],
152 					 status & testbit);
153 	}
154 
155 	for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
156 		int testbit = ((1 << i) & jack_kctl->mask_bits);
157 
158 		if (jack->type & testbit)
159 			input_report_switch(jack->input_dev,
160 					    jack_switch_types[i],
161 					    status & testbit);
162 	}
163 
164 	input_sync(jack->input_dev);
165 #endif /* CONFIG_SND_JACK_INPUT_DEV */
166 }
167 
168 static ssize_t sw_inject_enable_read(struct file *file,
169 				     char __user *to, size_t count, loff_t *ppos)
170 {
171 	struct snd_jack_kctl *jack_kctl = file->private_data;
172 	int len, ret;
173 	char buf[128];
174 
175 	len = scnprintf(buf, sizeof(buf), "%s: %s\t\t%s: %i\n", "Jack", jack_kctl->kctl->id.name,
176 			"Inject Enabled", jack_kctl->sw_inject_enable);
177 	ret = simple_read_from_buffer(to, count, ppos, buf, len);
178 
179 	return ret;
180 }
181 
182 static ssize_t sw_inject_enable_write(struct file *file,
183 				      const char __user *from, size_t count, loff_t *ppos)
184 {
185 	struct snd_jack_kctl *jack_kctl = file->private_data;
186 	int ret, err;
187 	unsigned long enable;
188 	char buf[8] = { 0 };
189 
190 	ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
191 	err = kstrtoul(buf, 0, &enable);
192 	if (err)
193 		return err;
194 
195 	if (jack_kctl->sw_inject_enable == (!!enable))
196 		return ret;
197 
198 	jack_kctl->sw_inject_enable = !!enable;
199 
200 	if (!jack_kctl->sw_inject_enable)
201 		snd_jack_report(jack_kctl->jack, jack_kctl->jack->hw_status_cache);
202 
203 	return ret;
204 }
205 
206 static ssize_t jackin_inject_write(struct file *file,
207 				   const char __user *from, size_t count, loff_t *ppos)
208 {
209 	struct snd_jack_kctl *jack_kctl = file->private_data;
210 	int ret, err;
211 	unsigned long enable;
212 	char buf[8] = { 0 };
213 
214 	if (!jack_kctl->sw_inject_enable)
215 		return -EINVAL;
216 
217 	ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, from, count);
218 	err = kstrtoul(buf, 0, &enable);
219 	if (err)
220 		return err;
221 
222 	snd_jack_inject_report(jack_kctl, !!enable ? jack_kctl->mask_bits : 0);
223 
224 	return ret;
225 }
226 
227 static ssize_t jack_kctl_id_read(struct file *file,
228 				 char __user *to, size_t count, loff_t *ppos)
229 {
230 	struct snd_jack_kctl *jack_kctl = file->private_data;
231 	char buf[64];
232 	int len, ret;
233 
234 	len = scnprintf(buf, sizeof(buf), "%s\n", jack_kctl->kctl->id.name);
235 	ret = simple_read_from_buffer(to, count, ppos, buf, len);
236 
237 	return ret;
238 }
239 
240 /* the bit definition is aligned with snd_jack_types in jack.h */
241 static const char * const jack_events_name[] = {
242 	"HEADPHONE(0x0001)", "MICROPHONE(0x0002)", "LINEOUT(0x0004)",
243 	"MECHANICAL(0x0008)", "VIDEOOUT(0x0010)", "LINEIN(0x0020)",
244 	"", "", "", "BTN_5(0x0200)", "BTN_4(0x0400)", "BTN_3(0x0800)",
245 	"BTN_2(0x1000)", "BTN_1(0x2000)", "BTN_0(0x4000)", "",
246 };
247 
248 /* the recommended buffer size is 256 */
249 static int parse_mask_bits(unsigned int mask_bits, char *buf, size_t buf_size)
250 {
251 	int i;
252 
253 	scnprintf(buf, buf_size, "0x%04x", mask_bits);
254 
255 	for (i = 0; i < ARRAY_SIZE(jack_events_name); i++)
256 		if (mask_bits & (1 << i)) {
257 			strlcat(buf, " ", buf_size);
258 			strlcat(buf, jack_events_name[i], buf_size);
259 		}
260 	strlcat(buf, "\n", buf_size);
261 
262 	return strlen(buf);
263 }
264 
265 static ssize_t jack_kctl_mask_bits_read(struct file *file,
266 					char __user *to, size_t count, loff_t *ppos)
267 {
268 	struct snd_jack_kctl *jack_kctl = file->private_data;
269 	char buf[256];
270 	int len, ret;
271 
272 	len = parse_mask_bits(jack_kctl->mask_bits, buf, sizeof(buf));
273 	ret = simple_read_from_buffer(to, count, ppos, buf, len);
274 
275 	return ret;
276 }
277 
278 static ssize_t jack_kctl_status_read(struct file *file,
279 				     char __user *to, size_t count, loff_t *ppos)
280 {
281 	struct snd_jack_kctl *jack_kctl = file->private_data;
282 	char buf[16];
283 	int len, ret;
284 
285 	len = scnprintf(buf, sizeof(buf), "%s\n", jack_kctl->kctl->private_value ?
286 			"Plugged" : "Unplugged");
287 	ret = simple_read_from_buffer(to, count, ppos, buf, len);
288 
289 	return ret;
290 }
291 
292 #ifdef CONFIG_SND_JACK_INPUT_DEV
293 static ssize_t jack_type_read(struct file *file,
294 			      char __user *to, size_t count, loff_t *ppos)
295 {
296 	struct snd_jack_kctl *jack_kctl = file->private_data;
297 	char buf[256];
298 	int len, ret;
299 
300 	len = parse_mask_bits(jack_kctl->jack->type, buf, sizeof(buf));
301 	ret = simple_read_from_buffer(to, count, ppos, buf, len);
302 
303 	return ret;
304 }
305 
306 static const struct file_operations jack_type_fops = {
307 	.open = simple_open,
308 	.read = jack_type_read,
309 	.llseek = default_llseek,
310 };
311 #endif
312 
313 static const struct file_operations sw_inject_enable_fops = {
314 	.open = simple_open,
315 	.read = sw_inject_enable_read,
316 	.write = sw_inject_enable_write,
317 	.llseek = default_llseek,
318 };
319 
320 static const struct file_operations jackin_inject_fops = {
321 	.open = simple_open,
322 	.write = jackin_inject_write,
323 	.llseek = default_llseek,
324 };
325 
326 static const struct file_operations jack_kctl_id_fops = {
327 	.open = simple_open,
328 	.read = jack_kctl_id_read,
329 	.llseek = default_llseek,
330 };
331 
332 static const struct file_operations jack_kctl_mask_bits_fops = {
333 	.open = simple_open,
334 	.read = jack_kctl_mask_bits_read,
335 	.llseek = default_llseek,
336 };
337 
338 static const struct file_operations jack_kctl_status_fops = {
339 	.open = simple_open,
340 	.read = jack_kctl_status_read,
341 	.llseek = default_llseek,
342 };
343 
344 static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
345 					    struct snd_jack_kctl *jack_kctl)
346 {
347 	char *tname;
348 	int i;
349 
350 	/* Don't create injection interface for Phantom jacks */
351 	if (strstr(jack_kctl->kctl->id.name, "Phantom"))
352 		return 0;
353 
354 	tname = kstrdup(jack_kctl->kctl->id.name, GFP_KERNEL);
355 	if (!tname)
356 		return -ENOMEM;
357 
358 	/* replace the chars which are not suitable for folder's name with _ */
359 	for (i = 0; tname[i]; i++)
360 		if (!isalnum(tname[i]))
361 			tname[i] = '_';
362 
363 	jack_kctl->jack_debugfs_root = debugfs_create_dir(tname, jack->card->debugfs_root);
364 	kfree(tname);
365 
366 	debugfs_create_file("sw_inject_enable", 0644, jack_kctl->jack_debugfs_root, jack_kctl,
367 			    &sw_inject_enable_fops);
368 
369 	debugfs_create_file("jackin_inject", 0200, jack_kctl->jack_debugfs_root, jack_kctl,
370 			    &jackin_inject_fops);
371 
372 	debugfs_create_file("kctl_id", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
373 			    &jack_kctl_id_fops);
374 
375 	debugfs_create_file("mask_bits", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
376 			    &jack_kctl_mask_bits_fops);
377 
378 	debugfs_create_file("status", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
379 			    &jack_kctl_status_fops);
380 
381 #ifdef CONFIG_SND_JACK_INPUT_DEV
382 	debugfs_create_file("type", 0444, jack_kctl->jack_debugfs_root, jack_kctl,
383 			    &jack_type_fops);
384 #endif
385 	return 0;
386 }
387 
388 static void snd_jack_remove_debugfs(struct snd_jack *jack)
389 {
390 	struct snd_jack_kctl *jack_kctl;
391 
392 	list_for_each_entry(jack_kctl, &jack->kctl_list, list) {
393 		debugfs_remove(jack_kctl->jack_debugfs_root);
394 		jack_kctl->jack_debugfs_root = NULL;
395 	}
396 }
397 #else /* CONFIG_SND_JACK_INJECTION_DEBUG */
398 static int snd_jack_debugfs_add_inject_node(struct snd_jack *jack,
399 					    struct snd_jack_kctl *jack_kctl)
400 {
401 	return 0;
402 }
403 
404 static void snd_jack_remove_debugfs(struct snd_jack *jack)
405 {
406 }
407 #endif /* CONFIG_SND_JACK_INJECTION_DEBUG */
408 
409 static void snd_jack_kctl_private_free(struct snd_kcontrol *kctl)
410 {
411 	struct snd_jack_kctl *jack_kctl;
412 
413 	jack_kctl = kctl->private_data;
414 	if (jack_kctl) {
415 		list_del(&jack_kctl->list);
416 		kfree(jack_kctl);
417 	}
418 }
419 
420 static void snd_jack_kctl_add(struct snd_jack *jack, struct snd_jack_kctl *jack_kctl)
421 {
422 	jack_kctl->jack = jack;
423 	list_add_tail(&jack_kctl->list, &jack->kctl_list);
424 	snd_jack_debugfs_add_inject_node(jack, jack_kctl);
425 }
426 
427 static struct snd_jack_kctl * snd_jack_kctl_new(struct snd_card *card, const char *name, unsigned int mask)
428 {
429 	struct snd_kcontrol *kctl;
430 	struct snd_jack_kctl *jack_kctl;
431 	int err;
432 
433 	kctl = snd_kctl_jack_new(name, card);
434 	if (!kctl)
435 		return NULL;
436 
437 	err = snd_ctl_add(card, kctl);
438 	if (err < 0)
439 		return NULL;
440 
441 	jack_kctl = kzalloc(sizeof(*jack_kctl), GFP_KERNEL);
442 
443 	if (!jack_kctl)
444 		goto error;
445 
446 	jack_kctl->kctl = kctl;
447 	jack_kctl->mask_bits = mask;
448 
449 	kctl->private_data = jack_kctl;
450 	kctl->private_free = snd_jack_kctl_private_free;
451 
452 	return jack_kctl;
453 error:
454 	snd_ctl_free_one(kctl);
455 	return NULL;
456 }
457 
458 /**
459  * snd_jack_add_new_kctl - Create a new snd_jack_kctl and add it to jack
460  * @jack:  the jack instance which the kctl will attaching to
461  * @name:  the name for the snd_kcontrol object
462  * @mask:  a bitmask of enum snd_jack_type values that can be detected
463  *         by this snd_jack_kctl object.
464  *
465  * Creates a new snd_kcontrol object and adds it to the jack kctl_list.
466  *
467  * Return: Zero if successful, or a negative error code on failure.
468  */
469 int snd_jack_add_new_kctl(struct snd_jack *jack, const char * name, int mask)
470 {
471 	struct snd_jack_kctl *jack_kctl;
472 
473 	jack_kctl = snd_jack_kctl_new(jack->card, name, mask);
474 	if (!jack_kctl)
475 		return -ENOMEM;
476 
477 	snd_jack_kctl_add(jack, jack_kctl);
478 	return 0;
479 }
480 EXPORT_SYMBOL(snd_jack_add_new_kctl);
481 
482 /**
483  * snd_jack_new - Create a new jack
484  * @card:  the card instance
485  * @id:    an identifying string for this jack
486  * @type:  a bitmask of enum snd_jack_type values that can be detected by
487  *         this jack
488  * @jjack: Used to provide the allocated jack object to the caller.
489  * @initial_kctl: if true, create a kcontrol and add it to the jack list.
490  * @phantom_jack: Don't create a input device for phantom jacks.
491  *
492  * Creates a new jack object.
493  *
494  * Return: Zero if successful, or a negative error code on failure.
495  * On success @jjack will be initialised.
496  */
497 int snd_jack_new(struct snd_card *card, const char *id, int type,
498 		 struct snd_jack **jjack, bool initial_kctl, bool phantom_jack)
499 {
500 	struct snd_jack *jack;
501 	struct snd_jack_kctl *jack_kctl = NULL;
502 	int err;
503 	static const struct snd_device_ops ops = {
504 		.dev_free = snd_jack_dev_free,
505 #ifdef CONFIG_SND_JACK_INPUT_DEV
506 		.dev_register = snd_jack_dev_register,
507 #endif /* CONFIG_SND_JACK_INPUT_DEV */
508 		.dev_disconnect = snd_jack_dev_disconnect,
509 	};
510 
511 	if (initial_kctl) {
512 		jack_kctl = snd_jack_kctl_new(card, id, type);
513 		if (!jack_kctl)
514 			return -ENOMEM;
515 	}
516 
517 	jack = kzalloc(sizeof(struct snd_jack), GFP_KERNEL);
518 	if (jack == NULL)
519 		return -ENOMEM;
520 
521 	jack->id = kstrdup(id, GFP_KERNEL);
522 	if (jack->id == NULL) {
523 		kfree(jack);
524 		return -ENOMEM;
525 	}
526 
527 #ifdef CONFIG_SND_JACK_INPUT_DEV
528 	mutex_init(&jack->input_dev_lock);
529 
530 	/* don't create input device for phantom jack */
531 	if (!phantom_jack) {
532 		int i;
533 
534 		jack->input_dev = input_allocate_device();
535 		if (jack->input_dev == NULL) {
536 			err = -ENOMEM;
537 			goto fail_input;
538 		}
539 
540 		jack->input_dev->phys = "ALSA";
541 
542 		jack->type = type;
543 
544 		for (i = 0; i < SND_JACK_SWITCH_TYPES; i++)
545 			if (type & (1 << i))
546 				input_set_capability(jack->input_dev, EV_SW,
547 						     jack_switch_types[i]);
548 
549 	}
550 #endif /* CONFIG_SND_JACK_INPUT_DEV */
551 
552 	err = snd_device_new(card, SNDRV_DEV_JACK, jack, &ops);
553 	if (err < 0)
554 		goto fail_input;
555 
556 	jack->card = card;
557 	INIT_LIST_HEAD(&jack->kctl_list);
558 
559 	if (initial_kctl)
560 		snd_jack_kctl_add(jack, jack_kctl);
561 
562 	*jjack = jack;
563 
564 	return 0;
565 
566 fail_input:
567 #ifdef CONFIG_SND_JACK_INPUT_DEV
568 	input_free_device(jack->input_dev);
569 #endif
570 	kfree(jack->id);
571 	kfree(jack);
572 	return err;
573 }
574 EXPORT_SYMBOL(snd_jack_new);
575 
576 #ifdef CONFIG_SND_JACK_INPUT_DEV
577 /**
578  * snd_jack_set_parent - Set the parent device for a jack
579  *
580  * @jack:   The jack to configure
581  * @parent: The device to set as parent for the jack.
582  *
583  * Set the parent for the jack devices in the device tree.  This
584  * function is only valid prior to registration of the jack.  If no
585  * parent is configured then the parent device will be the sound card.
586  */
587 void snd_jack_set_parent(struct snd_jack *jack, struct device *parent)
588 {
589 	WARN_ON(jack->registered);
590 	guard(mutex)(&jack->input_dev_lock);
591 	if (jack->input_dev)
592 		jack->input_dev->dev.parent = parent;
593 }
594 EXPORT_SYMBOL(snd_jack_set_parent);
595 
596 /**
597  * snd_jack_set_key - Set a key mapping on a jack
598  *
599  * @jack:    The jack to configure
600  * @type:    Jack report type for this key
601  * @keytype: Input layer key type to be reported
602  *
603  * Map a SND_JACK_BTN_* button type to an input layer key, allowing
604  * reporting of keys on accessories via the jack abstraction.  If no
605  * mapping is provided but keys are enabled in the jack type then
606  * BTN_n numeric buttons will be reported.
607  *
608  * If jacks are not reporting via the input API this call will have no
609  * effect.
610  *
611  * Note that this is intended to be use by simple devices with small
612  * numbers of keys that can be reported.  It is also possible to
613  * access the input device directly - devices with complex input
614  * capabilities on accessories should consider doing this rather than
615  * using this abstraction.
616  *
617  * This function may only be called prior to registration of the jack.
618  *
619  * Return: Zero if successful, or a negative error code on failure.
620  */
621 int snd_jack_set_key(struct snd_jack *jack, enum snd_jack_types type,
622 		     int keytype)
623 {
624 	int key = fls(SND_JACK_BTN_0) - fls(type);
625 
626 	WARN_ON(jack->registered);
627 
628 	if (!keytype || key >= ARRAY_SIZE(jack->key))
629 		return -EINVAL;
630 
631 	jack->type |= type;
632 	jack->key[key] = keytype;
633 	return 0;
634 }
635 EXPORT_SYMBOL(snd_jack_set_key);
636 #endif /* CONFIG_SND_JACK_INPUT_DEV */
637 
638 /**
639  * snd_jack_report - Report the current status of a jack
640  * Note: This function uses mutexes and should be called from a
641  * context which can sleep (such as a workqueue).
642  *
643  * @jack:   The jack to report status for
644  * @status: The current status of the jack
645  */
646 void snd_jack_report(struct snd_jack *jack, int status)
647 {
648 	struct snd_jack_kctl *jack_kctl;
649 	unsigned int mask_bits = 0;
650 #ifdef CONFIG_SND_JACK_INPUT_DEV
651 	struct input_dev *idev;
652 	int i;
653 #endif
654 
655 	if (!jack)
656 		return;
657 
658 	jack->hw_status_cache = status;
659 
660 	list_for_each_entry(jack_kctl, &jack->kctl_list, list)
661 		if (jack_kctl->sw_inject_enable)
662 			mask_bits |= jack_kctl->mask_bits;
663 		else
664 			snd_kctl_jack_report(jack->card, jack_kctl->kctl,
665 					     status & jack_kctl->mask_bits);
666 
667 #ifdef CONFIG_SND_JACK_INPUT_DEV
668 	idev = input_get_device(jack->input_dev);
669 	if (!idev)
670 		return;
671 
672 	for (i = 0; i < ARRAY_SIZE(jack->key); i++) {
673 		int testbit = ((SND_JACK_BTN_0 >> i) & ~mask_bits);
674 
675 		if (jack->type & testbit)
676 			input_report_key(idev, jack->key[i],
677 					 status & testbit);
678 	}
679 
680 	for (i = 0; i < ARRAY_SIZE(jack_switch_types); i++) {
681 		int testbit = ((1 << i) & ~mask_bits);
682 
683 		if (jack->type & testbit)
684 			input_report_switch(idev,
685 					    jack_switch_types[i],
686 					    status & testbit);
687 	}
688 
689 	input_sync(idev);
690 	input_put_device(idev);
691 #endif /* CONFIG_SND_JACK_INPUT_DEV */
692 }
693 EXPORT_SYMBOL(snd_jack_report);
694