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

source code of linux/sound/core/jack.c